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针对结构动力分析过程中实际地震动记录的合理选择问题,对选择实际地震动记录的思路、选择过程中数据库的建立及记录的筛选、选择地震动记录的原则、幅值调整和样本数量等问题进行了分析,提出了采用遗传算法和贪婪算法相结合的方式优化选择地震动记录样本的方法,对目前采用匹配设计加速度谱方法选择的实际地震动记录的输入能量特征进行了分析.采用所提出的优化选择方法可以使选择的记录均值谱与目标谱在控制周期段内较好的吻合,各记录反应谱之间的离散性较小,而且可以控制重要周期段各周期点均具有比限值更小的误差.考虑结构的累积损伤或分析具有明显耗散特性元件的结构,采用仅匹配加速度设计谱选择的记录并不适用,建议了考虑输入能量需求选择地震动输入的方法.
In view of the reasonable selection of actual ground motion records in the process of structural dynamic analysis, the problems of choosing actual ground motion records, establishing database in selection process, selecting records, selecting principles of ground motion records, adjusting amplitude and number of samples The paper proposes a method of optimizing the selection of ground motion recording samples by means of combining genetic algorithm and greedy algorithm and analyzes the input energy characteristics of the actual ground motion records selected by the method of matching design acceleration spectroscopy. The optimal selection method can make the selected record mean value spectrum agree well with the target spectrum in the control period, the discrepancy between each recorded response spectrum is small, and the ratio of the specific period Smaller errors. Considering the cumulative damage of the structure or analyzing the structure of the element with obvious dissipation characteristics, it is not suitable to use only the records that match the design spectrum of the acceleration design. It is suggested to select the input method of ground motion considering the input energy demand.