Seismic Safety Analysis Of Highway Bridges Based On Midas/civil

With the rapid development of urbanization in China,the seismic safety of urban building system and bridge engineering will face the natural test when earthquake occurs.As a bridge project of lifeline engineering in urban traffic,its seismic safety is also very important.If the bridge is affected by earthquake damage and can not meet the use conditions,it will cause traffic interruption and delay the implementation of transportation and personnel rescue work.However,for earthquake disasters,it has the characteristics of sudden,instantaneous,uncontrollable,heavy casualties and secondary disasters,making the earthquake unable to capture.At present,the construction standard of highway bridges in our country is "not bad in small earthquakes,repairable in medium earthquakes,and not collapsed in large earthquakes".However,when many bridges are designed,they have not investigated the local conditions and can not be designed according to the local conditions,which leads to problems in the design process of many bridges.Therefore,it is very meaningful to use computer software to model the structure,simulate the local seismic intensity design response spectrum,conduct seismic experiments on the structure,and explore the safety of the structure under earthquake action.Taking yusong expressway K183+293 overpass in ningjiang district of songyuan city as the background,this paper uses finite element analysis software Midas/Civil to build the bridge model.According to the seismic design specification,E1 seismic response spectrum and E2 seismic response spectrum are generated according to the seismic intensity table in China by using the response spectrum analysis method.According to the code of seismic design,E1 and E2 seismic response spectra are generated by response spectrum analysis method according to the seismic intensity table of China.Thus,the seismic force analysis of the whole bridge under the condition of E1 earthquake and E2 earthquake is carried out.Internal force checking including bridge beam,pier and pile foundation,strength checking under small earthquake,strength checking under medium earthquake and elastic-plastic checking,and displacement checking under large earthquake are included to analyze the safety of bridge.