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合理的地震动记录选择与调整是影响结构非线性时程分析结果可靠度的重要因素之一。选择7组地震动记录分别运用谱匹配方法和按结构基本周期对应谱加速度S_a(T_1)调整方法进行调整,并分别对5层和11层钢筋混凝土平面框架输入调整后的地震动记录,进行单一强度水准下的非线性时程分析,提取结构最大层间位移角和最大残余层间位移角为工程需求参数进行了离散性分析和偏差研究。分析结果表明,选择合理的地震动记录进行调整和对目标谱的匹配可以减小结构地震响应分析结果的离散性,且响应分析结果不会出现较大程度的偏差;相同强度S_a(T_1)下,结构地震响应分析结果随条件谱谱形参数ε的增大而减小。
Reasonable selection and adjustment of ground motion records are one of the important factors that affect the reliability of nonlinear time-history analysis. Seven groups of ground motion records were selected to be adjusted respectively by spectrum matching method and adjustment of corresponding spectrum acceleration S_a (T_1) according to the structure basic period, and the adjusted ground motion records were input to the fifth and eleventh layers of reinforced concrete plane frames respectively, The nonlinear time history analysis of strength level, the maximum inter-story displacement angle and the maximum residual layer inter-story displacement angle were used to analyze the discreteness and deviations of engineering requirements. The analysis results show that the selection of reasonable ground motion records to adjust and match the target spectrum can reduce the discreteness of the results of structural seismic response analysis, and the response analysis results will not appear a large degree of deviation; under the same intensity S_a (T_1) , The results of structural seismic response decrease with the increase of spectral shape parameter ε of the conditional spectrum.