Seismic Recording Amplitude Modulation Method And Vulnerability Study Of Frame Shear Wall Structure

In recent years,with the continuous development of computer technology,the use of time-history analysis methods to calculate the response of structures under earthquake has increasingly become the focus of research.At present,there is no clear and effective scaling method for the ground motion records used in the time-history analysis at home and abroad.It can be seen that seek for the scaling method of ground motion recording has been of important theoretical significance and practical application value.Based on the scaling method proposed in this paper,seismic vulnerability analysis is performed on the reinforced concrete frame shear wall structure,the damage probability of the structure under various damage conditions is obtained,and it is helpful to quickly assess the damage degree of the structure under earthquake action.Verify the correctness of the proposed method.The main research contents of this paper and the research results obtained are as follows:（1）Using the OpenSees finite element analysis software,the 5 floor and 11 floor frame-shear models were respectively subjected to elastoplastic time history analysis under the records of Kalkan 39 and SAC 20 ground motions,mainly to study the response of structures under different ground motion records.And verify the correctness of the model.（2）Based on the 5 floor and 11 floor frame-shear model,using ASCE,MIV,PGA and Sa（T₁）four ground motion recording amplitude modulation methods,the effectiveness and degree of dispersion of various scaling method are compared and analyzed.The results of the study show that the MIV-based method of the scaling for ground motion recording has better comprehensive evaluation than other scaling methods,and its dispersion is small.（3）Using MIV and PGA as the ground motion intensity parameters,the peak inter story drift is used as structural damage index to perform incremental dynamic analysis on the structure,and the discreteness of IDA analysis under the two indexes is evaluated.The results show that IDA analysis based on MIV ground motion intensity parameters is less discrete.（4）A logarithmic regression analysis of the IDA data was used to establish the structural vulnerability curve.Based on this,the probability of structural minor,medium,severe damage,and collapse under different ground motions was evaluated.According to this result,evaluating degree of damage of the structure.