Confinement Behavior of Rectangular Reinforced Concrete Prisms Simulating Wall Boundary Elements
Publication: Journal of Structural Engineering
Volume 143, Issue 4
Abstract
Observations following recent earthquakes, and from structural testing, indicate numerous brittle compression failures in reinforced concrete seismic-resisting walls. This is unexpected, as most seismic-resisting walls are designed to be tension-controlled. The problematic compressive response led to two independent studies, each individually aimed at identifying design and loading parameters that affect the seismic deformability of the compression regions (or boundary elements) of seismic-resisting walls. These experimental studies are combined here for a more complete understanding. Both studies used axially loaded, rectangular reinforced concrete specimens that simulate seismic-resisting wall boundary elements. The rectangular prisms were tested under cyclic axial loading or monotonic compression, with a focus on the following parameters: boundary element detailing classification, detailing of transverse reinforcement, maximum tensile strain preceding compressive demand, and cross-sectional aspect ratio. Test results indicate that expected strength and deformation capacity can be overestimated unless a rectangular hoop restrains every longitudinal reinforcing bar; use of crossties does not guarantee stability of the longitudinal reinforcement. Tensile strains of 2 and 5%, imposed prior to reaching the compressive capacity, resulted in compression strength reductions of 20 and 50%, respectively, indicating that load-history can also be important.
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Acknowledgments
The work completed at the UCh was financially supported by InnovaChile-Corfo under Grant No. 10CREC. The contribution of the Chilean Concrete and Cement Institute (ICH) through Mr. Augusto Holmberg is also greatly acknowledged. The work completed at the U.S. Army Corps of Engineers Construction Engineering Research Laboratory (CERL) is part of a continuing study financially supported by the National Earthquake Hazards Reduction Program (NEHRP) at the National Institute of Standards and Technology. The authors would like to specifically recognize Dr. Steven McCabe (NEHRP) for his contributions to this research project including deft oversight, technical insights and valuable feedback. The idea and value of this research resulted from Dr. McCabe’s continuous leadership in earthquake engineering. The authors would like to acknowledge the contributions from students including Mr. Jesús Núñez (UCh), Mr. Ahraaz Qureishi (CERL), and Mr. Alex Hargus (CERL) for their assistance in the development, construction, and testing of the specimen results presented in this paper.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 4 • April 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Mar 18, 2015
Accepted: Aug 29, 2016
Published online: Oct 28, 2016
Discussion open until: Mar 28, 2017
Published in print: Apr 1, 2017
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