The Earthquake Response Analysis Of High Bridge Pier

While China’s rapid economic development,the state is also to develop infrastructure.The number of bridges will drastically increase as needed to connect the complex terrain.In recent years,the earthquakes were frequent occurrence in our country.Around the earthquake hazard reports sometimes appear constantly.Bridge is lifeline in the transportation.And as with technology advances,bridge pier is higher and higher,the proportion of high bridge pier is growing.Therefore,the study of high-pier bridge own great significance.Firstly this paper describes the current situation of high pier bridge seismic research.It introduces the basic theory of the current bridge seismic response analysis and focuses on the widely used dynamic response spectrum method and time history analysis.Secondly,I used a bridge of Chongqing to build a model,the model respectively adopted thin-walled hollow pier,pier and solid double-column pier,and studied three different types.Contents were as follows:1.Midas Civil software built finite element model of the bridge structure and analyzed its modal.2.Using seismic response spectrum analysis and dynamic response time history analysis analyzed the type of different high pier,and the calculation results of the two analysis methods were compared.3.by varying the height of pier,I compared the result of model response analysis in the same types of piers and different pier height,and summarized the impact of high pier on seismic response.4.According to the results of the seismic response analysis put forward reasonable suggestions in the bridge pier structure seismic design.Through the analysis got the following conclusion:1.The modal analysis found that in the three types of piers the first few vibration mode were mainly cross the bridge to the deformation,the lateral deformation of the pier top was biggest in them,and vertical deformation of piers was mainly concentrated in the higher order modes.2.The key of the bridge seismic design was the design of the bridge pier.Along the bridge to bending of bridge piers was the weakest link in the earthquake response.3.Analysis changes of three types of piers dynamic response in the same pier.pier Bottom internal force of thin-walled hollow piers in seismic action of along the bridge was much smaller than the solid pier,it was advantageous to the resistance and structural stability.Lateral stiffness of the double column pier was the smallest,and lateral displacement and rotation of the pier top was the biggest.4.Increased cross-tie beam in double-column pier could increase lateral rigidity,and impact internal forces of pier.It could adjust seismic force in the distribution of the pier.5.In the seismic action of along the bridge and the same group of high pier model,three types of piers were that the lowest pier withstand seismic forces much bigger than the high pier.