514 模擬地震波群に対する弾塑性履歴系の最大応答の変動に関する検討

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  • 514 A Study about Variance of Maximum Response on Elasto-plastic Structure Excited by Synthesized Ground Motions

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A number of artificial earthquake ground motions compatible with time-frequency characteristics of recorded actual earthquake ground motions as well as the given target response spectrum are generated using wavelet transform. The Coefficient of variation (C. O. V.) of maximum displacement, maximum velocity and maximum acceleration in elasto-plastic SDOF systems excited these artificial ground motions are numerically evaluated. The C. O. V. based on different time-frequency characteristics of artificial ground motions, different input intensity and different natural periods of SDOF systems are compared. The trajectory of mass around maximum displacement and the variances of displacement with maximum displacements are shown. It is recognized that the C. O. V. become large as input intensity is large and as natural period is small. It is also recognized that the variances of displacements jump and reach the maximum value at the moment occurred plastic drift in displacement. And the fluctuation of variances of displacement fairly corresponds with the fluctuation of maximum values of displacement.

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