Preliminary Results from FEMA P695 Study on Coupled Composite Plate Shear Walls--Concrete-Filled

This paper presents preliminary findings from a study conducted to determine the R-factor (and other parameters, Cd and Ω0) for Coupled CPSW/CF using the FEMA P-695 procedure, which is intended to ensure that an adequate margin against collapse exists for the maximum considered earthquake (MCE) hazard. This is established by performing incremental dynamic analysis for the 44 earthquake ground motion records specified by the FEMA P-695 methodology. The findings are intended to substantiate proposed response modification factor R; deflection amplification factor, Cd; and system over-strength factor, Ω0) for these type of walls in subsequent editions of ASCE 7. A larger R factor is foreseen for coupled composite walls; more specifically, the current R-value of 6.5 specified in ASCE 7-16 for composite walls could potentially increase to a value as high as 8.

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