地震模拟振动台扩展系统理论分析及试验研究

为利用单振动台进行空间大跨度结构动力试验，提出地震模拟振动台扩展系统概念。根据达朗贝尔原理对系统子台进行动力平衡分析，建立振动台扩展系统理论分析模型，通过考虑振动过程中上部结构对子台的动力影响，合理确定动力方程关键参数，改变系统参量可实现结构多点激励研究。设计并制作振动台扩展系统,试验结果表明，系统子台反应有明显时滞、增幅效应。试验及算例表明，本文理论正确，方法可行，对地震模拟振动台试验系统的发展有实际意义。

Theoretical and Experimental Research on the Seismic Simulation Shaking Table Expansion System

In order to conduct the spatial large span structural dynamic tests by using a single vibration table，the concept of seismic simulation shaking table extended system is put forward. Dynamic balance analysis of sub-station on the system was conducted according to the d’Alembert’s principle, theoretical analysis model of the shaking table extended system was conducted. The key parameters of dynamic equations was determined reasonably by considering the dynamic effect on sub-station from upper structure in the process of vibration, multi-point incentive study can be achieved by changing the system parameters. Shaking table extended system was designed and produced. The test results showed that, the time lag effect and growth effect of the system sub-station response was significantly. Test and numerical examples showed that the theory is correct, the method is feasible, it has practical significance for the reformation of the earthquake simulation shaking table test device and the development of the extended system.