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适当考虑结构对于地面运动随机过程的影响,将结构影响因子β(T)引入谱密函数表达式中,得到一种修正的随机地震动模型,并对该模型中的关键参数进行了详细研究及数值计算。结果表明,根据规范谱等效原则标定的结构影响因子物理意义明确、应用方便;由修正模型得到单自由度体系加速度反应均值谱与现行规范谱吻合良好。提出的模型具有较高的精度及广泛的应用前景,为结构随机地震反应分析及动力可靠性设计提供了可靠的依据。
Considering the effect of structure on the stochastic process of ground motion, the structural influence factor β (T) is introduced into the spectral density function expression. A modified stochastic ground motion model is obtained and the key parameters of the model are studied in detail. Numeral Calculations. The results show that the structure influencing factors calibrated according to the principle of equivalent spectrum of the spectrum have a clear physical meaning and are easy to be applied. The mean value spectrum of the acceleration response obtained from the modified model is in good agreement with the current standard spectrum. The proposed model has high accuracy and wide application prospect, and provides a reliable basis for random seismic response analysis and dynamic reliability design of structures.