The Seismic Analysis Response Of Asymmetric Continuous Rigid-frame Bridge

Asymmetric continuous rigid-frame bridges are mainly divided into several types:asymmetry of main beam parameters,asymmetrical bridge piers,and asymmetry of edge boundary conditions.They are similar to symmetrical continuous rigid-frame bridges in terms of their overall structure,but are in terms of force.The symmetrical continuous rigid-frame bridges are different,and the more significant the asymmetry,the greater the difference between them.In recent years,domestic and foreign experts and scholars have increasingly studied symmetric continuous rigid-frame bridges,but less research has been done on asymmetric continuous rigid-frame bridges.In order to obtain the effect of structural parameter asymmetry on the dynamic characteristics and seismic response of asymmetric continuous rigid-frame bridges,this paper uses the Midas Bridge(asymmetric continuous rigid frame bridge)of Yunnan Province as the background and the finite element software Midas/Civil as the main calculation.The tools were developed and the main research completed was as follows:1.First gives a brief description of the development of asymmetric continuous rigid frame bridge,and then the earthquake damage to the bridge structure and asymmetric earthquake response analysis of long span continuous rigid frame make a simple summary of the research status,get the importance of asymmetric continuous rigid frame bridge seismic response study.2.Are reviewed in this paper the static method,response spectrum method and time history analysis method and random vibration method,study the corresponding seismic method and understand the advantages and disadvantages of every method,the applicable scope,to be prepared for the follow-up studies.3.Response spectrum method and time-history analysis method were used to calculate the seismic response results of the Zhonglu Bridge under the E1 and E2 earthquakes respectively.By comparing the results of the two methods,the seismic response of the Zhonglu Bridge and the calculation of the two methods should be calculated.The maximum value of the results was analyzed for seismic design of asymmetric continuous rigid frame bridges.4.By comparing and analyzing the dynamic characteristics and seismic response results of the consolidation of the Zhonglu Bridge at the bottom of the pier and using the soil spring method to simulate the pile-soil-structure interaction,the previous scholars’research results were synthesized.It is concluded that considering the pile-soil-structure interaction,the stiffness of the structural system is reduced,and the displacement at the top of the pier increases,which has an adverse effect on the stability of the overall structure.When considering the seismic design of asymmetric continuous rigid frame bridges,it is very important to consider the influence of the pile-soil-structure interaction.It cannot be simply replaced by the consolidation of the bottom of the pier.5.By studying the structural parameters of the bridge(asymmetric coefficient,web width of the girder section,height of the bridge pier,longitudinal width of the bridge pier,distance between the two limbs of the pier),the influence of the dynamic characteristics and seismic response of the asymmetric continuous rigid-framed bridge,it is concluded that the structural parameters are not Symmetrical analysis of the dynamic characteristics and seismic response of asymmetric continuous rigid frame bridges can provide reference for future seismic design of asymmetric continuous rigid frame bridges.