Vulnerability Analysis Of Group Buildings And Earthquake Loss Fast Estimation

Wenchuan earthquake caused huge casualties and economic losses, The damage to housing construction accounted for a large proportion. In recent years, focus of the study question is how fast and accurate understanding seismic capacity of group building and post-earthquake losses in urban areas. Vulnerability analysis of building structures is an important component of earthquake loss estimation .It has important practical significance for various cities and regions to develop reasonable earthquake disaster mitigation planning and emergency response. This paper studies the following aspects:(1) The choice of vulnerability analysis method has significant impact on the results of earthquake loss estimation. Therefore, this paper studies the correlation between seismic peak acceleration and damage indices of sructure from the perspective of the relevance of random variables. A case study of the masonry and frames select different damage indices. Studies have shown that peak ground acceleration values have best correlation with transcendence intensity rate for the masonry and have better correlation with inter-story drift ratio for frames.(2) This paper studies total probabilistic seismic risk analysis of single and group buildings. The used method that is simple and practical can be used to assess the comprehensive seismic capacity of cities in China. Seismic vulnerability analysis adopts peak ground acceleration as earthquake input and considers the uncertainty of ground motion parameters. Finally the probabilistic results of seismic damage to the structure in design reference period can be acquired. A case study of the masonry with constructional columns verify the accuracy of the method.(3) This paper focuses on the group vulnerability of buildings and puts forward a new fast evaluation approach of group vulnerability for post-earthquake. Impersonal weight determination by entropy method and similarity theory in fuzzy mathematics are introduced in group vulnerability analysis, which can evaluate earthquake disaster of group buildings rapidly and reliably. Group vulnerability analysis method presented in the paper is applied in masonry and frames. By studying the seismic capacity similarity of typical known monomer and unknown monomer,Further vulnerability result of unknown monomer is obtained by the vulnerability of the typical monomer. Finally the result of group vulnerability can be obtained by statistical analysis.(4) This paper combines structural vulnerability analysis with performance-based seismic design concept. It can assess the seismic performance of existing buildings. In addition, the economic losses caused by the earthquake have been studied. A direct economic loss model which considers structure of different uses is proposed. Finally it can obtain the assessment of total cost of structures during the whole life-cycle and provide reference for the application performance-based seismic design.