DYNAMIC ANALYSIS WITH REDUCED VIBRATION MODES BASED ON AN INCLINED ELLIPSOIDAL APPROXIMATION OF PLASTIC FAILURE SURFACE FOR STEEL MOMENT RESISTING FRAMES

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  • 鉄骨ラーメン骨組塑性崩壊面の傾斜楕円体近似による部分モード地震応答解析

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The method to simplify the plastic failure surface for steel moment resisting frames is proposed. Safety domain against plastic collapse of an elastic-perfectly plastic frame is approximated by a yield-polyhedron with reduced number of failure modes. In addition, such a plastic failure surface is also well approximated by an inclined ellipsoid. A simplified response analysis with reduced number of vibration mode is performed based on the simplified elliptic plastic surface model, and the results match with those of detailed frame analysis based on member hysteresis models.

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