Seismic Capacity Analysis of Typical Masonry Structures in Urban Area of Zhejiang

LU Jiyun; GU Luoyi; SHI Shuzhong

doi:10.13512/j.hndz.2025.02.15

Abstract：In order to study the seismic capacity of old masonry buildings widely distributed in Zhejiang urban area,this paper takes a typical multi-story masonry building which does not meet the requirements of the current seismic design code as the object,and uses the seismic capacity index method and time history analysis method to analyze its seismic capacity.The results of the seismic capacity index method show that the average seismic capacity index of the middle floors of the masonry structure is relatively low,which can be preliminarily judged as the seismic weak link of the building.The results of time history analysis show that under the action of small earthquake,medium earthquake and large earthquake with seismic fortification intensity of 7 degrees(0.10 g),the highest inter-story displacement angle occurs mainly on the second floor(in the X direction).Based on the three design seismic accelerations,five seismic acceleration time histories that meet the characteristics of the engineering site are selected for structural numerical simulation analysis.It is concluded that the average inter-story displacement angles of the building are 1/1356,1/408 and 1/230,respectively.According to the classification of earthquake damage to buildings and special structures,the damage state of the masonry structure is slight damage,medium damage and serious damage.The analysis results of the two methods are in good agreement,and the seismic capacity level of the typical masonry structure is preliminarily determined.