Abstract:The Tongda Bridge in Taiyuan City is a single-pylon self-anchored suspension bridge with a main span of 208 m. The bridge pylon is a novel composite structural pylon form with a middle upper steel structure and a bottom steel-concrete composite structure, which not only fully utilizes the bearing capacity of the steel-concrete composite structure at the bottom of the pylon, but also greatly reduces the self weight of the bridge pylon, solving a series of problems caused by seismic resistance of the bridge. However, the design of this bridge pylon requires the use of spatial cables for the bridge, and the outer walls of the bridge pylon are mostly spatial curved surface plates. The structure of the steel pylon is rather complex. In order to make that the huge concentrated load transmitted from the main cable saddle of the bridge to the bridge pylon can be evenly transferred to the pylon column, and ensure the service safety of bridge, the beam structure of the bridge pylon, the structure of the steel pylon under the main cable saddle, the force state and the force transmission mechanism are studied. The obtained results can provide some references for the design of such steel bridge pylons in the future.
