Study On Seismic Performance Evaluation And Evacuation Of Community Buildings In High Intensity Earthquake Area

Yunnan Province is located in the southeast of the collision zone between the Indian plate and the European plate.The crustal movement is intense,with the characteristics of high frequency,high intensity,wide distribution,shallow source and heavy disaster.According to statistics,the most serious structural type of earthquake disaster in Yunnan Province is the self built masonry structure in urban villages.Most of the self built masonry structures have not been formally designed,the vertical and horizontal walls are lack of connection,and the integrity of the houses is poor.The self built houses of villagers have not been treated,and the cracks and inclinations of the houses are caused by the liquefaction of sand and uneven settlement of the foundation.The self built houses are caused by the covered floors The ratio of height to width is more than 2.0,which is not in accordance with the seismic design code.This series of phenomena show that the seismic performance of the buildings in urban villages is poor.In addition,the buildings with large population,high density of people and lack of safe passage can not meet the requirements of evacuation speed and flow during emergency evacuation.Once a strong earthquake occurs,the buildings in urban villages will not only collapse,but also cause huge casualties and property losses.Therefore,on the one hand,it is necessary to evaluate the seismic performance of the buildings in urban villages to determine how large the earthquake will affect the safety of residents.On the other hand,it is necessary to carry out earthquake evacuation research,which combines seismic performance evaluation with earthquake evacuation to formulate a reasonable earthquake emergency plan and reduce casualties.Taking dashuying village in Kunming City as the research object,this paper makes a detailed investigation on the building structure,traffic roads,population distribution and seismic facilities of dashuying village,so as to determine the evacuation safety area when the earthquake occurs.With the help of questionnaire survey,the individual indicators of residents in dashuying village and other parameters related to earthquake evacuation were obtained,which provided corresponding data for the following evacuation simulation,and its validity and reliability were verified by SPSS.The incremental dynamic analysis of five typical residential buildings is carried out by using SAP2000 finite element software.The collapse probability and collapse time of residential buildings under 8-degree earthquake and 8-degree rare earthquake are obtained,and the available safe escape time aset of residents is determined.The casualty rate of five residential buildings is predicted based on pack software in femap-58.The evacuation environment of five residential buildings is established based on the pedestrian bank model in the anylogic software.The earthquake evacuation simulation is carried out based on the improved social force model,and the required escape time RSET of residents is obtained.The casualty rate is obtained by comparing aset and RSET.Finally,the evacuation simulation of dashuying village under the overall earthquake is carried out,and the casualties of the whole villagers under the 8 degree fortification earthquake and 8 degree rare earthquake are obtained.It has a certain guiding significance and reference value for the formulation of earthquake evacuation emergency plan for urban villages.