Seismic Behavior of Code-Designed Bidirectionally Eccentric Systems
Publication: Journal of Structural Engineering
Volume 131, Issue 10
Abstract
Extreme seismic vulnerability of bidirectionally eccentric structural systems such as street corner buildings has been demonstrated repeatedly during past severe earthquakes. Inelastic range response of such structural systems may vary considerably depending upon the sense of eccentricities regulated by relative quadrant wise position of center of stiffness with respect to center of mass particularly for reinforced concrete (RC) structures with strength and stiffness degrading behavior. Recognizing the same, an effort has been made in the present paper to analyze the inelastic range response of bidirectionally asymmetric structures designed as per the existing codal standards. Such response helps to perceive the adequacy of the code provisions to minimize the progressively damaging effects expected to arise in RC bidirectionally eccentric structural systems due to strength and stiffness degradation under severe seismic excitation. The effect of change in stiffness eccentricity due to cracking of reinforced concrete members is also attempted to be studied in the limited form. Inelastic seismic response of code-designed bidirectionally eccentric structural systems with only strength deteriorating and only stiffness degrading structural elements are also investigated to examine the potential of such comparatively simpler hysteresis models. Effort has also been made toward assessing the response of similar elastoplastic structural systems. The study clearly indicates the limitation of the design code provisions to take adequate care of seismic torsional vulnerability of bidirectionally eccentric structures made up of strength and stiffness degrading RC structural elements. However, the performance of the same seems satisfactory for elastoplastic structural systems.
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Acknowledgments
The writers are largely indebted to the reviewers as they improved upon the quality of the paper through their profound suggestions. In particular, conceptual enlightenment through a recent publication of Professor T. Paulay, highlighted by one of the reviewers, is gratefully acknowledged. Further, acknowledgement is also due to the financial help obtained through a research project sanctioned by the Extramural Research Division of Council of Scientific and Industrial Research, Government of India [vide sanction no. 22(0347)/02/EMR-II] for successful completion of the work presented in the paper.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 131 • Issue 10 • October 2005
Pages: 1497 - 1514
Copyright
© 2005 ASCE.
History
Received: Mar 4, 2003
Accepted: Feb 9, 2005
Published online: Oct 1, 2005
Published in print: Oct 2005
Notes
Note. Associate Editor: Sanj Malushte
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