正負地動パルスによる1自由度完全弾塑性系の地震応答の予測

概要

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Although time history analysis gives us detailed information about earthquake response, explicit formulas and simplified methods are efficient to highlight the structural response that are decided by earthquake input and structure characteristics. However, recent near-fault earthquakes shown strong pulse-like ground motion component in velocity, and the well established methods applied in structural design based on stable vibration could not explain structural response consistently. In this paper, earthquake motions are simplified as rectangular acceleration pulses and velocity pulses that are solely related with peak values of ground motions, then, structural response are directly solved using the equation of motion, and explicit formulas are obtained for maximum displacement and velocity. The proposed method results a series of simple explicit formulas, and gives an extremely simple correlation between structural response and seismic demand with peak values of ground motion. Finally, Rt factor and Ds factor assigned in Japanese seismic design for building structures are discussed.
一般社団法人日本建築学会の論文
2004-03-20