Practical application of Eurocode 3 to multi-storey buildings with steel 'sway frame' structures

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Industrial research and development
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ISSN 1018-5593
European Commission
technical steel research
Properties and in-service performance
Practical application of Eurocode 3
to multi-storey buildings with steel
'sway frame' structures
STEEL RESEARCH European Commission
Properties and in-service performance
Practical application of Eurocode 3
to multi-storey buildings with steel
'sway frame' structures
E Fattorini, M. Bandini, F. Cattaneo, S. Pustorino
Centro Sviluppo Materiali
Via di Castel Romano, 100-102
1-00129 Rome
Contract No 7210-SA/419
1 July 1991 to 30 June 1995
Final report
Directorate-General
Science, Research and Development
1998 EUR 17879 EN LEGAL NOTICE
Neither the European Commission nor any person acting on behalf of the Commission
is responsible for the use which might be made of the following information.
A great deal of additional information on the European Union is available on the Internet.
It can be accessed through the Europa server (http://europa.eu.int).
Cataloguing data can be found at the end of this publication.
Luxembourg: Office for Official Publications of the European Communities, 1998
ISBN 92-828-2316-4
© European Communities, 1998
Reproduction is authorised provided the source is acknowledged.
Printed in Luxembourg
PRINTED ON WHITE CHLORINE-FREE PAPER FOREWORD
(1) The research activities described in this report were carried out with the financial
assistance of the European Coal and Steel Community (ECSC).
(2) Particular thanks for fruitful collaboration are addressed to :
• Mr. A.Bureau - Mr. B.Chabrolin CTICM (F)
ProfilARBED-Recherches (L) • Mr. P.Chantrain
University of Trento (I) • Prof. R.Zandonini
(3) Grateful thanks are also expressed to :
• Prof. E.Bozzo SIDERCAD (I)
University of Basilicata (I) • Prof. A.De Luca
• Prof. G.Macchi University of Pavia (I) y of Rome (I) • Prof. P.E.Pinto
• Mr. S.Pustorino CREA (I)
• Prof. H.Rubin TU (A)
RWTH (D) • Prof. G.Sedlacek Mr. D.Grotmann
• Mr. C.Taylor SCI (GB) PRACTICAL APPLICATION OF EUROCODE 3 TO
MULTI-STOREY BUILDINGS WITH STEEL "SWAY FRAME" STRUCTURES
E.C.S.C. contract number 7210-SA/419
Abstract
The present work deals with the analysis and verification, according to the
Eurocodes, of a particular class of steel structures known as "sway frames" in which the
nodal horizontal displacements produce non negligible additional internal moments (Ρ-Δ
effects) that have to be summed up to those deriving from a first order analysis.
In the design of these structures, the actions are determined in accordance with the
EC1; EC8 recommendations are used when the seismic effects have to be taken into
account.
The final result of this project is the draft of a practical design "handbook" for
structural engineers dealing with the design of steel "sway frame" structures according to
EC3. The contents of this document are the design calculation rules for this category of
structures. Besides, some indications are provided as to the use of popular general purpose
computer codes available in the European market for a reliable and efficient design of
"sway frame" systems. Finally, a number of calculation examples of 2D-frames have been
included.
From a practical point of view this research has evidenced that common types of steel
structures as industrial buildings, multi-storey parkings, warehouse buildings and small
civil buildings subject to usual vertical loads may fail to fulfil the "non sway" criterion and
thus have to be defined as "sway frames".
The results have shown that for asymmetrical plane frames the rules of the EC3 for
the simplified "sway-non sway" classification and for the indirect second order elastic
analysis methods have to be reconsidered in order to make then more clear and to improve
their level of accuracy. Further studies are needed to develop the background to simple yet
reliable design criteria.
