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首页> 美国政府科技报告 >Estimation of long period ground motions for use in analysis of base-isolated structures. New Production Reactors Program.
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Estimation of long period ground motions for use in analysis of base-isolated structures. New Production Reactors Program.

机译：用于分析基础隔震结构的长周期地面运动的估算。新生产反应堆计划。

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Typically, engineering seismology has been concerned with high frequency ground motions. High frequency motions are very complex and are often assumed to be stochastic. Physically, high frequency ground motions are generated by the acceleration or deceleration of the rupture front and by variations in the amount of slip along the fault. The propagation of high frequency waves (including scattering) is affected by the small scale heterogeneities in the crust. Therefore, the high frequency ground motions are sensitive to the fine details of the source process as well as the fine details of the geologic structure. As a result, ground motion simulations using theoretical models based on gross models of the source process and geologic structure do not reliably predict high frequency motions. Successful simulations of high frequency ground motions use stochastic, empirical or semi-empirical models. This report discusses seismic base isolation which is a design method that shifts the response of a structure from high frequencies to moderate or low frequencies depending on the type of isolator used. This shift reduces the effect of the peak acceleration on the structure, but increases the effect of the peak velocity and peak displacements. Therefore, for base-isolated structures, the concern is with the long period ground motions.

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