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Constant-ductility strength demand spectra for seismic design of structures

Zhai Changhai (翟长海)1 and Xie Lili (谢礼立)1,2

  1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
  2. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

Abstract: In displacement-based seismic design, constant-ductility strength demand spectra (CDSDS) are very useful for preliminary design of new structures where the global displacement ductility capacity is known. The CDSDS can provide the required inelastic lateral strength of new structures from the required elastic lateral strength. Based on a statistical study of nonlinear time-history for an SDOF system, the mean CDSDS corresponding to four site conditions are presented and approximate expressions of the inelastic spectra are proposed, which are functions of the structural period and ductility level. The effects of site conditions, structural period, level of ductility, damping and post-yield stiffness of structures on CDSDS are also investigated. It is concluded that site conditions, ductility level and structural period have important effects on the CDSDS and damping, post-yield stiffness effects are rather complex and of minor importance. The damping, post-yield stiffness effects depend on both the level of ductility and the natural period of structures.

Keywords: displacement-based seismic design; CDSDS; site conditions; damping; hysteretic model

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Copyright 2009 IEM. Journal of Earthquake Engineering and Engineering Vibration. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as described below, without written permission from the Publisher. Copying of articles is not permitted except for personal and internal use, to the extent permitted by national copyright law, or under the terms of a license issued by the National Reproduction Rights Organization of China.