TG2.2 - Ultimate limit state models

Task Group 2.2 was established to evaluate and develop models for the conception, design and analysis of concrete structures. Topics within the scope of the work may include models that deal with the ultimate limit state and with ductility as to their affect on peak and post peak behaviours.

The objective of TG2.2 is to synthesise available results from research, testing and design experience. Therefore, research and development in this field is monitored, documented and evaluated. For the time being, the work is focused on the behaviour of slabs and beams in shear, shear aspects in the design of members reinforced with steel bars, steel fibres or a combination of steel fibres and bars and the punching behaviour of slabs. Moreover, strut-and-tie modelling is treated as a specific method to capture ultimate limit states.

Convener
João Tiago Simões

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• WP2.2.1
• WP2.2.2
• WP2.2.3
• WP2.2.4

WP2.2.1 - Shear in beams

 

WP2.2.1 will prepare a bulletin about shear design and analysis models for beams (physical basis and experimental validation). Several aspects are considered to be treated in the report, including the influence of the member size or of point loads near supports, clear definitions of failure modes, strut-and-tie modelling or nonlinear calculation procedures.

 

Convener
Yuguang Yang

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First name	Last name	Country	Affiliation
Walraven	Joost	Netherlands	Dutch fib Delegation
Bayrak	Oguzhan	United States	Univ. of Texas at Austin
Belletti	Beatrice	Italy	Univ. degli Studi di Parma - Engineering and Architecture
Hegger	Josef	Germany	RWTH Aachen
Vollum	Robert	United Kingdom	Imperial College London
Fernández Ruiz	Miguel	Spain	Universidad Politécnica de Madrid
Kaufmann	Walter	Switzerland	ETH Zürich
Fernández-Ordóñez	David	Switzerland	fib
Sigrist	Viktor	Switzerland	vis Engineering
Muttoni	Aurelio	Switzerland	École polytechnique fédérale de Lausanne (EPF Lausanne)
Cladera Bohigas	Antoni	Spain	University of Balearic Islands
Huber	Patrick	Austria	Vienna University of Technology
Hrynyk	Trevor	United States	University of Waterloo
Foster	Stephen	Australia	UNSW Sydney
Hong	Sung-Gul	Korea, Republic of	Seoul National University
Mihaylov	Boyan	Belgium	University of Liege
Sagaseta	Juan	United Kingdom	University of Surrey
Uzel	Almila	Turkey	Yeditepe University
Bentz	Evan	Canada	University of Toronto
Yang	Yuguang	Netherlands	TU Delft

WP2.2.2 - Shear in members with steel fibres

 

WP2.2.2 will invite further experts to participate.

Convener
Marco di Prisco

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First name	Last name	Country	Affiliation
Minelli	Fausto	Italy	University of Brescia
Fernández-Ordóñez	David	Switzerland	fib
Foster	Stephen	Australia	UNSW Sydney
di Prisco	Marco	Italy	Politecnico di Milano

WP2.2.3 - Punching and shear in slabs

 

WP2.2.3 will invite further experts to participate.

Convener
João Tiago Simões

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First name	Last name	Country	Affiliation
Orlando	Maurizio	Italy	Università degli Studi di Firenze
Rombach	Günter	Germany	Techn. Univ. of Hamburg-Harburg
Ramos	António	Portugal	NOVA School of Science &Technology
Halvonik	Jaroslav	Slovakia	Slovak University of Technology in Bratislava
Hueste	Mary Beth	United States	Texas A&M University
Kueres	Dominik	Germany	RWTH Aachen University
Walkner	Rupert	Austria	University of Innsbruck
Parra-Montesinos	Gustavo	United States	University of Michigan
Melo	Guilherme	Brazil	Universidade de Brasilia
Walraven	Joost	Netherlands	Dutch fib Delegation
Bayrak	Oguzhan	United States	Univ. of Texas at Austin
Hegger	Josef	Germany	RWTH Aachen
Vollum	Robert	United Kingdom	Imperial College London
Fernández Ruiz	Miguel	Spain	Universidad Politécnica de Madrid
Laaksonen	Anssi	Finland	Tampere University of Technology
Ospina	Carlos	United States	Moffatt & Nichol
Vill	Markus	Austria	Vill ZT GmbH
Fernández-Ordóñez	David	Switzerland	fib
Hallgren	Mikael	Sweden	Tyréns Sverige AB
Feix	Jürgen	Austria	University of Innsbruck
Muttoni	Aurelio	Switzerland	École polytechnique fédérale de Lausanne (EPF Lausanne)
Hoang	Linh	Denmark	Danmarks Tekniske Universitet
Sagaseta	Juan	United Kingdom	University of Surrey
Park	Hong-Gun	Korea, Republic of	Seoul National University
Polak	Maria	Canada	University of Waterloo
Yang	Yuguang	Netherlands	TU Delft
Simões	João Tiago	Switzerland

WP2.2.4 - Strut and tie modelling

 

WP2.2.4 will address topics such as ordinary and more refined models, the level of approximation concept, an update of the MC2010 provisions, reversal loading and 3D models.

