Investigation of the Axial Load Capacity for Lightly Reinforced Wall Piers
Publication: Journal of Structural Engineering
Volume 134, Issue 9
Abstract
A large number of reinforced concrete buildings constructed prior to the mid-1970s in western North America rely on lightly reinforced, perforated, perimeter shear walls to resist earthquake-induced lateral forces. Although a substantial number of piers may exist, deformation demands can significantly exceed acceptable levels for plastic deformations published in common acceptance criteria such as FEMA 356. A shear-friction model is used to establish the ability of wall piers to support vertical loads after substantial loss of pier lateral-load capacity. The model results indicate that typical wall piers are capable of sustaining relatively large lateral drift ratios prior to loss of vertical load-carrying capacity, which is consistent with postearthquake observations. However, preliminary test results indicate that the drift capacity may be substantially less for poorly detailed walls, where axial failure occurred at a lateral drift ratio of approximately one percent.
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Acknowledgments
The writers would like to acknowledge the valuable input provided by Dr. Kutay Orakcal, formally a doctoral student at the Civil and Environmental Engineering Department at UCLA and now an assistant professor at Bogazici University, Istanbul, Turkey, as well as input and comments provided by John Gavan, Ayse Kulahci, Aaron Reynolds, and Dr. Luis Toranzo at KPFF Consulting Engineers, Los Angeles.
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Copyright
© 2008 ASCE.
History
Received: Mar 7, 2005
Accepted: Oct 8, 2007
Published online: Sep 1, 2008
Published in print: Sep 2008
Notes
Note. Associate Editor: Rob Y. H. Chai
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