Introduction to seismic analysis of coupled composite plate shear walls - concrete-filled (CC-PSW/CF)

摘要

Understanding the characteristics of the seismic response of coupled composite plate shear walls - concrete-filled (CC-PSW/CF) systems is integral to their use and adoption in practice. Currently, a FEMA P695 study is underway to develop recommendations for the seismic design, response modification factor (R factor), overstrength factor (Ω_0), and deflection amplification factor (C_d). The FEMA P695 process involves: (ⅰ) designing archetype structures representative of the design space, (ⅱ) developing and calibrating numerical models, and (iii) and subjecting these numerical models to factored ground motions until failure. The study is targeting an R factor of 8 for the CC-PSW/CF system. This paper summarizes the development, modeling, analysis, and results of one such archetype structure. The numerical models for composite walls and coupling beams were developed and calibrated using experimental results. The archetype structure design was modeled using these calibrated numerical models. Nonlinear static pushover and incremental dynamic (nonlinear time history) analyses were performed to characterize the seismic response. The adjusted collapse margin ratio (3.2) for this structure exceeds the lowest limit set in FEMA P695 (2.2). Further analysis of archetype structures representing the entire design space is being performed. Comprehensive results from these analyses will be used to finalize recommendations for the seismic design, response modification factor, overstrength factor, and deflection amplification factor for CC-PSW/CF.