Dynamic Evaluation of PreWEC Systems with Varying Hysteretic Energy Dissipation
Publication: Journal of Structural Engineering
Volume 144, Issue 10
Abstract
The precast wall with end columns, known as the PreWEC, was developed as a solution for resisting earthquake lateral loads and validated using quasistatic testing. This paper presents a shake table investigation of this system, which evaluated the performance of four PreWEC test units with total damping varying between 9 and 16% using multiple-level earthquake input motions. Different amounts of lateral resistance were targeted for the four test units by varying key design parameters, including the posttensioning area, location of the end columns, and number of the connectors joining the end columns to the wall panel. Results from this study: (1) confirmed the ability of using PreWECs with different locations for the end columns; (2) validated good seismic performance for all four systems in terms of the maximum transient drift, absolute acceleration, and residual drift; and (3) enabled the response modification coefficient (or factor) to be expressed for the PreWEC system as a function of available damping. Based on the test outcomes, the procedure for designing PreWEC systems is presented.
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Acknowledgments
The study reported in this paper was based upon the NEES Rocking Wall project supported by the National Science Foundation under Grant No. CMMI-1041650, and Dr. Joy Pauschke has served as the program director for this grant. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. All shake table tests were conducted using the NEES shared facility at the University of Nevada, Reno. The test units were donated by Clark Pacific and MidState Precast through coordination by PCI West. Materials provided by Sumiden Wire, GTI, Hayes Industries and help provided by Ironworker Local 118 with posttensioning of specimens are also gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 10 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Apr 22, 2017
Accepted: Apr 9, 2018
Published online: Jul 27, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 27, 2018
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