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考虑地震动的随机性及频率和强度非平稳性,利用作者所提出的基于强度和能量控制的随机地震动模型,建立了非平稳随机地震反应分析方法。以某特大型桥梁群桩基础为研究对象,将群桩-土-桥墩结构体系作为一个整体进行了特大型桥梁桩基非平稳随机地震反应分析。首先,基于目标加速度时程的强度和能量信息确定了作为输入的加速度时-频演变功率谱密度;其次,分析了非平稳随机过程激励下自由场和桥梁桩基相互作用体系的地震反应,探讨了非平稳随机过程激励下的群桩-土-桥墩结构动力相互作用;最后,通过比较强度非平稳随机过程和完全非平稳随机过程激励下桥梁桩基相互作用体系的地震反应,探讨了频率非平稳性对相互作用体系地震反应的影响。
Considering the randomness and non-stationary frequency and intensity of ground motion, a nonstationary random seismic response analysis method is established by using the random ground motion model proposed by the author based on strength and energy control. Taking the pile foundation of an extra large bridge group as the research object, the non-stationary stochastic seismic response analysis of the pile foundation of the super large bridge is carried out by using the pile-soil-bridge piers structural system as a whole. Firstly, based on the intensity and energy information of the target acceleration time-history, the time-frequency power spectral density of acceleration as input is determined. Secondly, the seismic responses of free-field and bridge pile-foundation interaction under non-stationary random process excitation are analyzed. The dynamic responses of pile-soil-bridge piers excited by non-stationary stochastic processes are discussed. Finally, by comparing the seismic responses of pile-foundation interaction under strong non-stationary stochastic processes and completely non-stochastic stochastic processes, The Influence of Stationarity on the Seismic Response of Interaction System.