HYBRID EXPERIMENT ON NONLINEAR EARTHQUAKE-INDUCED SOIL-STRUCTURE INTERACTION

通过在线计算机对控制微分的数值分析，对非线性地震土-结构相互作用进行了混合研究。在此分析过程中，系统刚度的非线性通过伪动态测试进行实验测量，并在每个连续步骤反馈到计算机。对系统的其他动力特性进行了分析处理。我们采用了浅基础、预埋基础、沉箱基础、1桩、2桩、3桩和9桩模型等7种大型基础结构模型。还使用了不同的地震输入激励和各种不同的最大振幅。通过静态和强迫振动动态试验确定了土壤结构模型的静态和动态力学特性。在制定运动的动态方程时，考虑了通过这些测试测量到的与频率相关的动态特性。我们开发了一种新的时域数值积分方案，该方案基于土壤结构系统频率相关动态特性的希尔伯特变换。最后，我们使用卡尔曼滤波技术确定了迟滞恢复力和参数。

A hybrid study has been made of nonlinear seismic soil-structure interaction by numerical analysis of the governing differential by on-line computer. During this analysis the nonlinearity of stiffness of the system was measured experimentally by Pseudo-dynamic Test, and fed back to the computer at each successive step. The other dynamic characteristics of the system were treated analytically.We have used seven large foundation-structure models, which are shallow foundation, embedded foundation, caison foundation, 1-pile, 2-pile, 3-pile and 9- pile models. Also different seismic input excitations were used with a variety of different maximum amplitude.Static and dynamic mechanical characteristics of soil-structure model were determined by Static and forced vibration Dynamic Tests. Frequency dependent dynamic characteristics measured through these tests were taken into account formulating dynamic equations of motion. We developed a new time domain numerical integration scheme that is based on the Hilbert Transformation of frequency dependent dynamic characteristics of the soil-structure system. Finally, we identified hysteretic restoring force and parameters using Kalman filter technique.