REQUIRED YIELD STRENGTH RATIO SPECTRUM AND ITS APPLICATION FOR VERIFICATION OF SEISMIC SAFETY OF A STRUCTURE EXCITED BY SEVERE EARTHQUAKE MOTIONS

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  • 所要降伏強度比スペクトルとこれを用いた強震時終局安全性の一照査方法について
  • ショヨウ コウフク キョウドヒ スペクトル ト コレ オ モチイタ キョウシン

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Abstract

The objective of this study is to develop a practical method to verify the safety for an ultimate limit state of SDOF structures excited by severe earthquake motions. In this study, the required yield strength ratio RR is defined as the value of yield strength ratio R by which the value of a given damage index D for a structure becomes to be a prescribed one DR, which corresponds to an ultimate limit state of the structure. Then a verification method of the seismic safety, by the use of RR spectrum, is suggested. As a concrete example of the method, the RR spectrum for the SDOF structures with Q-hyst type of restoring force model is obtained by using the Park and Ang's damage index D (DR=1.0, 0.75, 0.5) and thirty artifical earthquake motions which vary in their A/V value (A is maximum acceleration and V is maximum velocity). After examination of the influence of structural parameters and A/V value of the earthquake motions on the RR, the regression equation for the RR is derived.

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