人工拟合地震动时程参数对场地反应的影响分析

采用目标谱拟合法人工合成地震动时程,拟合过程中对包络线参数进行定量的变化,进行土层地震反应分析.根据其对场地反应的影响,讨论时程参数对人工拟合地震动时程的影响规律,为场地抗震设防参数的选取提供依据.研究结果表明:t1、t2和c不同时,所拟合的地震动时程对土层地震反应结果有较大影响,其影响程度与土层结构关系密切.

Analysis on the Influence of Artificial Fitting Time-history Parameters of Seismic Ground Motion to Site Earthquake Response

The target spectral fitting method is used to synthesize time-history of ground motion. The soil seismic response is analyzed by quantitalively changing the parameters of envelope, which could influence the site response in the process of artificial fitting ground motion time-history. In order to provide the basis for site fortification against earthquake, the influences of the time-history parameters are discussed. The results show that, when t1,t2 and c taking different values, the soil seismic response are greatly affected by the fitting ground motion time-history, and the influence degree is closely related to the soil structure.