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首页> 美国政府科技报告 >Stochastic Modeling and Simulation of Near-Fault Ground Motions for Performance-Based Earthquake Engineering.
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Stochastic Modeling and Simulation of Near-Fault Ground Motions for Performance-Based Earthquake Engineering.

机译：基于性能的地震工程近断层地震动随机建模与仿真。

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摘要

A comprehensive parameterized stochastic model of near-fault ground motions in two orthogonal horizontal directions is developed. The proposed model uniquely combines several existing and new sub-models to represent major characteristics of recorded near-fault ground motions. These characteristics include near-fault effects of directivity and fling step; temporal and spectral non-stationarity; intensity, duration and frequency content characteristics; directionality of components, as well as the natural variability of motions for a given earthquake and site scenario. By fitting the model to a database of recorded near-fault ground motions with known earthquake source and site characteristics, empirical “observations” of the model parameters are obtained. These observations are used to develop predictive equations for the model parameters in terms of a small number of earthquake source and site characteristics. Functional forms for the predictive equations that are consistent with seismological theory are employed. A site-based simulation procedure that employs the proposed stochastic model and predictive equations is developed to generate synthetic near-fault ground motions at a site. The procedure is formulated in terms of information about the earthquake design scenario that is normally available to a design engineer. Not all near-fault ground motions contain a forward directivity pulse, even when the conditions for such a pulse are favorable. The proposed procedure produces pulse-like and non-pulse-like motions in the same proportions as they naturally occur among recorded near-fault ground motions for a given design scenario.

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