Experimental Evaluation of Posttensioned Hybrid Coupled Wall Subassemblages
Publication: Journal of Structural Engineering
Volume 132, Issue 7
Abstract
Eleven half-scale experiments were conducted to investigate the nonlinear reversed cyclic behavior of coupling beam subassemblages in a new type of hybrid coupled wall system for seismic regions. In this new system, coupling of concrete walls is achieved by posttensioning steel beams to the walls using unbonded posttensioning tendons. Different from conventional hybrid coupled walls, the coupling beams are not embedded into the walls. Each test specimen described in this paper includes a steel coupling beam and the adjacent concrete wall regions at a floor level. Steel top and seat angles are used at the beam-to-wall connections to yield and provide energy dissipation. The test parameters include the angle leg thickness, angle gauge length, beam flange cover plate, posttensioning steel area, and beam depth. The results demonstrate excellent stiffness, strength, and ductility characteristics of properly designed subassemblages under cyclic loading, with considerable energy dissipation concentrated in the angles. The specimens were able to sustain large nonlinear displacements without significant damage in the beams and the wall regions; demonstrating that these structural components would require little repair, if any, after a severe earthquake. The residual deformations upon unloading of the specimens were negligible due to the restoring effect of the posttensioning force.
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Acknowledgments
This investigation was funded by the National Science Foundation (NSF) under Grant No. NSFCMS 98-10067 as a part of the U.S.–Japan Cooperative Earthquake Research Program on Composite and Hybrid Structures. The support of the NSF Program Director, Dr. S. C. Liu, and Coordinators, Dr. S. Goel and Dr. S. Mahin, is gratefully acknowledged. The writers thank the ACI Committee 335 on Composite and Hybrid Structures and Dr. K. Harries for providing guidance. The opinions, findings, and conclusions are those of the writers and do not necessarily reflect the views of the NSF or the individuals and organizations acknowledged here.
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© 2006 ASCE.
History
Received: Dec 17, 2003
Accepted: Dec 28, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
Notes
Note. Associate Editor: Tso-Chien Pan
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