Convener
Lourenço, Miguel Filipe Passos Sério

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First name	Last name	Country	Affiliation
Almeida	João	Portugal	Instituto Superior Técnico Lisboa
Fernández Ruiz	Miguel	Spain	Universidad Politécnica de Madrid
Bousias	Stathis	Greece
Fernández-Ordóñez	David	Switzerland	fib
Mata-Falcón	Jaime	Spain	Universitat Politècnica de València
Lourenço	Miguel	Portugal	JSJ Structural Engineering
Mihaylov	Boyan	Belgium	University of Liege
Hoang	Linh	Denmark	Danmarks Tekniske Universitet
Meléndez	Carlos	Spain	Esteyco SA
Faria	Duarte	Switzerland	Muttoni et Fernández, ingénieurs conseils SA
Pedrosa Ferreira	Miguel	Portugal
Muttoni	Aurelio	Switzerland	École polytechnique fédérale de Lausanne (EPF Lausanne)

TG2.3 - Fire design of concrete structures

Task Group 2.3 welcomes active members with expertise in theory and practice in relation to fire design of concrete structures. The scope of TG2.3 comprises a discussion of theoretical and practical problems in relation to fire design and the development of the state-of-the-art and best practices for fire design of concrete structures. It is the goal that the results of the task group will not only serve as a reference for the experts within the topic of fire design, but also will be helpful for the members of the fib in general.

The scope of the work of TG2.3 is based on the previous achievements, which include Bulletins 38 and 46 on fire design of concrete structures: materials, modelling, structural behaviour and assessment, as well as contributions to the fib Model Code and various workshops and special sessions on these topics.

In the next phase, TG2.3 will concentrate on a number of topical issues within fire design, with the objective of providing general engineering guidance within these fields. The work is organised in three working parties, with the following titles and scope.

Convener
Ruben Van Coile

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• WP2.3.1
• WP2.3.2
• WP2.3.3
• WP2.3.4

WP2.3.1 - Spalling design

 

The aim of WP2.3.1 is to prepare a technical report providing guidance on the structural fire engineering design for concrete structures with a high probability and/or sensitive to the occurrence of concrete spalling during or after a fire.

Convener
Cristian Maluk

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First name	Last name	Country	Affiliation
Felicetti	Roberto	Italy	Politecnico di Milano
Fernández-Ordóñez	David	Switzerland	fib
Rodrigues	João	Portugal	University of Coimbra - Polo II
Lakhani	Hitesh	Germany	University of Stuttgart
Maluk	Cristian	United Kingdom
Phan	Long	United States	NIST

WP2.3.2 - Performance-based fire design

 

The aim of WP2.3.2 is to summarise, in a technical report, the international state-of-the-art and to discuss it specifically in relation to concrete structures, with the aim of achieving a proposal for its practical application.

Convener
Thomas Gernay

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First name	Last name	Country	Affiliation
Franssen	Jean Marc	Belgium	Université de Liège
Fernández-Ordóñez	David	Switzerland	fib
Gernay	Thomas	United States	Johns Hopkins University
Bamonte	Patrick	Italy	Politecnico di Milano
Lakhani	Hitesh	Germany	University of Stuttgart
Maluk	Cristian	United Kingdom
Elhami Khorasani	Negar	United States	University at Buffalo
Naser	M.Z.	United States	Clemson University
Rodrigues	João	Portugal	University of Coimbra - Polo II
Van Coile	Ruben	Belgium	Ghent University
Achenbach	Marcus	Germany	LGA KdöR
Roosefid	Mohsen	France	IRSN

WP2.3.3 - Fire resistance of concrete tunnels

 

The aim of WP2.3.3 is to prepare a technical report concerning structural engineering aspects of fire in tunnels. The main topics to be discussed are the design of concrete tunnels exposed to fire, fire scenario for different tunnels, material for concrete tunnels and design supported by testing.

 

Convener
Patrick Balmonte

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First name	Last name	Country	Affiliation
Bamonte	Patrick	Italy	Politecnico di Milano
Hänsel	Frederik	Germany
Kalaba	Nataša	France	Cerib
Lo Monte	Francesco	Italy	Politecnico di Milano
Michelini	Elena	Italy	University of Parma
Stucchi	Riccardo	Switzerland	Lombardi SA
Fernández-Ordóñez	David	Switzerland	fib

WP2.3.4 - Post-fire assessment

 

The aim of WP2.3.4 is to prepare a technical report the post fire assessment of concrete structures, summarizing the international state-of-the-art and providing actionable guidance on the evaluation of concrete structures following fire exposure.

