| The main girder, pylons and cables is the main load-bearing components ofcable-stayed bridge, select different structural forms and material may make upswinging, novel and chic form of cable-stayed bridge. Cable-stayed bridge girdermainly applies steel girder or concrete girder, pylons mainly applies steel tower orconcrete tower. With rapid development of long span cable-stayed bridge, set newdemand for rationality of structure, steel and concrete composite structure withfavourable mechanical performance and Economy, is more extensive applied incable-stayed bridge.Steel-concrete composite segment of cable-stayed bridge tower will take stress ofthe whole upper steel tower safely and equably to concrete tower under anchorage zone,also in the anchorage zone of cable-stayed bridge, stress concentration and withcomplex architecture, is difficulties and the key to design and construction. Besides, thecomposite segment take the interaction of axial force, bending moment and shear force,mechanical characteristics is unclear. So, on the basis of reasonable boundary internalforce for the top of steel-concrete composite segment through set up the whole bridgestructure simulation analysis model, Utilizing the large-scale general finite elementsoftware ANSYS to local fine finite element analysis of steel-concrete compositesegment, get the deformation and stress distribution of the component to bear loads, andexplore load path and transfer mechanism of steel-concrete composite segment. Thispaper depends on the No.1bridge in the south of Mianyang engineering, mainly fromthe following several aspects to carry out work:①Using finite element software MIDAS/CIVIL to set up model of the entirebridge, obtained internal force boundary conditions for the top of steel-concretecomposite segment by calculation.②U tilizing the large-scale general finite element software ANSYS to set up localmodel of steel-concrete composite segment, under bearing capacity limit states andserviceability limit states, obtained displacement and stress distribution of concretestructure, steel box structure and PBL perforative steel bar by calculation. The resultsdemonstrate that composite segment is under linear elastic working state, overall stresslevel is low.③To analyze transfer mechanism of steel-concrete composite segment, the results demonstrate that under bearing capacity limit states and serviceability limit states, loadproportion of bearing plate and PBL shear connectors is simplified by1:2.④Calculate stress states of steel-concrete composite segment under1.7timesbearing capacity limit states, the results demonstrate that nonlinear characteristics is notsignificant and in the elastic state; structural safety and reliability is relatively high.By analyzing this, some valuable rules were got and can be used for reference indesign, construction and monitoring for homothetic steel-concrete composite segment. |
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