Transfer Mechanism Of Steel-concrete Composite Segment Of Single-plane Cable-stayed Bridge Tower By Research

Steel-concrete composite segment of cable-stayed bridge tower will take the interactionof axial force, bending moment and shear force, mechanical characteristics is complicated. Itpasses the axial force and bending moment to the bottom of the concrete pillar, and transfermechanism is unclear. This paper is based on the previous research results and designexperience, taking the Daxie Second Bridge as engineering background, using researchmethods consist of finite element analysis, mainly from the following several aspects to carryout work：Firstly, setting up model of the entire bridge to obtain internal force boundary conditionsfor the top of steel-concrete composite segment by calculation, by using finite elementsoftware MIDAS. Secondly, setting up local model of steel-concrete composite segment toobtain stress distribution of steel structure，concrete structure and shear stud by calculation, byutilizing the large-scale general finite element software ANSYS. The results demonstrate thatcomposite segment is under linear unclear elastic working state, mechanical property of thecomponent is great.Transfer mechanism of axial forces in steel-concrete composite segment is detailedlyanalysed.Shear studs are the main transfer component in composite segment, the7row shearstuds closed to the top of concrete pass most of the vertical load, accounts about80%. Nearthe bearing plate, steel and concrete share the load ratio of about3:7.The design method of steel-concrete composite segment is analysed and summarized,which accumulates technical data and experienced of similar structures.