Convener
Ruben Van Coile

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First name	Last name	Country	Affiliation
Van Coile	Ruben	Belgium	Ghent University
Felicetti	Roberto	Italy	Politecnico di Milano
Gernay	Thomas	United States	Johns Hopkins University
Kodur	Venkatesh	United States	Michigan State University
Lakhani	Hitesh	Germany	University of Stuttgart
Molkens	Tom	Belgium	KU Leuven
Rodrigues	João	Portugal	University of Coimbra - Polo II
Agrawal	Ankit	United States	Integral Research Solutions Group
Fernández-Ordóñez	David	Switzerland	fib
Maluk	Cristian	United Kingdom

TG2.4 - Computer-based modelling and design

Task Group 2.4 (TG2.4) aims to bridge the gap between complex and advanced analyses and practical design applications. The current state of knowledge on nonlinear methods, thermomechanical analyses as well as the application of holistic 3D building models will be prepared for practical use.

The scope and objectives of TG2.4 are to:

• survey the current state of knowledge on computer-based modelling and design;
• develop guidance documents related to the application of non-linear computer-based analysis methods for assessing performance and aiding the design of concrete members;
• develop guidance documents related to the application of thermomechanical computer-based analysis methods for assessing the cracking risk respectively the mode of cracking and the required minimum reinforcement due to imposed and restrained deformations;
• establish frameworks and methods to incorporate the application of holistic 3D building models in the static analysis and design in practice;
• provide guidance on the application of computational modelling procedures to post-construction assessments, forensic engineering, and rehabilitation work relating to existing concrete structures.

Moreover, the Task Group 2.4 shall become a platform for researchers and practical users to:

• propose criteria for calibrating or validating computer-based procedures employed for concrete structure design or assessment;
• discuss the extension of computer-based modelling procedures to structures employing high performance concretes, fibre-reinforced concretes, and composite concrete structures;
• work toward integrating computer-based analysis-related provisions within the Model Code.

Convener
Dirk Schlicke

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• WP2.4.1
• WP2.4.2

WP2.4.1 - Modelling of Fibre Reinforced Concrete Structures

 

Discrete fibres are being added to cement based materials (Fibre reinforced concrete, FRC) in order to increase the post-cracking residual strength of concrete structures. The fibre reinforcement mechanisms are mainly activated after crack initiation of the binder paste, so modelling the behaviour of FRC requires numerical approaches able of simulating the crack initiation and crack propagation in cement based materials. However, the designers that have the responsibility to design FRC structures face several challenges for selecting the most appropriate constitutive model, such is the case when intended to use sophisticated computer programs based on the finite element method (FEM). The values of the parameters of the constitutive models, and how to assure that these values are representative of the behaviour of the real structure are key aspects that designers face.

The main aim of this WG is to propose reliable methodologies for the application of FEM-based computer models for the design of FRC structures by considering their serviceability and ultimate limit state exigencies.

Convener
Joaquim A. O. Barros

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First name	Last name	Country	Affiliation
A. O. Barros	Joaquim	Portugal	Universidade do Minho
Fernández-Ordóñez	David	Switzerland	fib
van den bos	ab	Netherlands	NLyse
Carpinteri	Alberto	Italy	Politecnico di Torino
Fantilli	Alessandro	Italy	Politecnico di Torino
Sanz	Beatriz	Spain	Technical University of Madrid
GAL	Erez	Israel	Ben-Gurion University of the Negev
Vecchio	Frank	Canada	University of Toronto
Cervenka	Jan	Czech Republic	Cervenka Consulting Ltd
Ferrara	Liberato	Italy	Politecnico di Milano
Rossi	Pierre	Brazil
Caggiano	Antonio	Germany	Univ. of Buenos Aires/Univ. of Darmstadt
Dias-da-Costa	Daniel	Australia	The Univ. of Sydney
Cendon	David	Spain	Universidad Politécnica de Madrid
Poveda Bautista	Elisa	Spain	University of Castilla-La Mancha
Schlangen	Erik	Netherlands	Delft University of Technology
Neu	Gerrit	Germany	Ruhr University Bochum
Meschke	Gunther	Germany	Ruhr University Bochum
Planas	Jaime	Spain	Technical University of Madrid
Juhasz	Peter	Hungary	JKP Static - Budapest
Cremonesi	Massimiliano	Italy	Politecnico di Milano
Özyurt Zihnioğlu	Nilüfer	Turkey	Boğaziçi University
Kabele	Petr	Czech Republic	Czech Technical University in Prague
Yu	Rena C.	Spain	University of Castilla-La Mancha
Chasioti	Stamatina	Canada	Yorku University
Gouveia	Ventura	Portugal	Polytechnic Institute of Viseu
Cunha	Vitor	Portugal	University of Minho
Chi	Yin	China	Wuhan University
Matos	Luis	Portugal	University of Minho
Accornero	Federico	China

WP2.4.2 - Life-span numerical simulation of concrete structures

 

Accurate prediction of the durability and long-term performance of concrete structures is a challenging task due to numerous influencing factors involved and their complex combinations. Despite these complexities, the majority of current standard specifications deal with the durability of concrete on the basis of a rather simple, prescriptive approach, where a set of requirements are usually applied to at the design stage and serve mainly as the basis of quality control. The durability and long-term performance of concrete structures are also essential for evaluating sustainability aspects such as the life-cycle emissions of carbon dioxide (CO2). Therefore, we should be able to accurately predict the service life of a structure for given materials and processes. To improve our capability to predict the service life of concrete structures, we intend to use a multi-scale approach taking into account the time-dependent properties of concrete, externally applied loads and exposure environments in a holistic manner. To this end, such analysis models and simulation frameworks are still under development, and we aim to showcase its applicability, calculation procedures, required parameters, and appropriate ways of interpreting the simulation results.

