| Summary: | 碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班 === 106 === The purpose of this study is to establish a modified strong ground motion time history simulation model with random parameters and develop a corresponding computer simulation program to generate the required acceleration duration for seismic engineering research or practical design. This model is mainly derived from the models mentioned by Li Jie and Wang Ding, improving its Brune source displacement amplitude spectrum and displacement phase spectrum, thereby increasing the initial phase parameters of the path effect, and using the direct inverse fast Fourier transform to replace the narrow bandwidth originally used. Harmonic superposition method was used to verify this random parameter strongly modified model.
In this study, the verification and simulation of the proposed model were performed using the ground surface acceleration records of four stations during the Kobe Earthquake in 1995, and compared with the Fourier amplitude spectrum and phase spectrum of the true strong ground motion record, and the corresponding randomization was obtained. parameter. Finally, the strong ground motion time history simulation record generated by the inverse fast Fourier transform is used to verify whether it matches the true strong ground motion acceleration.
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