The Research On Vibration Control Of Tuned Liquid Damper Used In High-rise Buildings

Tuned liquid damper (TLD) as a passive device of the control which has been widely used on the building structure achieves well control effects in the practice of wind vibration. The complexity of ground motion led to the imperfection in this research, and there are still many problems to be resolved.The vibration regularity of TLD was researched by analyzing the finite element model of TLD-structural system. The finite element method was used to model fluid-structure interaction of TLD, and damping mechanism of fluid-structure interaction tank was analyzed. It was found that the structure with the small natural vibration frequency (less than1s) and big dead-weight did not favor the TLD application. Generally speaking, this structure will lead to excessive water mass and numerous water tanks, increasing the construction cost consequentially.The Housner simplified model and fluid-structure interaction model were built respectively by using ABAQUS. It was verified that the model of fluid-structure interaction was reliable.Studying the damping factors of TLD based on the earthquake to analyze the damping regularity of TLD. Different working condition was designed. It was founded that The damping effect of displacement on the top of structure was better with water quality increasing at a constant frequency ratio. The vibration reduction rate could reach15%to30%when the mass ratio varied between1.5%and3%. When the sloshing frequency of water in the tank on TLD system closing to and slightly less than the frequency of the building slightly. Control effect of TLD system reached Optimization. The result was good when the predominant period of seismic waves approached to the period of structure’s natural vibration frequency. But, it was bad for the whole structure to resistance to the vibration. The damping effect was the optimal when the TLD water tank coincides with the center of the structure. The TLD system structure was designed through original fire water tank. It was founded that on the top of structures in different seismic level of displacement time history response TLD system at the top of structure subjected to earthquake displacement had good shock absorption protection. It can also be realized in implemented earthquake. Compared with the conventional vibration energy dissipation devices, TLD system under seismic action can provide a continuing damper. It can automatic recovery after the earthquake, its usefulness is unmatched by conventional vibration energy dissipation device.