The main scope of WP 2.4.2 is developing accurate and reliable models and simulation frameworks for life-span numerical simulation of concrete structures. The primary objective of the activity is to couple material and structural behaviors with their durability and sustainability. The developed numerical models should cover mechanical behaviors, durability issues, and sustainability aspects such as CO2 emissions.

Convener
Tetsuya Ishida

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First name	Last name	Country	Affiliation
Ishida	Tetsuya	Japan	Department of Civil Engineering
Fernández-Ordóñez	David	Switzerland	fib
Ohno	Motohiro	Japan	The University of Tokyo
Benboudjema	Farid	France	ENS Paris-Saclay, Université Paris-Saclay
Bishnoi	Shashank	India	Indian Institute of Technology Delhi
Dai	Jie	China	Henan University of Technology
Gong	Fuyuan	China	Zhejiang University
Suryanto	B.	United Kingdom	Heriot-Watt University Edinburgh
Azenha	Miguel	Portugal	Civil UMinho - Universidade do Minho
Li	Kefei	China
Rasul	Mehboob	Japan	Technology Development Division

TG2.5 - Bond and material models

The overall motivation of TG2.5 is to advance theoretical and practical developments in topics related to bond and anchorage of reinforcing and prestressing materials, and to present these developments in an understandable and code-type formulated manner.

TG2.5 undertakes activities which stimulate and advance modelling of the influence of bond and anchorage of reinforcement on structural performance, as well as the development of design provisions related to bond behaviour and detailing of laps and anchorages.

Convener
Giovanni A. Plizzari

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TG2.6 - Composite steel-concrete construction

Steel-concrete composite construction allows various structural solutions that optimize the performances of the two-component materials through a well-assessed design that takes into account all the particularities of steel and RC constructions as well as interaction problems.

The use of composite construction is widely spread all around the world, and its use for the construction of medium-sized bridges is a very frequent technical choice. In this historical period, the concrete industry must take this into account.

The motivation of the fib TG2.6 is to identify the meaningful characteristics of composite steel- concrete structures with respect to typical aspects of RC structures in order to provide technical knowledge and design provisions.

The activity of the group is focused on the analyses of the structural behaviour of RC parts constituting steel-concrete composite members and the modeling of their interaction with the steel parts.

Convener
Maria Rosaria Pecce

Co-Convener
Antonio Bilotta

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TG2.7 - Seismic Design

The motivation for the work of Task Group 2.7 (TG2.7) is the promotion of the use and improvement in safety of concrete structures under accidental (e.g. seismic) actions and/or in exposed regions worldwide.

Convener
Paolo Franchin

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TG2.8 - Safety and performance concepts

The overall motivation of Task Group 2.8 (TG2.8) is based on the fact that structural systems are typically designed to stay in service for at least several decades. This implies that proper attention must be given to structural performance under various actions, both man-made and environmental, to the methodology of structural analysis and assessment, to material properties, to the inverse identification and monitoring of structural resistance among others. The main focus is the development of a holistic performance based design approach for new and existing structures and infrastructures.

The objective of TG2.8 is to promote and to provide on the basis of the guide to good practice “safety and performance concepts – reliability assessment of concrete structures” the theoretical and practical developments for the performance based design. This includes structural safety, serviceability and reliability, advanced methodology including probabilistic methods, inverse analyses techniques, monitoring methods, and performance and optimised life-cycle cost based design concepts.

Convener
Konrad Berg-meister

Co-convener
Luc Taerwe

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TG2.9 - Fastenings to structural concrete and masonry

The modern fastening technique is employed extensively for the transfer of concentrated loads into concrete and masonry structures. Cast-in-place anchors, placed in the formwork before casting of the concrete, as well as post-installed anchors and reinforcing bars, which are installed in hardened structural concrete or masonry, are equally common. Loads are transferred into the concrete or masonry by mechanical interlock, friction, bond or a combination of these mechanisms. However, independently of the load-transfer mechanism, all anchorages rely on the tensile strength of the concrete or masonry, a fact which must be taken into account in both assessment and design. Despite the widespread use of cast-in-place as well as post-installed anchors and reinforcing bars in construction, the overall level of understanding in the engineering community regarding their behaviour remains quite limited.

In order to improve the general state of knowledge in this field, Task Group 2.9 “Fastenings to Structural Concrete and Masonry” (former Special Activity Group 4) was formed.

The aim of TG2.9 is to collect and discuss the latest research results in the field of fastening technology, to identify new areas of research and to synthesise the research results in harmonised provisions for the design of fastenings.

