Seismic Performance Assessment of Wood-Frame Shear Wall Structures Subjected To Ground Motion Variations

Abstract eng:
Wood-frame shear wall buildings are commonly used for residential and non-residential buildings. Reliable prediction of the seismic behavior of this structural system requires an understanding of the variability in the seismic performance from the inherent randomness associated with the prediction of seismic demand from ground motions. This paper assesses the influence of certain characteristic features of selected earthquake ground motions including the source-to-site distance (far-field and near-field ground motions), scaling methods (amplitude scaling and spectrum matching) and ground motion response history amplitude features (peak ground acceleration and velocity) on the computed seismic behavior, up to collapse, of wood-frame shear wall buildings. To capture the influence of these ground motion variations in the seismic performance of wood-frame shear wall buildings, a sample set of four building models with different design features were selected from those that were originally studied in the FEMA P-695 report. Incremental nonlinear dynamic analysis is performed on the selected building models using the FEMA P-695 ground motion record sets. The results from dynamic analysis is used to compute the median drift and base shear demands at design spectral intensities and collapse margin ratio (CMR) at collapse level spectral intensities. These metrics are used to compare the performance of the selected building models.

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