Study of Deformation and Displacement Related Parameters of High-Speed Railway Simply-Supported Girder Bridge

The rational limit values of deformation and displacement related parameters, including creep and settlement, of the high-speed railway simply-supported girder bridge are studied. Based on the vehicle-bridge coupling analysis theory, the influential factors of riding safety and human comfort of the high-speed railway simply-supported girder bridges with 32 m spans and 40 m spans, respectively were analyzed, incorporating various types of residual creep deformation and/or settlement of piers and abutments. The results demonstrate that the residual creep deformation and settlement of piers and abutments can exert significant effect on the vehicle body acceleration, but minor effect on the wheel load reduction rate. The deformation and displacement limit values of the simply-supported girder bridge after completion are mainly controlled by the comfort indexes, such as vehicle body acceleration. When both the residual creep deformation and settlement of piers and abutments after completion are concerned, the dynamic responses of vehicles are significantly augmented, while the vehicle body acceleration on the simply-supported girder bridge with 40 m spans is smaller than that on the simply-supported girder bridge with 32 m spans. Different deformation and displacement limit values should be given for high-speed railway bridges that allow for different running speeds. When the residual creep deformation is set at 10 mm and the design speeds are set at 250, 300 and 350 km/h, the corresponding limit settlement values of the abutments and piers for the simply-supported girder bridge with 32 m spans are 6, 8 and 6 mm, while for the simply-supported girder bridges with 40 m spans, the values are 8, 10 and 12 mm. © 2021, Journal Press, China Railway Bridge Science Research Institute, Ltd. All right reserved.