Study on Pylon Form and Anchorage Structure of Arch Supported Cable-Stayed Bridge for High-Speed Railway

Taking the newly-built bridge of Guangzhou-Shanwei High-Speed Railway spanning Shenzhen-Shantou West Expressway as the research object, Midas Civil software was used to establish the analysis model of the full-bridge. The forces of the parabolic and circular arch pylons with scattered anchorage on upper column and concentrated anchorage at top pylon were analyzed to study the pylon form and anchorage structure. The results show that the axial forces of different pylon forms are basically the same, while the bending moments differ greatly. The maximum bending moments under the conditions of concentrated anchorage and scattered anchorage are both located at top pylon and the former is positive while the latter is negative. Besides, the maximum bending moment values of parabolic and circular arch pylons with scattered anchorage are 9.7 and 1.8 times of those with concentrated anchorage respectively. A conclusion can be reached that the scattered anchorage on upper pylon is more applicable to parabolic arch pylon, which shows better stress state. The concentrated anchorage at top pylon and the scattered anchorage on upper pylon are both suitable for circular arch pylon. When concentrated anchorage at top pylon is applied to circular arch pylon, the deformation and stress state of pylon can be improved with installing transverse cable between pylons. And the pylon form can be selected according to the bridge construction conditions and stress requirements. The cluster anchorage structure at top pylon shows the advantages of clear force transmission, proper stress state and technical feasibility. © 2022, Editorial Department of China Railway Science. All right reserved.