Research On The Influence Of TLD On The Seismic Response Of Middle-Story And High-Rise Structures

Tuned liquid damper(TLD)is a typical effective passive vibration control device to control structural vibration under wind and earthquake loads.At present,TLD is often used to control the first mode of structure.So in frequency domain,the design theory of TLD is often based on single-degree of freedom(SDOF)system,and this theory is unable to evaluate overall seismic performance of multi-degree of freedoms(MDOFs)installed TLD.In order to evaluate the influence of TLD on structural seismic response,the main work of this study is as follows:(1)A transfer function for TLD controlled MDOFs system in frequency domain is established on substructure thought to evaluate overall seismic performance of MDOFs installed TLD.The accuracy of the transfer function is verified by a real-time hybrid testing system.Using this transfer function,the damping performance of TLD with different parameters in frequency domain evaluated indirectly.The simulation results show that the larger the mass ratio is,the more obvious the acceleration damping ratio is.(2)In this work,a real-time hybrid testing system is established for evaluating seismic performance of high-rise building installed TLD.Using this testing system,a series of sinusoidal excitation tests were conducted to evaluate the damping performance of TLD with different parameters in frequency domain indirectly.The influence of excitation frequency ratio,TLD frequency ratio,mass ratio,structure damping ratio and excitation amplitude on the seismic performance of TLD-installed high-rise building are discussed respectively.The results show that TLD is more suitable for controlling the resonance response components of structures with small damping ratio,and has poor damping effect on components far away from the specifically controlled natural frequency of structures,and may have great adverse effects on the frequency components less than the natural frequency of structures.(3)Using this transfer function,the damping performance of TLD with different parameters in frequency domain evaluated indirectly.The design method for TLD to control multi-mode is also developed in this thesis to solve the low damping efficiency with large mass ratio under the single-mode control method.For displacement,the seismic performance under both design method is similar.(4)Seismic wave excitation tests were carried out on the structures representing the dynamic characteristics of middle and high-rise buildings.According to the test results,the failure probability of the structure affected by different parameters in different failure states was qualitatively predicted.The results show that the influence of TLD on the nonlinear stage of structural response is discrete due to the narrow damping frequency band of TLD.