Seismic P-D effects in medium height moment resisting steel frames

Abstract

An analytical investigation of the P-A effects in medium height steel moment resisting frames to selected earthquake motions is reported. The frames with various design drifts and fundamental natural periods were designed according to the load provisions for New Zealand seismic risk zone A of the Draft Code of Practice for General Structural Design and Design Loading for Buildings, DZ4203. The effect of strength degradation was investigated. Dynamic magnifica-tion factors for the member forces and displacement are also presented. Limits for the maximum plastic hinge rotation, inelastic drift, curvature ductility, displacement ductility and prediction of maximum plastic hinge rotation based on the inter-storey drift are suggested.