Research on Key Technologies of Seismic Isolation Design for Long-span and Long-distance Connection Bridges with Highway and Railway Constructed Jointly
Research on Key Technologies of Seismic Isolation Design for Long-span and Long-distance Connection Bridges with Highway and Railway Constructed Jointly
Starting from the structural characteristics of long span bridges built on road-cum-rail,the use of displacement type seismic isolation bearings with bidirectional isolation function is recommen-ded,especially the hyperbolic friction pendulum seismic isolation bearing with high bearing capacity.By analyzing the parameters of the hyperbolic friction pendulum isolation bearing,it is proposed to use different isolation states of upper and lower limits to determine the control area range for isolation de-sign.At the same time,for highway and railway joint bridges using hyperbolic spherical friction pen-dulum isolation bearings,it is necessary to consider the impact of additional deformation of the bear-ings and conduct vehicle bridge coupling vibration analysis.The additional deformation of the isolation bearings has a significant impact on the vertical acceleration index of vehicles,and should be given special attention.
关键词
公轨合建/大跨长联桥梁/减隔震支座/减隔震设计/车-桥耦合振动分析
Key words
road and rail joint construction/long span and long connected bridges/seismic isolation bearings/seismic isolation design/vehicle bridge coupling vibration analysis
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