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Simplified seismic fatigue evaluation for rigid steel connections

Ayman A. Shama1, John B. Mander2 and Stuart. S. Chen3

  1. Parsons Corporation, 100 Broadway, New York, NY 10005, USA

  2. Department of Civil Engineering, University of Canterbury, New Zealand

  3. Department of Civil, Structural & Environmental Engineering, State University of New York at Buffalo, Buffalo, NY 14260, USA

Abstract: A simplified fatigue-life model is proposed for assessing the seismic inelastic rotational capacity of steel connections. First relations are developed for rigid steel connections under lateral loading. Next this is extended to account for the effects of the welded steel moment frame (WSMF) connections of the so-called pre-Northridge type. The seismic fatigue theory is validated against experimental results. The experiments were conducted under increasing ductility amplitudes until the onset of fracture. Miner’ rule was used to convert the test results to given an equivalent constant amplitude cyclic fatigue life. Satisfactory agreement is obtained when comparing the experimental observations with the theoretical predictions.

Keywords: fatigue; cyclic load; seismic; pile-to-cap; moment frames; connections; steel

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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.