Seismic Performance Variability of Wood-frame Shear Walls Designed In Accordance to the National Design Specification (NDS)

摘要

Due to the inherent variation of wood as a biological building material, the seismic performance of nominally identical wood buildings can be highly variable. In light-frame wood construction, the performance of the structure under lateral loads depends on the performance of the wood shear walls which are part of the main lateral force resisting system. In this study, the seismic performance of typical wood shear wall configurations such as fully sheathed shear walls and walls with garage and pedestrian door openings are investigated. The variability in the wood shear wall strength arises from the inherent uncertainty in the connectors and framing materials, and also the input ground motions. The far-field ground motion ensemble developed as part of the ATC-63 project is used in nonlinear time history analyses to capture the ground motion uncertainty. In addition, the drift performances of the NDS-compliance shear walls considering the performance levels prescribed in ASCE-41 for immediate occupancy (1% drift), Life safety (2% drift) and collapse prevention (3% drift) are discussed.