Elastic-Plastic Analysis Of Seismic Response Of High-Pier And Long-Span Continuous Rigid Frame Bridge

In recent years,continuous rigid frame bridge has been developed vigorously in our country.Especially,in the mountainous area of southwest China,the prestressed concrete continuous rigid frame bridge of high pier has been widely used because of its many advantages.At the same time,the southwestern region is also an earthquake-prone area and the magnitude is large.Therefore,it is very necessary to study the nonlinear elastic-plastic seismic response analysis of the continuous rigid frame bridge under rare earthquakes.In this paper,the development of continuous rigid frame bridge and the status quo of seismic research are briefly introduced.At the same time,the concept of ductile seismic is briefly introduced,and the theoretical knowledge and calculation method of dynamic analysis of bridge structure under earthquake response are briefly Secondly,the finite element model of MIDAS CIVIL is established by using the large-scale general finite element software MIDAS CIVIL,and the elastic time history analysis and elasto-plastic dynamic time history analysis are carried out.Completed the following work:1,This paper introduces the research status of the development of continuous rigid frame bridge at home and abroad and the analysis of elasto-plastic seismic analysis.The basic objectives of bridge seismic fortification are expounded,and the theory of ductile seismic is briefly introduced.2,The basic principle of the dynamic analysis of the bridge structure under earthquake response and some calculation methods commonly used in seismic design are introduced.3,The modeling process of MIDAS CIVIL using large-scale finite element software is introduced,and its self-vibration characteristic is calculated after considering the effect of pile and soil.4,The finite element model of the continuous rigid frame bridge is analyzed by the linear elastic dynamic time history analysis method and the nonlinear elastohydrodynamic time history analysis method in the longitudinal direction of the bridge and the transverse bridge.At the same time,And determine the position and angle of the plastic hinge to determine the working state of the continuous rigid frame bridge pier under rare earthquakes.5,respectively,the number of bridge pier and the height difference between the two piers as the object of study,the model in the bridge and transverse bridge up the elastic-plastic dynamic time history analysis and comparison,the study of its pier in the rare The results show that the number of piers and the height of the pier are the most favorable for the seismic design of rare earthquakes due to the change of internal force,displacement and plastic ductility.