Research on the Structural Design of Space Rigid Frame Railway Bridges
The space rigid frame structure,as a new type of railway bridge structure,lacks targeted research on the their mechanical performance.Through the calculation and analysis of its deformation index,mechanical characteristics and engineering cost,the structural form and main component size of the spatial rigid frame railway bridge are compared and studied,and the main structural construction is determined:The total longitudinal length of the space rigid frame unit is about 100 m,and the typical longitudinal and transverse spans are 20.0 m and 13.0 m respectively;The bridge deck adopts the longitudinal and transverse beam structural system.The results of dynamic simulation analysis show that all calculation indexes of the bridge meet the requirements,but the application of the bridge in high-speed railway worth further study.It is recommended to use the pile bottom grouting method and the"jumping position method"to reduce the influence of unfavorable factors such as foundation differential settlement and shrinkage creep on the structure.
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