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中文摘要：
为了解螺栓接触非线性对钢牛腿-钢锚梁组合结构受力性能的影响及高强螺栓自身的受力状态,在宏观受力分析的基础上,以在建贵州红水河特大桥为背景,基于ANSYS建立该桥整体及索塔锚固结构的混合单元有限元模型,并进行了计算分析与比较。结果表明：螺栓接触非线性一方面对钢牛腿与钢锚梁的协同受力性能产生有利影响;另一方面,高强螺栓参与受力后,钢锚梁两端的纵向约束加强,钢锚梁中部上拱量明显增大,钢锚梁与钢牛腿之间的相对滑移明显减小,螺栓孔周边局部应力显著增大。综合来看,螺栓接触非线性对钢牛腿-钢锚梁组合结构受力性能的影响偏于不利,不考虑高强螺栓作用的分析结果偏不安全。
英文摘要：
In order to understand the effect of bolt contact nonlinearity on the mechanical state of steel corbelanchor beam composite structure,and the mechanical state of high strength bolts,on the background of the constructing Hongshui River Grand Bridge in Guizhou after macro mechanic analysis,the hybrid finite element models of the whole bridge structure and cable-pylon anchorage are established based on ANSYS,and the calculation and analysis are performed. The result shows that（ 1） on the one hand,the bolt contact nonlinearity has a favorable effect on the associative mechanical properties of steel corbel and anchor beam;（ 2） on the other hand,as high strength bolts involved in bearing loads,the longitudinal restraints at both ends of the anchor beam have been strengthened,the bending deformation of middle of anchor beam is increased obviously,the relative sliding between steel corbel and anchor beam is reduced,and the local stress around the bolt holes is increased significantly. In general,the effect of the bolt contact nonlinearity on the mechanical state of steel corbel-anchor beam composite structure lean to unfavorable,the analysis result without considering the action of high strength bolts is in unsafe side.
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