Convener
Akanshu Sharma

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• WP2.9.1
• WP2.9.2
• WP2.9.3
• WP2.9.4
• WP2.9.5
• WP2.9.6
• WP2.9.7
• WP2.9.8
• WP2.9.9
• WP2.9.10
• WP2.9.11
• WP2.9.12

WP2.9.1 - Review of current fib model with a view to MC2010 and model for anchor reinforcement

 

Revision of the design model for anchorage reinforcement taking into account bond provisions of the fib MC 2010.

Convener
Akanshu Sharma

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First name	Last name	Country	Affiliation
Sharma	Akanshu	United States	Purdue University
Asmus	Jörg	Germany	IEA GmbH & Co. KG
Hofmann	Jan	Germany	IWB, Universität Stuttgart
Silva	John	United States	Hilti Inc.
Fernández-Ordóñez	David	Switzerland	fib
Eligehausen	Rolf	Germany	IWB, Universität Stuttgart
Elfgren	Lennart	Sweden	Luleå University of Technology
Sippel	Thomas	Finland	Peikko Group Corp.
Adediran	Adeola	United States	Bechtel
Umminger	Martin	Germany	Adolf Würth GmbH & Co. KG

WP2.9.2 - Open topics in the current design guide

 

Review of the design provisions for anchorages in respect to inconsistencies and new research results and development of improved design provisions.

Convener
Jürgen Stork

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First name	Last name	Country	Affiliation
Mallee	Rainer	Germany
Wendt	Andreas	United States	Simpson Strong Tie Company, Inc.
Pregartner	Thilo	Germany	fischerwerke GmbH & Co. KG
Stork	Jürgen	Germany	Consultant
Buhler	Jochen	Germany	Adolf Würth GmbH & Co KG
Wall	Friedrich	Liechtenstein	Hilti AG
Li	Longfei	Germany	Dr. Li Anchor Profi GmbH
Fernández-Ordóñez	David	Switzerland	fib
Sharma	Akanshu	United States	Purdue University
Tóth	Máté	Germany	fischerwerke GmbH & Co. KG
Bokor	Boglárka	Liechtenstein	Hilti Corporation
Umminger	Martin	Germany	Adolf Würth GmbH & Co. KG

WP2.9.3 - Shear lugs

 

Development of provisions for the design of shear lugs. A proposal for designing fastenings with shear lugs has been accepted by TG2.9 and will be incorporated in the new edition of the fib design guide.

Convener
Ronald Cook

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First name	Last name	Country	Affiliation
Michler	Harald	Germany	Technische Universität Dresden
Stork	Jürgen	Germany	Consultant
Silva	John	United States	Hilti Inc.
Cook	Ronald	United States	University of Florida
Fernández-Ordóñez	David	Switzerland	fib
Eligehausen	Rolf	Germany	IWB, Universität Stuttgart

WP2.9.4 - Fatigue loading

 

Review of the existing simplified design provisions for anchorages under fatigue loading and development of less conservative design provisions.

Convener
Dieter Lotze

Co-convener
Mate Toth

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First name	Last name	Country	Affiliation
Lotze	Dieter	Germany	Universität Stuttgart, Materialprüfungsanstalt Otto-Graf-Institut
Block	Klaus	Germany	fobatec GmbH
Hofmann	Jan	Germany	IWB, Universität Stuttgart
Wall	Friedrich	Liechtenstein	Hilti AG
Li	Longfei	Germany	Dr. Li Anchor Profi GmbH
Fernández-Ordóñez	David	Switzerland	fib
Tóth	Máté	Germany	fischerwerke GmbH & Co. KG
Sippel	Thomas	Finland	Peikko Group Corp.
Fröhlich	Thilo	Germany	University of Stuttgart, Materials Testing Institute (Otto-Graf-Institut)
Eligehausen	Rolf	Germany	IWB, Universität Stuttgart
Pregartner	Thilo	Germany	fischerwerke GmbH & Co. KG

WP2.9.5 - Bonded anchors under sustained load

 

Review of research results on bonded anchors under sustained load and development of provisions for the design of anchorages with bonded anchors and connections with post-installed reinforcement to take into account the negative influence of sustained load. A proposal for design provisions has been accepted by TG2.9 and will be incorporated in the fib design guide.

Convener
Jan Hofmann

Convener
Ronald Cook

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First name	Last name	Country	Affiliation
Guillet	Thierry	France	CSTB
Hofmann	Jan	Germany	IWB, Universität Stuttgart
Schätzle	Joachim	Germany	Fischerwerke GmbH & Co. KG
Wall	Friedrich	Liechtenstein	Hilti AG
Cook	Ronald	United States	University of Florida
Fernández-Ordóñez	David	Switzerland	fib
Eligehausen	Rolf	Germany	IWB, Universität Stuttgart
Al-Mansouri	Omar	France	HILTI

WP2.9.6 - Post-installed reinforcement – Harmonisation of rules for reinforced concrete and anchorages with bonded anchors and post-installed reinforcement

 

Development of a harmonised design concept for connections with bonded anchors and postinstalled reinforcement under static and seismic loading.

