设备-结构动力相互作用振动台试验方法研究

为了合理评估设备与结构的抗震性能,开展设备-结构动力相互作用振动台试验方法研究。按照分支子结构方法推导设备-结构动力相互作用运动方程,提出了考虑设备-结构动力相互作用振动台实时子结构试验方法,该方法将设备作为试验子结构由振动台加载同时结构作为数值子结构由仿真软件计算联合进行振动台试验,能够考虑设备-结构相互作用对设备抗震性能的影响。设计了四层的钢框架设备-结构动力相互作用缩尺模型,进行各地震动作用下的振动台实时子结构试验与传统整体振动台试验。通过比较发现两种试验方法得到的结果基本吻合在一起,证明提出的振动台实时子结构方法是可靠有效的。试验分析表明忽略设备-结构动力相互作用将影响结构或设备真实的地震反应,特别是对于设备反应的影响更显著。

Shaking table test method for equipment-structure dynamic interaction

Here,shaking table test method for equipment-structure dynamic interaction was investigated to reasonably evaluate the aseismic performance of equipment and structure.Firstly,adopting the branch substructure method,the equip-structure dynamic interaction motion equation was deduced.A shaking table real-time substructure test method for equipment-structure dynamic interaction was proposed.With this method,the equipment was taken as the test substructure loaded by the shaking table and the structure was taken as the numerical substructure calculated using simulation software to jointly conduct shaking table tests and be able to consider effects of equipment-structure interaction on the equipment’s aseismic performance.A 4-floor steel frame equipment-structure interaction scaled model was designed,and the shaking table real-time substructure test and the traditional whole shaking table one were conducted for the model under different earthquake excitations.Comparing the two test results showed that they agree well with each other;the validity of the proposed shaking table real-time substructure test method is verified;ignoring the equipment-structure dynamic interaction affects the actual seismic responses of structure and equipment,especially,the latter is affected more significantly.