Seismic Response Analysis Of Langzhuo Intercity Railway(72+128+72)m Continuous Beam Bridge

As the continuous economic development,the transportation mode has undergone tremendous changes.The important transportation mode for people to travel has changed from ordinary trains to high-speed railways.High-speed railways require multiple straight lines or as straight lines as possible to reduce speed reduction.Building bridges when crossing mountains and river valleys has become an important part of constructing transportation routes.The strength of the prestressed concrete beam is higher.The larger the bridge span,the more the bridge saves materials,and the durability of the structure is improved.The box beam section improves the torsional rigidity of the bridge section and has better integrity.Therefore,in the task of designing a bridge,it is necessary to calculate the seismic capacity of the bridge.The construction model of the newly built Langzhuo Intercity Railway(72+128+72)m continuous beam bridge,using the finite element software Midas Civil / 2019 to simulate the bridge force,analysis and discussion,the main work is as follows.:(1)Starting with the destruction of bridges caused by earthquakes,discuss the impact of earthquakes on bridges,and compare various anti-seismic theories and methods.(2)The bridge model with pile foundation and the model with only pier foundation were constructed respectively,and the dynamic characteristics of the bridge with or without pile-soil action were compared.(3)Comparing the results of two models with or without pile-soil interaction and with pile-soil under frequent earthquakes,the model considers the direction and lateral direction of the carriageway respectively,and analyzes by the response spectrum method.(4)Based on the above discussion,in accordance with relevant regulations,compared with the actual bridge structure,multiple seismic waves with similar frequency,response time,and acceleration peaks are selected and applied to the bridge structure.Internal force in the forward and transverse directions are compared to facilitate reasonable design..(5)Carry out elastoplastic analysis on the piers,establish plastic hinges in the constructed finite element model,find out the position of the plastic hinges,and give reasonable measures for the piers to resist earthquakes when rare earthquakes occur.