Convener
John F. Silva

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First name	Last name	Country	Affiliation
Sharma	Akanshu	United States	Purdue University
Silva	John	United States	Hilti Inc.
Fernández-Ordóñez	David	Switzerland	fib
Eligehausen	Rolf	Germany	IWB, Universität Stuttgart
Mahrenholtz	Christoph	Germany	Jordahl GmbH

WP2.9.7 - Splitting of bonded anchors

 

Development of design provision for bonded anchors to prevent splitting of the concrete member during pretensioning and loading which shall replace the currently required approval tests.

Convener
Jörg Asmus

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First name	Last name	Country	Affiliation
Asmus	Jörg	Germany	IEA GmbH & Co. KG
Guillet	Thierry	France	CSTB
Cook	Ronald	United States	University of Florida
Fernández-Ordóñez	David	Switzerland	fib
Kummerow	Andreas	Germany	Deutsches Institut für Bautechnik
Al-Mansouri	Omar	France	HILTI

WP2.9.8 - Required stiffness of baseplates

 

In general, anchorages are designed under the assumption that the baseplate is stiff. However, no criteria are given in the fib Design Guide to assure a stiff baseplate. These provisions are under development. Furthermore, design rules for fastenings with flexible base plates are being discussed.

Convener
Giovanni Muciaccia

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First name	Last name	Country	Affiliation
Stork	Jürgen	Germany	Consultant
Wall	Friedrich	Liechtenstein	Hilti AG
Cook	Ronald	United States	University of Florida
Li	Longfei	Germany	Dr. Li Anchor Profi GmbH
Fernández-Ordóñez	David	Switzerland	fib
Eligehausen	Rolf	Germany	IWB, Universität Stuttgart
Sharma	Akanshu	United States	Purdue University
Gerber	Brian	United States	IAPMO
Lotze	Dieter	Germany	Universität Stuttgart, Materialprüfungsanstalt Otto-Graf-Institut
Muciaccia	Giovanni	Italy	Politecnico di Milano
Pregartner	Thilo	Germany	fischerwerke GmbH & Co. KG
Zhu	Feng	Germany	Fischerwerke GmbH & Co. KG
Wittstock	Beatrix	Germany	Deutsches Institut für Bautechnik
Silva	John	United States	Hilti Inc.
Herve	Clement	France	EDF
Asmus	Jörg	Germany	IEA GmbH & Co. KG
Al-Mansouri	Omar	France	HILTI
Mallee	Rainer	Germany
Bokor	Boglárka	Liechtenstein	Hilti Corporation
Umminger	Martin	Germany	Adolf Würth GmbH & Co. KG

WP2.9.9 - Fire Resistance of anchors and post-installed reinforcement

 

Development of more refined provisions for the design of anchorages with all types of anchors and of connections with post-installed reinforcement under fire exposure. A proposal for the design of fastenings with post-installed reinforcement under fire exposure has been accepted by TG2.9. These will be incorporated in the fib design guide.

Convener
Thierry Guillet

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First name	Last name	Country	Affiliation
Stochlia	Kurt	United States	ICC Evaluation Service
Pimienta	Pierre	France	CSTB - Centre Scien. et Techn. du Bâtiment
Lange	Gerhard	Germany	Deutsches Institut für Bautechnik
Pinoteau	Nicolas	France	CSTB
Guillet	Thierry	France	CSTB
Hofmann	Jan	Germany	IWB, Universität Stuttgart
Silva	John	United States	Hilti Inc.
Fernández-Ordóñez	David	Switzerland	fib
Takahashi	Muneomi	Japan	Hilti Japan
Eligehausen	Rolf	Germany	IWB, Universität Stuttgart
Sharma	Akanshu	United States	Purdue University
Al-Mansouri	Omar	France	HILTI

WP2.9.10 - Evaluation and assessment of existing anchorages

 

Development of provisions for evaluation and assessment of existing anchorages which are currently not available but urgently needed.

Convener
Lennart Elfgren

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First name	Last name	Country	Affiliation
Elfgren	Lennart	Sweden	Luleå University of Technology
Muciaccia	Giovanni	Italy	Politecnico di Milano
Li	Longfei	Germany	Dr. Li Anchor Profi GmbH
Sharma	Akanshu	United States	Purdue University
Fernández-Ordóñez	David	Switzerland	fib
Asmus	Jörg	Germany	IEA GmbH & Co. KG
Eligehausen	Rolf	Germany	IWB, Universität Stuttgart
Matsuzaki	Yasuhiro	Japan	Science University of Tokyo
Nilforoush	Rasoul	Sweden	Luleå University of Technology
Silva	John	United States	Hilti Inc.
Al-Mansouri	Omar	France	HILTI
Guillet	Thierry	France	CSTB
Umminger	Martin	Germany	Adolf Würth GmbH & Co. KG

WP2.9.11 - Steel shear strength of anchorages with stand-off base plate connection

 

Development of provisions to calculate the design steel shear strength of anchorages with stand-off base plate connections. Design provisions proposed by WP have been accepted by TG2.9 and will be incorporated in the fib design guide.

