Seismic Vulnerability Analysis Of SRC Frame-RC Core Wall Hybrid Structure In High-rise Buildings Based On The IDA Method

In the past ten years,high-rise building and super high-rise building have sprung up.SRC Frame-RC Core Wall Hybrid Structure,as a basic structural system for urban and industrial high-rise buildings,the earthquake disaster experience of this kind of structure is less.Therefore,the seismic performance evaluation and vulnerability analysis of this kind of high-rise mixed structure have been paid much attention by scholars.In this paper,seismic vulnerability analysis based on IDA method is carried out to investigate the earthquake resistance and the probability of damage at different levels of earthquake.It provides some reference for the performance-based seismic design of mixed structure.(1)This paper selects the ground peak acceleration PGA,the ground peak velocity PGV and the spectral acceleration Sa corresponding to the first period of the structure as the ground motion intensity index.The maximum interlayer displacement angle is selected as the structural performance index,and the seismic waves of eight class ? sites are selected.In this paper,30 layers of steel concrete mixed structure is selected as the research object,the model is established by SAP2000 V19.After more than 180 elastoplastic dynamic time history analysis,the method of quantile curve and conditions are used.The validity of the three parameters is compared and analyzed by two methods of logarithmic standard deviation.The results show that the IDA curve discreteness obtained by PGA as a ground motion intensity index is more accurate and more effective to evaluate the seismic performance of this kind of structure.(2)The semi probabilistic analysis method is used to calculate the vulnerability curve and matrix of the structure.The analysis data show that the probability of exceeding the normal use limit state of the structure under the 8 degree small earthquake is 12.51%,the other four limit states surpass the probability of 0,and the limit state probability of exceeding the basic availability under the 8 degree of earthquake is 82.53%,and 3.is 3.The probability of 22%can reach the limit state after repair.In this case,it will not harm life.The probability of exceeding the life safety limit state under the action of 8 degree earthquake is 8.73%,the probability near the collapse is only 0.01%,and it has good seismic performance.(3)The site category is class ?,and after more than 180 elastoplastic dynamic time history analysis,the change of structural vulnerability curve under class ? and class ? site conditions is compared.The results show that the category of site soil is changed from class? to class ?,the maximum interlayer displacement angle of this kind of structure is significantly increased,and the class ? site is more likely to surpass ? than ? as a whole.The limit state of the class site,in which the probability of exceeding the normal use of the 8 degree small earthquake increases from 12.51%to 63.97%,and the probability of exceeding the basic available limit state is increased from 82.53%to 94.48%under the 8 degree medium earthquake,and the probability of exceeding the life safety limit state is increased from 8.73%to 15%under the action of the 8 degree earthquake,indicating weakness.The site soil has obvious amplification effect on ground motion,which makes the seismic effect more significant.