TLD振动台子结构试验的数值仿真分析

Numerical Simulation of Substructure Shaking Table Test with Tuned Liquid Damper

本文采用振动台子结构试验数值仿真验证了圆柱形调谐液体阻尼器(CTLD)控制建筑结构地震响应的性能。振动台子结构试验将结构模型作为数值子结构在计算机中计算,将CTLD作为试验子结构进行物理试验。在CTLD和振动台之间安装剪切力检测装置,将测得的剪切力和地震波输入到数值子结构中,采用实时子结构中心差分法进行数值子结构运动方程的求解,计算得到了结构顶层的绝对加速度。再将加速度由振动台实时加载到试验子结构上,实现了结构和CTLD的相互作用。对一个单自由度结构有CTLD控制和无CTLD控制时的加速度响应进行了精确数值求解,结果验证了CTLD能够有效地控制结构在地震作用下的加速度响应。用振动台子结构试验对CTLD与结构耦合系统进行仿真,得到的加速度响应与精确数值求解的结果吻合较好,验证了这种方法能够准确地评估CTLD的减振性能。

Substructure shaking table method was applied for evaluating the seismic performance of a circle tuned liquid damper in a structure. The CTLD was chosen to be the experimental substructure tested physically, and the other structures were chosen to be the numerical substructures simulated in a computer. The seismic wave and the shear force measured by the sensor installed between the shaking table and the CTLD were input to the numerical substructure. With the central difference method for Real-time substructure testing considering specimen mass, the absolute acceleration at the top lay of the structure was calculated. This acceleration was enforced to the experimental substructure in real-time by shaking table in order to realize the interaction between the CTLD and structure. It is shown from pure numerical simulations for a SDOF system with and without CTLD control that the CTLD can effectively control the acceleration response of a structure. Then, Numerical simulations with the substructure shaking table method for a SDOF system with control were conducted and the results show that the acceleration response matches the pure numerical simulation result very well. This means that this method can effectively evaluate the seismic performance of the circle tuned liquid damper.