Complex Moduli for Seismic Response Analysis of Ground

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  • 地盤の地震応答解析のための複素剛性

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<p>Modeling methods to obtain frequency-independent stress-strain relationships for complex modulus used in seismic response analysis of ground are discussed. In addition, a new complex modulus for the seismic response analysis of ground, named the YAS (Yoshida-Adachi-Sorokin) model, is proposed, which is designed so that the maximum stress and the hysteretic energy absorption agree with those of the cyclic shear test. It is shown that the complex modulus, in which the maximum stress and the damping ratio agree with those of the test result, is possible only when the damping ratio is less than 0.5. Then, three complex moduli, the Sorokin model used in the original SHAKE, the Lysmer model that is proposed to improve Sorokin model and is used widely in the equivalent linear method, and the YAS model, are compared and discussed. Obtained conclusions are as follows. The Sorokin model overestimates the maximum shear stress. The Lysmer model gives the same maximum stress as the cyclic shear test, but it underestimates the hysteretic energy absorption. Underestimation of energy absorption is less than 5 % for damping ratio less than 0.3 that are important damping ratio in practical use.</p>

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