Abstract
A plan irregularity rapid visual screening method for seismic performance assessment of wood-frame, single-family dwellings is presented. Results from 124 samples were compared with (a) building-specific, nonlinear time-history analysis and (b) FEMA 154 and ASCE 31 Tier 1. Verification using two houses damaged in the 1994 Northridge Earthquake is presented. The method includes effects of shape, torsional forces from eccentricity, and is based on conservative values of shear wall capacities and a nonlinear time-history analysis. The method is relatively more conservative than ASCE 31 Tier 1 and FEMA 154, and provides conservative but reasonable predictions of actual earthquake damage.
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