地震动记录选取及其对网架屋盖动力响应的影响

Influence of earthquake records selection on the dynamic response of Grid Roof

地震动记录的合理选取对预测结构响应有着重要的作用。本文通过对风雨操场建筑混合结构的抗震性能分析,提出了一种对水平及竖向地震动频谱特性均进行控制的改进选波方法。为了评价不同选波方法的可靠性和有效性,根据初选条件选取55组三向地震动记录,并以55组地震动的统计反应谱作为目标反应谱,以55组记录计算的结构响应均值作为"预测值",通过与单周期点和双频段选波方法的计算结果对比,分析表明:改进选波方法计算的结构基底剪力、柱顶位移、支座位移和网架竖向位移的相对误差和变异系数均小于前两种选波方法,其计算结果更加可靠有效。

The proper selection of ground motion records is critical for predicting structural response.In this paper,by analyzing the seismic performance of the Stormproof Playground,an improved wave selection method that controls both the horizontal and vertical ground motion spectrum characteristics is proposed.To evaluate the reliability and effectiveness of different wave selection methods,55 groups of three-way ground motion records are selected according to the preliminary selection conditions.The statistical response spectra of 55 groups of ground motions are taken as the target response spectra,and the mean value of the structure response calculated from the 55 groups of records is used as the"prediction value".Compared with the calculation results of the single-period point and dual-frequency wave selection methods,the results show that the relative errors and coefficients of variation of the structural base shear,column top displacement,support displacement and vertical displacement of the grid calculated by the improved wave selection method are all less than the first two wave selection methods,the results are more reliable and effective.