Comparative Seismic Performance Analysis Of High-rise Buildings Before And After Considering The Calibration Of Infill Wall

Infill walls,as a non-structural component,affect the overall seismic performance of the structure to a large extent.However,the interaction between the infill walls and the structural components is very complex,and the infill walls show a high degree of nonlinearity and a great uncertainty under earthquake.In this paper,the finite element models of the high-rise building structures was calibrated by the results of ambient vibration test of the high-rise building structure,and high-rise buildings including frame-shear wall structure and shear wall structure.Based on the calibrated finite element analysis models,the influence of the infill walls on the seismic performance of the high-rise building structure was discussed,including the analysis of the elastic phase under the frequent earthquake,the analysis of the elastic phase under the large earthquake and the Incremental Dynamic Analysis(IDA).The main contents are as follows:(1)A brief introduction to a high-rise building ambient vibration test project in Laibin,and different pre-and post-processing techniques were utilized for ambient vibration signal analysis,from which the modal parameters of ten high-rise buildings were obtained using three OMA techniques.Then,based on 25 proposed empirical equations,the fundamental periods of 10 buildings were calculated and are compared with the measured period.(2)Four of the ten high-rise buildings were selected and built in Sap2000,and the calculated values are compared with the PKPM calculated results.Then,the shell model is used to simulate the infill walls in Sap2000,and the Sap2000 model is calibrated by the measured modal parameters.Seismic analysis was carried out using the calibrated Sap2000 model and compared with the PKPM seismic analysis results.The effects of infill under the linear elastic stage of frequent earthquake on seismic analysis of structures were discussed.(3)The nonlinear dynamic time history analysis of the four high-rise buildings is carried out.The element models of frame beams,columns,shear walls and coupling beams are introduced,and the calculation formulas of constitutive relation of infill walls were introduced in detail.The skeleton curve of the infill walls was modified by the measured data,and then the nonlinear analysis model which considering the infill walls is obtained,by adding equivalent strut in Perform-3D.The dynamic time history analysis of four high-rise buildings with two types of models is carried out.The influence of infill walls under the nonlinear phase of strong earthquake on the seismic analysis of structures is discussed.(4)The basic principles and implementation steps of incremental dynamic analysis(IDA)were briefly introduced,and ten seismic motion record were selected for IDA analysis of two finite models of Bei An Ya Ge2#,and one considers the effect of infill walls and the other was not.The fundamental period reduction factor is considered in two ways for the model without considering the infill wall,and three kinds of IDA curve clusters are obtained.Then,the performance level of frame shear wall structures under different failure states is quantified,and the performance evaluation of the three IDA curve clusters is carried out.The influence of infill walls on the seismic behavior of structures in the completely process of structural damage is discussed,and the influence of different consideration modes of the infill wall on the performance curve is also compared.