钢—超薄UHPC组合桥面板界面抗剪性能研究
[Abstract]:Orthotropic steel bridge panel has been widely used since its appearance in 1950s, because of its advantages such as light weight, convenient erection, saving materials, etc. A large number of large span bridges with orthotropic steel bridge panels have been built all over the world. However, the fatigue failure of steel beams and the rutting of pavement are easy to occur in the use of orthotropic steel bridge panels paved with asphalt mixture. A disease, such as cracking. In order to cure the two serious problems of orthotropic steel bridge panel, the project team introduced ultra-high performance concrete (UHPC) and combined with orthotropic steel plate to form light composite deck slab. It has been shown that this kind of composite structure can effectively reduce the fatigue detail stress amplitude of steel beam and almost eliminate the possibility of pavement cracking. The object of this paper is orthotropic steel plate and ultra-thin UHPC composite deck slab whose thickness of UHPC layer is only 35mm. Aiming at the shear properties of the interface, the following works have been accomplished: (1) in order to solve the problem that it is difficult for the steel-ultra-thin UHPC composite deck slab to use the conventional shear joint due to the thin UHPC layer, a new type of shear joint form is proposed. That is, steel mesh local welding shear joint (hereinafter referred to as welded shear parts). The shear bearing capacity and stiffness of 50mm long welded shear parts were measured and the load-slip relationship curves of welded shear specimens were obtained. At the same time, the finite element simulation was carried out in the whole process of launching test, and the parameters of the welded shearing parts were analyzed after comparing with the test results. The test results show that the failure process is brittle, the deformation of the specimens before failure is small, and the ultimate shear strength of welded shear parts with weld length of 50mm is 119kN. The linear elastic shear stiffness of welded shears is 1838kN / mmm. The results show that the transverse and longitudinal shear stiffness of welded shearing parts are not different, and the transverse shear strength is higher than the longitudinal shear bearing capacity. With the decrease of welding length, the difference between transverse and longitudinal shear bearing capacity decreases. The shear bearing capacity, shear stiffness and the length of welded shear and the diameter of longitudinal steel bar are positively correlated with the length of welded shear piece and the diameter of longitudinal steel bar. The shear stiffness and shear bearing capacity of the bridge decrease. (2) taking Runyang Yangtze River Bridge as the engineering background, the local segment finite element model is established. The influence of different arrangement schemes of welded shear resistance on the mechanical properties of UHPC layer and steel beam was studied by submodel technique. The results show that the arrangement of shear-resistant joints has great influence on the UHPC layer of light-duty composite deck slab, but has little effect on the components of steel beam. When the weld area of welded shear-resistant parts per unit area is fixed, using a smaller size of welded shear-resistant parts, that is, increasing the arrangement density of shear-resistant pieces, can reduce the transverse and longitudinal bridge stresses at the bottom of UHPC, and the decrease can be up to 36%, thus increasing its durability. It should be taken into account in the design. At the same time, increasing the arrangement density can also reduce the peak stress of the steel beam detail, and enhance the interface connection degree to improve the mechanical performance of the composite bridge deck system.
【学位授予单位】:湖南大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:U441
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