Seismic Analysis of Hybrid System Bridge of Multi-span Continuous Girder and Arches
In order to understand the influence of adjacent structure,traveling wave effect and isolation system on the internal force of multi span continuous beam arch composite system bridge,the calculation model was established by using finite element software based on a continuous beam arch composite system bridge.The seismic response was analyzed by response spectrum method and dynamic time history analysis method.The results show that:1)The calculation results of the two methods are basically consistent under the earthquake action along the bridge direction,and the calculation results of former are slightly larger than that of later,and the calculation result of response spectrum method is relatively safe;2)The internal force of transition pier is greatly affected by adjacent structure,and the influence of adjacent structure is suggested to be considered;3)Considering traveling wave effect,the displacement and bending moment of the control section of each hole increase slightly,and the fixed-pier's internal force increases significantly.With the increase of wave velocity,the seismic response of the structure gradually tends to the seismic response under the uniform excitation;4)After the FPB(friction pendulum isolation bearing)is used,the internal force and displacement response of the structure are greatly reduced,and the force of each pier is more uniform.After adopting the friction pendulum isolation bearing,the internal force and displacement response of the structure are greatly reduced,and the force on each pier is more uniform.It is recommended that large-span bridges adopt a seismic isolation system to reduce the seismic response of the structure.
beam-arch combination system bridgeseismic analysisresponse spectrum methoddynamic time history analysis methodadjacent structuretraveling wave effectfriction pendulum isolation bearing
万方数据
维普
