The Analysis Of Stress Mechanism For Steel-concrete Composite Structure Of Hybrid Cable-stayed Bridges

Steel-concrete composite structure of hybrid cable-stayed bridges which havedifferent materials are composed by shear connectors, steel lattice rooms, load bearingplates and prestressing steels. Codes for the steel-concrete composite structure have notbeen issued so far, because the structure is very complex and the stress transformmechanism is unclear. Comprehensive consideration of the structure, force and boundaryof the steel-concrete composite structure，the finite element calculating model isestablished by solid element, shell element, spring element and link element to study thestress distributing and force transfer mechanism. Based on the combination modes of thesteel plates and concrete, two relevant finite element calculating models are established tostudy the two difference stress distributing and force transfer mechanism of steel-concretecomposite structure. Through the two comparative analysis between the different resultsof the two finite element calculating models, conclusions of stress distributing and forcetransfer mechanism of steel-concrete composite structure are proposed in the paper.The steel-concrete composite structure whose combination of the steel plates andconcrete constituted by shear connectors attaches great influence on types and devise ofshear connectors. The analysis of shear connectors adopts a finite element modelestablished in commercial finite element software ANSYS with a spring element namedcombine39to model the bond-slip behavior of shear connectors, with special attention toexplore the group of shear connectors. The result indicates that the numerical of the shearforces and slips of the shear connectors are in reasonable range. It can also reveal forcestress mechanism of the steel-concrete composite structure. Finally, this paper presentsadvice of the design and construction of the steel-concrete composite structure. The paperincluding the analysis of stress mechanism and shear connectors has significant referencevalue to those who study the stress mechanism of steel-concrete composite structure.