Convener
Ronald Cook

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First name	Last name	Country	Affiliation
Muciaccia	Giovanni	Italy	Politecnico di Milano
Hofmann	Jan	Germany	IWB, Universität Stuttgart
Silva	John	United States	Hilti Inc.
Cook	Ronald	United States	University of Florida
Fernández-Ordóñez	David	Switzerland	fib
Eligehausen	Rolf	Germany	IWB, Universität Stuttgart

WP2.9.12 - Seismic Design

 

Development of provisions for seismic design of anchorages.

Convener
Giovanni Muciaccia

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First name	Last name	Country	Affiliation
Muciaccia	Giovanni	Italy	Politecnico di Milano
Sharma	Akanshu	United States	Purdue University
Fernández-Ordóñez	David	Switzerland	fib
Al-Mansouri	Omar	France	HILTI
Sippel	Thomas	Finland	Peikko Group Corp.
Umminger	Martin	Germany	Adolf Würth GmbH & Co. KG
Calvi	Paolo Martino	United States

TG2.10 - Textile reinforced concrete construction and design

New material composites such as concrete with non-metallic reinforcement have been intensively developed during the past 25 years. Usually, the composite material consists of concrete with a reduced maximum grain size and endless fiber-based textile or bar-shaped reinforcementstructures instead of classical steel reinforcement. Fibers made of carbon, alkali-resistant glass, or basalt (and similar) are currently the most suitable for use in structural concrete. Their resistance to corrosion and their high tensile bearing behavior and stiffness allows a clear reduction of concrete cover thickness and freedom of form in comparison to classical steel-reinforced concrete.

These developments offer new ways in concrete construction due to the possibility for curved, thinner and more filigree construction components. This might be a starting point for several new research works. And there is a need for recommendations or guidelines that secure and facilitate the use of the new material. Therefore, the work of a task group is considered meaningful.

The task group may contribute to working out rules and compiling guidelines for the design of(a) new constructions and (b) of strengthening, retrofitting and repair measures made of concrete with non-metallic reinforcement. The focus will be on grid-like (textile) endless-fiberbased reinforcement materials, as this is where the greatest differences lie compared to construction using reinforcing steel. Rod-shaped reinforcements are not considered for now. Due to the wide range of possible fiber materials, focusing is necessary. In any case, carbon and AR glass fibers will be a key focus. However, which types of fibers are particularly relevant depends heavily on local conditions and will be discussed in the group of experts. Basic principles can usually be applied to other fiber types as well.

Convener
Silke Scheerer

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TG2.11 - Structures made by digital fabrication

Digital fabrication processes for fabricating concrete-like products, objects and/or structures are typically grouped into three main categories: (i) Layered Extrusion (e.g. contour crafting, concrete printing etc.), (ii) Binder Jetting (e.g. D-shape), (iii) Slip-forming (e.g. smart dynamic casting). However, to date, many important developments have been accomplished for layered extrusion technology, consisting of a digitally controlled moving printing head (or nozzle) that precisely lays down the concrete or mortar material layer-by-layer.

It is clear that the full understanding of the structural performances of digitally fabricated elements represents noteworthy progress in supporting the design of such innovative structures. In this way, reliable structural concepts and assessment methodologies could be integrated within existing international building codes/standards and adapted to the particularities of DFC, providing effective recommendations to the construction industry stakeholders.

The primary objective of the task group is to identify limiting aspects of the current design practice for the implementation of novel, digitally-fabricated concrete structures. Based on that, the task group will address fundamental structural issues related to the particularities of DFC with the final aim of providing effective guidelines for code-compliant applications.

Convener
Costantino Menna

Co-Convener
Domenico Asprone

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TG2.12 - Protective Concrete Structures against Hazards

Concrete structures are suitable for the development and construction of protective structures against several kinds of hazards, like a blast, missiles, impact or thermal loads. The reasons for such extreme loadings may be different, but the structures under consideration have to provide conditions for safe and relatively comfortable survival of people inside. The TG2.12 will develop documents which specify the conditions of performance of protective structures and conditions for their design.

Convener
Klaas Van Breugel

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• WP2.12.1

WP2.12.1 Design of structures subjected to impact and explosion

 

Concrete structures can be subjected to variable actions inducing very high strain rates, generated by several kinds of hazards, like blast, missiles or fragments, impact, in normal conditions or fire. The reasons for such extreme loadings may be different, but the structures investigated have to provide conditions for safe and relatively comfortable survival of people and equipment inside.

 

According to the TG 2.12 activity, the action group AG12 has rewritten the chapter 30.2.3 on Impact and Explosion. The synthesis introduced in the Model Code requires a background document able to explain the change introduced in relation to Model Code 2010.

 

The members of the Working Party have prepared a first draft of a bulletin aimed at introducing the background knowledge that explains the main novelties introduced in the indicated chapter. The idea is to discuss the document together with the interested people of the TG 2.12 in order to give the designers who are called to design protective structures a modern and a reliable basic tool.

