Study On Earthquake Disaster Risk Assessment In Southern Sichuan Based On Building Vulnerability Localization

In recent years,moderate and strong earthquakes occur frequently in southern Sichuan,constantly breaking through the previous understanding of the risk level of earthquake disasters in this area.Under the background that the earthquake situation in the future is still severe,this paper realizes the evaluation of earthquake disaster risk in this area based on the localized building vulnerability analysis results in southern Sichuan,so as to master the base number of earthquake disaster risk for the local government,Provide scientific reference for building related earthquake disaster risk prevention and management,and help improve its earthquake disaster risk management level.The main research contents of this thesis are as follows:1.Based on the existing field investigation data of buildings in southern Sichuan,this thesis investigates the structural types and characteristics of main buildings,and further grasps and analyzes the basic current situation of various buildings.By collecting the historical earthquake disaster assessment report in southern Sichuan,sort out the data related to the earthquake damage of buildings,correspond to the structural types of main buildings,classify and summarize the main failure forms and characteristics of various structures,analyze the failure mechanism in combination with the structural characteristics of different buildings,and obtain the earthquake damage characteristics of various structural buildings in southern Sichuan.2.From the data related to the seismic damage of buildings in the historical earthquake in southern Sichuan,the investigation results of the damage ratio of main buildings are extracted,and the corresponding seismic damage characteristics of various structural buildings are integrated to obtain the ratio of different damage levels of each type of structural buildings under various intensities.According to the damage situation,the empirical seismic damage matrix of various structural buildings is obtained by using the empirical analysis method.Aiming at the problem of incomplete empirical seismic damage matrix,the empirical seismic damage matrix is improved by numerical simulation,and the localized vulnerability analysis results of various structural buildings are obtained.3.Using the seismic disaster risk assessment method based on statistical analysis,under the condition of magnitude 6.0 earthquake,according to the localized building vulnerability analysis results,quantitatively evaluate the local building damage,casualties and economic loss risk,grade each index parameter through the standard deviation classification method and give corresponding values to obtain the above three types of loss risk levels,For the above results,the weighted superposition method is used to comprehensively stack each type of risk loss to further obtain the comprehensive earthquake disaster risk.Finally,the classification method of distance from standard deviation is used to classify the risk of each administrative region,and the distribution map of earthquake disaster risk level in each administrative region is obtained.