Study On TLD Vibration Reduction For Frame Structure

Due to the rapid development of economy and technology in recent years, people are concerned about the strength of all types of structures under static load, but also increasingly caring about the safety, reliability and comfort of structures under seismic, wind loads and other dynamic effects, structural vibration technology thus gradually become a hot research field of structural engineering. Because of the unique advantages of TLD damping technology, scholars began to study it as early as the 1970 s, but the scope of the study has been mostly limited in TLD vibration control of flexible structures under wind and earthquake load, little regards to the structures of fundamental frequency 3～5Hz. Generally speaking, the fundamental frequency of frame structure will be distributed within this range. Therefore, this thesis focuses on the study of the TLD damping control for frame structure, and the research methods include theoretical analysis, numerical simulation and experimental research. Research work in this thesis are mainly the following four aspects.1) Established a fixed-point design method for TLD. This thesis used Housner equivalent model and finite element simulation technology, also considerd that the frame structure is a multi-DOF system, and the effect of structural damping, to sum up the principles and steps for fixed-point design method, and the method is extended to higher-order structure vibration control.2) Based on structural vibration finite element analysis theory, simulating the TLD- structure interaction process by ANSYS software, investigating the damping effect of TLD on frequency and mass ratios. And by using the condition of fixed point theory, finding the optimal frequency ratio by approaching.3) Designed and produced a five-story frame structure, measured the fundamental frequency of the structure by shaking table test. Based TLD fixed design method, produced two kinds of TLD devices, and placed them on the top of the structure, compared to the top-level’s displacement and acceleration response under sine sweep test, test results show that TLD can play a significant damping effect.4) Selected a six-layer school buildings of frame structure that actually exists, built its finite element analysis model according to the plane and elevation figures,based on the fixed point method, to design a set of TLD devices. The TLD is arranged on the top of the structure, were studied the damping effect for the first order vibration under harmonic excitation and seismic excitation, the simulation results show that TLD can inhibit its top acceleration and displacement response, to provide a reference for practical engineering application.