Advances in Performance-Based Earthquake Engineering

Performance-based Earthquake Engineering has emerged before the turn of the century as the most important development in the field of Earthquake Engineering during the last three decades. It has since then started penetrating codes and

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GEOTECHNICAL, GEOLOGICAL, AND EARTHQUAKE ENGINEERING Volume 13 Series Editor Atilla Ansal, Kandilli Observatory and Earthquake Research Institute, Boˇgaziçi University, Istanbul, Turkey Editorial Advisory Board Julian Bommer, Imperial College London, U.K. Jonathan D. Bray, University of California, Berkeley, U.S.A. Kyriazis Pitilakis, Aristotle University of Thessaloniki, Greece Susumu Yasuda, Tokyo Denki University, Japan

For further volumes: http://www.springer.com/series/6011

Advances in Performance-Based Earthquake Engineering ACES Workshop edited by

MICHAEL N. FARDIS Department of Civil Engineering, University of Patras, Greece

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Editor Michael N. Fardis University of Patras Department of Civil Engineering P.O. Box 1424 265 04 Patras Greece [email protected]

ISBN 978-90-481-8745-4 e-ISBN 978-90-481-8746-1 DOI 10.1007/978-90-481-8746-1 Springer Dordrecht Heidelberg London New York Library of Congress Control Number: 2010929682 © Springer Science+Business Media B.V. 2010 No part of this work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording or otherwise, without written permission from the Publisher, with the exception of any material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)

Preface

Historically, introduction and enforcement of structural design codes and standards has been the responsibility of competent Authorities, with public safety as their overriding consideration. So, traditional seismic design codes or standards, especially for buildings, aim at protecting human life by preventing local or global collapse under a specific earthquake level with low probability of exceedance. However, in the 1960s the international earthquake engineering community was already aware of the importance of property loss and other economic consequences caused by more frequent seismic events. Recognizing that it is not feasible to avoid any damage under strong earthquakes, the Structural Engineers Association of California (SEAOC) adopted in its 1968 recommendations the following requirements for seismic design: “Structures should, in general, be able to: – Resist a minor level of earthquake ground motion without damage. – Resist a moderate level of earthquake ground motion without structural damage, but possibly experience some nonstructural damage. – Resist a major level of earthquake ground motion having an intensity equal to the strongest either experienced or forecast for the building site, without collapse, but possibly with some structural as well as nonstructural damage.” Major earthquakes that hit developed countries in the second half of the 1980s and the first half of the 1990s caused relatively few casualties but very large damage to property and other economic losses. In response to this, “Performance-based