Abstract
To simplify the non-linear dynamic design procedure on steel moment-resisting frames to seismic actions, a new design-friendly reduced analysis is proposed. Global safety domain against plastic collapse of an elastic-plastic frame becomes a convex polyhedron, and its whole figure is approximated also by a hyper-ellipsoidal yield surface from a few reference points on the surface. Its validity is checked by comparison with the results of pseudo-dynamic tests on a 2-story steej frame and a detailed computer analysis on a 9-story 3-bay frame.
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