Performance-based seismic analysis and design improvements of two precast concrete structural systems

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2008-01-01
Authors
Rahman, Mohammad
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Sri Sritharan
Terry J. Wipf
Fouad S. Fanous
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Civil, Construction, and Environmental Engineering
Abstract

This study focuses on the multiple-level seismic performance in terms of structural and non-structural damages of precast hybrid frame and jointed precast post-tensioned wall systems through dynamic analysis of precast buildings subjected to spectrum compatible ground motions of various intensities. The maximum transient interstory drift, residual interstory drift and floor acceleration are considered as acceptance criteria for evaluating seismic performance of these systems subjected by four levels of ground motions. Interstory drift and floor acceleration are directly related to structural and non-structural damages, respectively. Two dimensional non-linear finite element analytical models for hybrid frames and jointed wall systems used in this study are validated against test results for a five story test building. In designing both precast systems, it is shown that traditional force-based design approach results in significantly higher level of design base shear compared to direct displacement-based design approach. After observing satisfactory performance in the five story model building designed by direct displacement-based approach, similar multiple-level seismic performance is evaluated for five, seven and ten story buildings designed by direct displacement-based method. These low to mid-rise full scale precast hybrid frame and jointed precast post-tensioned wall systems also exhibit the maximum transition interstory drift, residual interstory drift and floor acceleration within the acceptable limits, thus it is recommended that these systems may be utilized as primary lateral load resistant structural systems when designed by the economic approach of direct displacement-based design. Influence of variation of heights of buildings on the performance of these systems is also examined.

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Tue Jan 01 00:00:00 UTC 2008