Variability in Seismic Collapse Probabilities of Solid- and Coupled-Wall Buildings
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Volume 145, Issue 6
Abstract
Reinforced concrete walls are a common lateral load–resisting system for buildings. Common wall configurations are solid planar or solid flanged (H, I, T, L, or C-shaped cross sections) and coupled planar or flanged walls. A coupled-wall system comprises two solid walls linked at most floors by coupling beams that typically have length-to-depth ratios ranging from 2 to 4. In low- to midrise buildings, solid walls are expected and designed to form a single plastic hinge at the base of the wall; in mid- to high-rise buildings, a second hinge is expected in the upper half of the buildings. In coupled walls, plastic hinges are expected at the ends of the coupling beams and at the base of the wall. Because coupled walls offer a more distributed plastic mechanism, they are considered to provide superior earthquake performance to solid walls. This study employs nonlinear incremental dynamic analysis with the suite of ground motions from crustal earthquakes and a set of six idealized wall buildings of varying height to test the hypothesis that coupled walls provide reduced earthquake collapse risk over solid walls; to establish the sensitivity of collapse to modeling decisions and model parameters; and to identify design decisions that can reduce earthquake collapse risk.
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Acknowledgments
This research was funded by the National Science Foundation (NSF) under Grant No. EAR-1331412 and by the Applied Technology Council ATC-123 report. The computations were supported by the University of Washington through the Hyak advanced computing system. Computational analyses were supported also by NSF Grant No. 1520817 (NHERI Cyberinfrastructure), which funds advanced computing resources at the Texas Advanced Computing Center. Any opinion, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsoring agencies.
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Journal of Structural Engineering
Volume 145 • Issue 6 • June 2019
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©2019 American Society of Civil Engineers.
History
Received: Feb 22, 2018
Accepted: Oct 22, 2018
Published online: Apr 15, 2019
Published in print: Jun 1, 2019
Discussion open until: Sep 15, 2019
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