Span Curve Rigid Frame Bridge Static Properties And Seismic Response Parameter Sensitivity Study

Long-span continuous rigid frame bridge gets widely builded with the rapid development of the traffic construction in our country.However, lots of studies focus on linear rigid frame bridge rather than the research of static and dynamic properties of the long-span curve rigid frame bridge, especially the research of elastoplastic seismic response is relatively rare.Based on 3rd Tuanjie Bridge in Jicha Highway in this paper,using the Madis,a large finite element program,the research about the static properties and parameter sensitivity on the seismic responses of the high pier long-span curve rigid frame bridge is carried on and the main contents and results are as follows:(1) The finite element model of 3rd Tuanjie Bridge is established using the Midas, static performance impact of long-span curve rigid frame bridge is analysed in different radius and pier height.The result make clear that torque of the girder and out-of-plane bending moment of the girder and pier gradually decrease with the increased curvature radius;out-plane bending moment of the girder and pier gradually decrease with the increased pier height,but the influence for in-plane bending moment and torque of the girder is very small.(2) The affect of the elastic stability in construction and operation condition are researched with different curvature radius in the curve rigid frame bridge.The results make know that stability is relatively not affected in wind loads;stability factor in cantilever construction and operation condition gradually increase with the add of the curvature radius。(3) Based on the torque analysis of 3rd Tuanjie Bridge, prestressed reinforcement optimization on curve rigid frame bridge to reduce the girder torque get researched.The results show that asymmetric tension and asymmetric layout of prestressed reinforcement are the effective measures which can validly cancel out the torque of the dead load.(4) Seismic response analysis of curve rigid frame bridge in different radius and pier height is carried on using dynamic time-history analysis and linear analysis results is compared with the elastoplastic analysis results.The conclusion indicate that there is a large difference between linear analysis and elastoplastic analysis results,which should be given special attention in seismic analysis.