Convener
Marco Di Prisco

Co-Convener
Ezio Cadoni

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First name	Last name	Country	Affiliation
di Prisco	Marco	Italy	Politecnico di Milano
Fernández-Ordóñez	David	Switzerland	fib
Pérez Caldentey	Alejandro	Spain	FHECOR Ingenieros Consultores/Universidad Politécnica de Madrid
Dancygier	Avraham	Israel	Technion-Israel Institute of Technology
Weerheijm	Jaap	Netherlands	TU Delft
Colombo	Matteo	Italy	Politecnico di Milano
SHU	JIANGPENG	Norway	Norwegian University of Science and Technology
Banthia	Nemkumar	Canada	Univ. of British Columbia
Kanstad	Terje	Norway	The Norwegian Univ.of Science & Tech
Dieteren	Gerrie	Netherlands	TNO
van Breugel	Klaas	Netherlands	Delft Univ. of Technology
Keuser	Manfred	Germany	BUNG Ingenieure A
Toutlemonde	François	France	Université Gustave Eiffel
Johansson	Kim	Finland	Concrete Assoc. of Finland
Mechtcherine	Viktor	Germany	Technical Univ. Dresden
Curbach	Manfred	Germany	Technische Univ. Dresden
Mobasher	Barzin	United States	Arizona State University
Cadoni	Ezio	Switzerland	DynaMat SUPSI Laboratory

TG2.13 - Design and assessment for tsunami loading

The primary objective of the task group (TG) is to identify methodologies for: (i) the design of tsunami resistant structures/infrastructure, (ii) the assessment of existing assets against tsunami-induced loads and (iii) the design/assessment of existing assets towards the sequential hazards such as earthquakes and tsunami, or other triggering hazards. Assets under investigation include RC, masonry, steel and composite structures and infrastructure.

The TG plans to face structural issues by focusing on the structural response of reinforced concrete structures and infrastructure under tsunami loading, with main focus on:

• The definition and estimation of loads (i.e., hydrostatic and hydrodynamic horizontal and vertical loads induced by a tsunami, such as buoyancy) acting on structural members for design/assessment of structures and infrastructure;
• The behaviour of non-structural components, such as infill walls;
• The structural analysis methodology for design/assessment;
• Performance levels and safety checks at local and global levels.

The fundamental knowledge produced in this framework will support the introduction of reliable design/assessment criteria in the field of tsunami engineering. This will provide an improvement with respect to existing international codes and will represent the first guideline for Europe.

The TG will also address aspects related to the harmonization of tsunami design provisions with existing design provisions for other kind of hazards.

Convener
Rossetto Tiziana

Co-Convener
Del Zoppo Marta

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TG2.14 - Open-source code development by the fib

The fib has started developing an open-source Python package containing models from the fib Model Code. Github is used as a platform for version control and code collaboration. On the long-term, this package should contain all models in the fib Model Code. When sufficiently mature, the package should be published on PyPI.org to arrange for easy distribution. The package should be published with a license that grants the user flexible rights to use, study, edit and publish the source code, without warranty of any kind.

Primary objective of the TG: serve as a team of core developers or maintainers of the Python package. This includes, but is not limited to:

• Contribute code to the package.
• Respond to issues that are reported and initiate relevant actions.
• Maintain a CI/CD, continuous integration and continuous delivery, pipeline.
• Review contributions from the community, and merge these when properly matured.

The fib seeks contributions from the fib and the engineering community as a whole.

Convener
Morten Engen

Co-Convener
Diego Alexandro Talledo

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TG2.15 - Bridges with combined reinforcement

Unbonded – external post-tensioning (PT) tendons are gaining interest world-wide within the concrete bridge community. The ability to address unforeseen issues has always been valued by bridge engineers and unbonded external PT tendons provide bridge designers and owners the flexibility to address these issues through their ability to be replaced while the bridge is in-service. Four countries, France, Germany, Japan, and United States are using this technology to provide tendon replaceability.

The use of unbonded tendons has led to components with both bonded and unbonded prestressing and/or mild reinforcement. Research has shown that the use of mixed reinforcement conditions (i.e. bonded and unbonded PT with and without mild reinforcement) in concrete members has structural implications (UF Report). Most current specifications consider their design approach as conservative for the design of components with mixed reinforcement conditions. However, research has shown that the performance and appropriate design of these members is complex and comprehensive guidance is needed to educate engineers on the design of these unique components. Therefore, there is a great need for clear design guidance to bridge designers on this unique and increasingly popular posttensioned component.

This guidance can have at least four purposes: i) provide background information on the performance of mixed reinforced elements with varying amounts of unbonded to bonded PT ratios, ii) synthesize current codified design methods for members with mixed reinforcement, iii) develop guidance on appropriate analysis methods, and iv) develop design approach for flexural capacity, including resistance factors & associated ductility requirements.

The primary objective of the task group (TG) is to serve as a team of core technical reviewers for the development of this technical report. Expertise in the design of complex concrete elements and experience with design methods for mixed reinforced members is desired.

Convener
John Corven

Co-Convener
Oguzhan Bayrak

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