Research on the disaster prevention mechanism of mega-sub controlled structural system by vulnerability analysis

Abstract

The mega-sub controlled structural system (MSCSS) is a new structural system that combines structural response control theory with the construction principle of mega frame structure (MFS), and has significant response control effects. It is of practical significance to study the method which accurately evaluate the seismic vulnerability of structures. In this paper, Multiple Stripes Analysis (MSA) and Incremental Dynamic Analysis (IDA) are used to evaluate the vulnerability of MSCSS structure. The comparison between these two methods certify the accuracy of MSCSS vulnerability evaluation along with the impact of the number of stripes used in MSA method. In addition, through the comparative analysis of structural vulnerability analysis results, it is found that under limit state LS4, the failure probability of MSCSS is 30% lower than that of MFS, and the exceeding probability of megastructure is 50% lower than that of substructure, indicating that MSCSS structure has advanced disaster prevention design concept. Afterward, by introducing the seismic damage index used for regional structural seismic damage assessment into the vulnerability assessment, an intuitive seismic risk assessment method for buildings is anticipated by combining the seismic damage index and the beta distribution function, which can provide a reference for the risk assessment of super high-rise buildings.