The Study On Seismic Performance Of Highrise Structure Impacted By Tuned Liquid Damper

With the rapid developing of high-rise structure and the increasing of structureheight, the traditional methods of blindly increasing structure stiffness will no longersatisfy the requirements of the specification on structural control. Structural vibrationcontrol has opened up a new effective way for structural design. Tuned liquid damper(TLD) is a kind of passive vibration control device. It has been widely used in windvibration control of high-rise buildings owing to its simple structure, low cost and highreliability. While the TLD control technology of high-rise structure under seismic actionis not perfect, this paper mainly studies the seismic control of high-rise structureimpacted by TLD.To begin with, this paper analyzes the damping mechanism of TLD. It introducesvarious methods of TLD theory and detailed analysis of the advantages anddisadvantages of these methods. Then it selects the lumped mass method as thetheoretical basis of subsequent analysis. Combined with the dynamic equation ofhigh-rise structure under earthquake load, the structure of TLD system equation isestablished. Then, this paper establishes a practical frame-core wall structure modelusing SAP2000finite element software, which is used to make dynamical andtime-history analysis for the influencing factors of TLD under seismic action. It analysisthe factors to damping effect, such as: mass ratio, frequency ratio, and TLD position.The result of this study shows that with a confirmed frequency ratio and position, theTLD damping rate increases as the mass ratio increases when the value of mass ratio is no greater than3%, or the damping rate will gradually decrease; when the mass ratioand the position are comfirmed, with the increasing of frequency ratio, the changing ofdamping rate shows a similar way with the normal distribution law, and the dampingrate reaches the maximum value when the frequency ratio is about0.88; while the massratio and the frequency ratio are constant, the damping rate of TLD placed at anintermediate position is higher than in other locations. What’s more, this study alsoanalysis the damping rate of the rational designed TLD in different intensity regionswhen TLD is used in practical application. The results reveals the damping rates of thesame structure which controls by using the TLD in different intensities are different, andthe damping rate of the high intensity zone would be larger. Especially in the area of8degrees (0.2g), the damping effect of TLD can play a relatively lower seismic intensityand improve the effect of structural seismic performance. Finally it makes a mainconclusion of this study, and proposes some suggestion of the actual design applicationand problems which need further research.