Study On Damping Property Of High-rise Frame-supported Shear Wall Structure In View Of Shaking Table Test

In the past two or three decades,the high-rise buildings can be seen everywhere in the various parts of our nation with the rapid development of the construction. The increasing of the building height,not only makes the structural design and construction more complex and more difficult,but also promotes the constant development in the structure theory and software.The wind or seismic load in the calculation of high-rise building is of a major the load case,which it plays a leading role for the building's ability to resist disasters.However,as the structural damping parameters has a greater impact in terms of the structural calculation,and they will constantly vary with the development of the structure from the elastic stage to the elastic-plastic stage,the role of structural damping in engineering is also becoming more and more important,but in a long time,the value of the damping ratio can't be well solved.In this paper,Based on a 1:25 high-level frame-supported shear wall structure model's test data of the shaking table and several damping theories,the various influencing factors are analyzed,which influence structural damping,then on the basis of experimental modal analysis theory,the dynamic properties of model parameters(including damping ratio) are calculated by the use of MATLAB software programming.Finally on the basis of the results of analysis,the empirical formula of the damping ratio is fitted,and the structural finite element software confirms the results.The main contributions of this paper are as follows.1) Finished the collection of a large number of buildings,structural components and building materials damping ratio data or experimental data,this paper starts from the development process of the building seismic design theory,and the important role in the seismic design is discussed about the performance of damping in the buildings.At the same time,the development of structural damping theory and results are studied.2) Each factor that has effected on the structural damping is analyzed.The authentic measured data from the factual structures and mathematic method is applied,and the effect of different measuring method on structural damping is also discussed.3) The test characteristics of the structural model,the scope of application and the theoretical basis are discussed,including the similarity theory and dimensional analysis methods,etc.At the same time,the engineering model design,model similarity coefficient,modeling and material properties were made to explain.4) The development process of the modal experiments and parameter identification,the type of.modal analysis are introduced in this paper,then the characteristics of the experimental modal parameters frequency domain identification and time-domain identification methods are analyzed specifically.In accordance with the actual situation in this paper the time-domain identification method was chosen as the theoretical basis of experimental modal parameter identification.5) Through the use of MATLAB software which deals with the engineering experimental data on the basis of time-domain theory(including the least squares method that eliminates the trend,the random decrement method,STD identification method,and the identification procedures of relative displacement),the modal parameters,about damping ratio,frequency,relative displacement,etc,have been required under the various level seismic acceleration in order to comprehensively analyze the damping ratio of this model and study its changes.Then the damping ratio formula is fitted in according to those parameters and the error is analyzed for the formula results through SATWE finite element structural analysis software.6) Finally,in this paper all the results of research are summarizes and the further study suggestions are provided.