Seismic Capacity Analysis And Earthquake Damage Prediction Of Rural Houses In Chaganhua Earthquake Area Of Songyuan City

China is one of the countries with the most serious earthquake disasters in the world.The frequent occurrence of earthquakes has brought huge economic losses and tragic casualties to the country.The previous earthquake damage shows that the degree of disaster in rural areas is the most serious,and the uneven quality of houses makes it difficult to guarantee the seismic capacity.Therefore,it is of great theoretical significance and practical value to analyze the seismic performance of existing rural houses.In recent years,the fault activity is strong in the surrounding area of Songyuan City.The frequent occurrence of earthquakes has a serious adverse impact on local houses.In the next few years,there is still the possibility of medium strong earthquakes in this area.Based on the above reasons,this paper analyzes the seismic performance of the rural houses in the Chaganhua earthquake area of Songyuan.Firstly,a two-month field survey was conducted on the current situation of housing in the chaganhua earthquake area,and the characteristics and use status of local rural housing were summarized.The main problems of housing were pointed out and corresponding measures and Suggestions were put forward.Secondly,according to the investigation results,three rural housing models are established by using the finite element software ABAQUS.Based on the material characteristics of masonry structure and the software characteristics of ABAQUS,the constitutive relationship of masonry,reinforcement and concrete are analyzed,the setting of parameters in the model is introduced in detail,and the feasibility of the finite element model is verified.In addition,the modal analysis of the model is carried out to explore the influence of different construction measures on the model period.Thirdly,three actual seismic records are selected,including the earthquake Ms5.8 in Chaganhua earthquake area in 2013.The elastic-plastic time history analysis of the three models is carried out,and the displacement response and damage conditions of the models under the earthquake action are obtained,and the performance level and damage degree of the three models under the earthquake action of different intensities are determined.Finally,according to the survey results,the basic data and conclusions of the completed earthquake damage prediction project in the earthquake area of Chaganhua are taken as the sample source of the database,and seven easily obtained and highly correlated data such as construction quality,mortar grade and housing status are taken as the impact factors of earthquake damage.A BP neural network earthquake damage prediction model based on LM algorithm is trained by MATLAB,which is applied to the local rural houses The earthquake damage matrix of single storey brick buildings in Chaganhua earthquake area is obtained by fast earthquake damage prediction,which aims to provide direct guidance for relevant decision-making departments to carry out disaster prevention,mitigation and relief work.