【摘要】 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,该理论正确,方法可行,对地震模拟振动台试验系统的发展有实际意义。更多还原

【Abstract】 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 was introduced. The dynamic balance analysis on the substation of the system was carried out according to the d’Alembert’s principle,and a theoretical analysis model of the shaking table extended system was established. The key parameters of dynamic equations were determined reasonably by considering the dynamic effect of upper structure on sub-station in the process of vibration analysis. The multi-point incentive study was achieved by varying system parameters. The shaking table extended system was designed and produced. The test results show that,the time lag effect and growth effect of the system sub-station response are significant. The test and numerical examples show that the theory is correct and the method is feasible. The results are of practical significance for the improvement of earthquake simulation shaking table test devices and the development of extended systems.更多还原