螺栓接触非线性对钢牛腿-钢锚梁组合结构受力状态的影响研究

发布时间：2018-11-26 19:37

【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。
[Abstract]:In order to understand the influence of bolt contact nonlinearity on the mechanical behavior of steel corbel steel anchor beam composite structure and the stress state of high strength bolt itself, based on the macroscopic stress analysis, the Hongshuihe Bridge in Guizhou Province is taken as the background. The finite element model of the whole bridge and the cable tower Anchorage structure is established based on ANSYS, and the calculation, analysis and comparison are carried out. The results show that on the one hand, the nonlinear contact of bolts has a beneficial effect on the synergistic mechanical properties of steel corbel and steel anchor beam. On the other hand, with the participation of high strength bolts, the longitudinal restraint at both ends of the steel anchor beam is strengthened, the amount of arch in the middle of the steel anchor beam increases obviously, the relative slip between the steel anchor beam and the steel leg decreases obviously, and the local stress around the bolt hole increases significantly. In general, the influence of bolt contact nonlinearity on the mechanical properties of steel corbel steel anchor beam composite structure is unfavorable, and the analysis results without considering the action of high strength bolts are not safe.
【作者单位】：中南大学土木工程学院;
【基金】：贵州省交通运输厅科技项目(2013-122-001)
【分类号】：U441

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