SEISMIC DESIGN FACTORS FOR PRECAST CONCRETE SHEAR WALL PARKING GARAGES

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SEISMIC DESIGN FACTORS FOR PRECAST CONCRETE SHEAR WALL PARKING GARAGES

Author: A. E. SCHULTZ , B. ERKMEN , R. A. MAGAÑA | Size: 0.43 MB | Format: PDF | Quality: Unspecified | Publisher: 13th World Conference on Earthquake Engineering Vancouver, B.C., Canada August 1-6, 2004 Paper No. 2076 | Year: 2004 | pages: 15

This paper describes an analytical study for the evaluation of seismic design factors (R and Cd) for precast concrete shear wall structures used for parking garages. The study utilizes DRAIN-2DX models to represent the garages, in which precast concrete shear walls provide all resistance to lateral loads. The models were calibrated using experimental data from tests, and a parametric study of typical precast concrete parking garage structures was conducted to obtain the response modification factor, R, and displacement coefficient, Cd, as specified by 2000 provisions of the United States (US) National Earthquake Hazard Reduction Program (NEHRP) for use in seismic design practice [1]. The R and Cd factors were calculated using real-time, nonlinear, dynamic response of the parking garage structures obtained using DRAIN-2DX. The precast shear walls feature one of two types of primary reinforcement; unbonded post-tensioning bars, and partially debonded mild steel reinforcing bars. The study addresses variables that are recognized to affect nonlinear structural response, including seismic intensity and site conditions. The principal conclusion drawn from this study is that R and Cd values currently used for precast concrete shear wall buildings are acceptable, if not conservative, for seismic design practice

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