铁路悬索桥钢丝绳吊索应力数值分析及疲劳评估

发布时间：2018-05-17 18:44

本文选题：悬索桥 + 吊索　；参考：《西南交通大学》2015年硕士论文

【摘要】：悬索桥是大跨度桥梁的桥型之一,而悬索桥吊索作为主要传力构件,容易经受周围环境、温度的影响而发生性能的改变,悬索桥吊索在使用阶段承受汽车以及风等动荷载作用,容易产生疲劳问题,然而国内对于悬索桥吊索钢丝绳内部钢丝应力和疲劳相关理论分析较少。论文主要针对上述问题对以下内容进行了探讨：1.钢丝绳内部钢丝应力分析根据Costello总结的相关钢丝绳内部钢丝受力基本原理,推导了简单构造钢丝绳内部钢丝应力计算公式并编制程序,并进一步将简单构造钢丝绳内部钢丝应力的计算理论扩展到多层多股钢丝绳内部钢丝应力计算中,使各种构造钢丝绳内部钢丝应力有较为精确的定量分析。2.建立钢丝绳空间几何模型以及有限元模型得到了钢丝绳在直立和弯曲状态时各根钢丝中心轴线数学方程,根据相应几何关系建立了钢丝绳几何空间模型以及有限元模型,并讨论了钢丝绳有限元模型分析时需要注意的问题,此外根据简单构造钢丝绳有限元模型对理论计算值进行了验证。3.根据理论计算公式验算吊索疲劳强度根据我国铁路桥梁疲劳检算的设计规范和标准得出相应的疲劳荷载布载方式,运用桥梁结构非线性分析系统BNLAS计算得出各吊索相应荷载值。结合吊索疲劳荷载值,利用理论推导公式对钢丝绳内部钢丝各处疲劳最不利点进行了疲劳验算,根据相关理论获得了钢丝抗疲劳强度并验算了钢丝绳吊索的疲劳强度。研究得出：各种构造的钢丝绳能够使用本文推导的公式进行钢丝绳内部钢丝的应力计算,能取得较好的应力分析结果。计算分析发现钢丝绳在经受弯矩作用时内部中心钢丝受力最大,外部螺旋钢丝可通过相应的变形比例换算系数计算相应内力。钢丝绳有限元模型建立时,钢丝之间容易产生由于变形而导致钢丝重叠问题,采用数学建模的方式能够较好地解决这个问题。吊索钢丝绳的疲劳问题在吊索骑跨索夹处非常突出,在直立吊索段及锚固处的疲劳问题较为缓和。
[Abstract]:Suspension bridge is one of the bridge types of long-span bridges, and suspension bridge sling as the main force transmission component, it is easy to withstand the surrounding environment, the influence of temperature and the change of performance. The suspension bridge hanger is subjected to the dynamic load of automobile and wind in the use stage, and it is easy to produce fatigue problems. However, the internal steel wire rope steel rope steel wire rope in China is used. The analysis of the theory of wire stress and fatigue is less. The following contents are discussed in this paper. 1. the stress analysis of steel wire inside the wire rope is based on the basic principle of the internal force of steel wire in the steel rope summed up by Costello, and the formula for calculating the stress of the steel wire inside the wire rope is deduced and the program is compiled. The calculation theory of steel wire stress in simple structure steel wire is extended to the calculation of internal steel wire stress in multi-layer and multi strand wire rope, which makes the internal steel wire stress in all kinds of steel wire rope more accurate quantitative analysis.2. to establish the space geometric model of wire rope and the finite element model to get the steel rope in the upright and bending state of the steel. The mathematical equation of the central axis of wire is established, and the geometric space model of wire rope and the finite element model are established according to the corresponding geometric relation, and the problems needing attention in the analysis of the finite element model of the wire rope are discussed. In addition, the theoretical calculation value is verified by the finite element model of the simple structure steel wire rope, and.3. is used to check the sling according to the theoretical calculation formula. According to the design standard and standard of railway bridge fatigue calculation in China, the fatigue strength obtained the corresponding fatigue load distribution mode. Using the bridge structure nonlinear analysis system BNLAS to calculate the corresponding load values of the sling. Combined with the fatigue load value of the sling, the theory derivation formula is used to carry out the most unfavorable fatigue points of steel wire internal steel wire. The fatigue strength of steel wire is obtained and the fatigue strength of wire rope sling is calculated according to the related theory. It is concluded that the steel wire rope in various structures can use the formula derived in this paper to calculate the stress of steel wire inside the wire rope, and the results of stress analysis can be obtained. The calculation analysis found that the wire rope is subjected to bending. When the finite element model of the steel wire rope is established, the wire rope can easily produce the problem of wire overlap caused by the deformation of steel wire, and the wire rope can be solved by mathematical modeling. The fatigue problem is very prominent at the cable straddle cable clamps, and the fatigue problem at the vertical sling section and anchorage is more relaxed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.25

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