In particular, the activities performed during this work were divided in six phases:
Phase 1: Study of the EC3, EC1, and EC8, with particular reference to frame design;
Phase 2: Study and comparison of some of the major national standards regarding steel
structures, with special attention to the clauses regarding "sway frame" analysis;
Phase 3: Identification of second and first order general purpose computer codes for
"sway frame" analysis; Phase 4: Selection of a number of buildings of interest, in an European context, for the
calculation examples. The calculation of these structural models according to EC3
methodologies and the subsequent member checks. Regarding these local checks, a link
with C.T.I.C.M.'s project SA/312 has been obtained performing a number of local
verifications with the code "EC3 Tools" developed during the research. Additional
calculations have been performed according to some of the National standards studied
during phase 2;
Phase 5: A conservative assessment of the results of the calculation examples performed
in phase 4. The features of the methods adopted in then phase have been
extensively illustrated.
Phase 6: The draft of a practical design handbook for civil engineers regarding the "sway
frame" elastic analysis and checks according to EC3. It contains detailed design procedures
for these structures and indications on the main characteristics of popular general purpose
computer codes. The general lines of this manual have been decided in collaboration with
the researchers of Profil ARBED Recherches working on project S A/513. The aim is to
obtain a link between the two works, taking into account that the two projects deal with
structures that belong to the "family" of the steel frames. INDEX
1 -INTRODUCTION 9
2 - EUROPEAN STANDARDS AND RECOMMENDATIONS 11
2.1 -EUROCODE 3 1
2.1.1 - Limit states and design situations (EC3 section 2.2) 1
2.1.2 - The Serviceability Limit States (SLS) 12
2.1.3 -The Ultimate Limit States (ULS)
2.1.4 - - The Connections5
2.2-EUROCODE7
2.3 -EUROCODE 8
2.3.1 -Part 1.1
2.3.2- Part 1.2 18
2.3.3-Part 1.3
2.4- ECCS PUBLICATION No.339
2.4.1 - Definitions 20
2.4.2 The analysis methods
3 - THE NATIONAL STANDARDS2
3.1 -GENERAL
3.2 - UNITED KINGDOM
3.2.1 - General
3.2.2 - "Sway-Non Sway" criterion 23
3.2.3 - Calculation methods for "sway frames"4
3.3-FRANCE 25
3.3.1 General
3.3.2 The "Additif 80"
3.4-ITALY6
3.4.1 General
3.4.2 "Sway-Non Sway" criterion
3.5-GERMANY7
3.5.1 - General
3.5.2 - "Sway-Non Sway" criteria 2
3.5.3 - Elastic analysis of "sway frames"8
3.6-SWITZERLAND 29
3.7-USA
3.8-JAPAN
6 3.9 - CONCLUDING REMARKS 30
4 - THE CALCULATIONS ACCORDING TO THE EUROCODES 31
4.1 INTRODUCTION
4.2 - THE OPERATIONAL PHASES2
4.2.1 - General
4.2.2 - Calculation assumptions3
4.2.3 - Beam-column connection design 34
5 - DESIGN CALCULATIONS ACCORDING TO THE NATIONAL
STANDARDS 35
5.1 -GENERAL
5.2 - UNITED KINGDOM
5.3-ITALY7
5.4-GERMANY
5.5 -FRANCE 38
6 - COLLABORATION BETWEEN PROJECTS SA/312, SA/419, SA/513 40
6.1 -GENERAL 4
6.2 - FLOW CHART FC 10
6.3 - COMPARISON BETWEEN A SWAY FRAME AND A NON SWA
FRAME
6.3.1 - General
6.3.2 - Results1
7 - CONCLUSIONS5
7.1 -GENERAL
7.2- EUROCODE 3 4
7.2.1 The simplified "sway - non sway" criterion 4
7.2.2 The definition of "sway moments" 56
7.2.3 The amplified sway moments method7
7.2.4 The sway mode buckling lengths method8
7.2.5 Second order approach for SLS checks9
7.3 - EUROCODE 8 5
7.3.1 Second order approach for SLS checks 5
7.3.2 Values of the behaviour factor "q"
7.3.3 Post-elasticr of frames 60
7.3.4 Horizontal deflection checks
7.4-GENERAL 6
7.4.1 Importance of the SLS horizontal deflection checks in "sway
frames"7.4.2 Influence of the shear strains 61
7.4.3e of the column bases support conditions ß\
8 - FURTHER RESEARCH 62
9 - LIST OF SYMBOLS3
10 BIBLIOGRAPHY4
11 - LIST OF FIGURES AND TABLES8

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