空间缆索体系悬索桥施工过程精细化分析

发布时间：2018-03-31 06:42

本文选题：空间缆索　切入点：空间线形　出处：《西南交通大学》2017年硕士论文

【摘要】：空间缆索体系悬索桥是一种由主缆、吊索以及加劲梁组成的三维索体系桥梁,其造型优美、受力合理,与同等规模的平面缆索体系悬索桥相比,空间缆索体系悬索桥在吊索内力增加不多的情况下,横向刚度显著提高,桥梁抗风性能明显改善,是未来大跨度桥梁的一个发展方向。对其精细化分析是空间缆索体系悬索桥设计与施工的保障,本文为提高空间缆索体系悬索桥的精细化施工分析做了以下工作。利用悬链线索单元面内切线刚度,通过求极限方法推导了索单元的面外刚度,建立了空间索单元刚度矩,并对该空间索单元刚度矩阵进行了适用范围研究,对垂直吊索、无自重索等特殊索单元的刚度矩阵进行了推导;探讨了空间缆索系统悬索桥索鞍在空缆状态与成桥状态的平衡条件和索鞍参数设计的基本原则,利用18元方程组与牛顿迭代法求解了适用任意空间索鞍与主缆的竖向、横向切点几何信息;探讨了空间散索鞍上索股在鞍槽内的横截面稳定条件与三维空间稳定条件,在稳定的基础上确定了空间散索鞍整体参数设计与鞍槽曲线的设计原则,在考虑索股张力在鞍槽内存在摩擦损失的情况下推导了空间散索鞍的合力线的计算理论公式。以VS2015为开发平台,利用C++编程语言结合上述理论推导编制了空间缆索体系悬索桥找形计算程序与空间散索鞍合理合力线计算程序,并与BNLAS计算结果对比,本文程序具有使用方便、计算精度高等特点。最后以Halogaland空间缆索悬索桥为研究对象,研究了猫道承重索的经济合理架设方案、确定了猫道抗风索初始张力,研究了无应力长度不变原理在该桥索股架设的应用与实际索股架设控制技术;研究了 5杆、7杆、9杆主缆横向顶撑方案,实现了主缆平面线形到空间线形的平缓过渡,并分析了不同方案对主缆线形和撑杆内力的影响;探讨了从空缆平面线形到成桥空间线形主缆横向转动位移问题,并得出了主缆横向总转动位移由主缆整体几何转动位移与主缆截面扭转变形两部分组成的结论。通过Haloga1and主缆截面弯扭刚度对主缆截面扭转变形影响的敏感性分析,认为Ha1oga1and桥主缆截面扭转变形受主缆弯扭刚度影响较小,主缆索夹横向预偏角主要来自主缆几何扭转位移部分;最后对HAlogaland吊梁过程进行了分析,各项指标均经济合理。
[Abstract]:Space cable system suspension bridge is a three-dimensional cable system bridge composed of main cable, sling and stiffened beam. Its shape is beautiful and the force is reasonable, compared with the plane cable system suspension bridge of the same size. The lateral stiffness and wind-resistant performance of the space cable system suspension bridge are obviously improved when the internal force of the sling is not much increased. It is a development direction of long span bridge in the future. The detailed analysis is the guarantee of the design and construction of the suspension bridge with space cable system. In order to improve the fine construction analysis of space cable system suspension bridge, the following work is done in this paper. By using the tangent stiffness of catenary clue element, the out-of-plane stiffness of cable element is deduced by the limit method, and the stiffness moment of space cable element is established. The stiffness matrix of the space cable element is studied and the stiffness matrix of the special cable element such as vertical sling and no deadweight cable is deduced. In this paper, the equilibrium conditions of the saddle state and the cable saddle parameter design of the suspension bridge in space cable system are discussed. The vertical direction of the saddle and the main cable is solved by using the 18-element equations and Newton's iterative method. The geometric information of transverse tangent point, the stability condition of cross section and three dimensional space stability of the cable strands in the saddle groove are discussed, and the design principle of the integral parameter of the saddle and the curve of the saddle slot are determined on the basis of the stability. Considering the friction loss of cable strands tension in saddle grooves, a theoretical formula for calculating the resultant line of spacial loose saddle is derived. Using VS2015 as the development platform, the theoretical formula for calculating the resultant line of the saddle is derived. The program of shape finding for suspension bridge of space cable system and the calculation program of reasonable force line of space cable saddle are compiled by using C programming language combined with the above theoretical derivation. Compared with the calculation results of BNLAS, the program in this paper is convenient to use. Finally, taking the Halogaland space cable suspension bridge as the research object, the economic and reasonable erection scheme of the catwalk load bearing cable is studied, and the initial tension of the catwalk wind resistant cable is determined. The application of the principle of non-stress length invariance in the cable strands erection of the bridge and the control technology of the actual cable strands erection are studied, and the lateral jacking scheme of the main cable is studied, which realizes the smooth transition from the plane alignment of the main cable to the spatial alignment. The influence of different schemes on the main cable shape and the internal force of the brace is analyzed, and the lateral rotation displacement of the main cable from the plane line of the empty cable to the space line of the bridge is discussed. It is concluded that the total lateral rotational displacement of the main cable is composed of the overall geometric rotational displacement of the main cable and the torsional deformation of the main cable section. The sensitivity analysis of the influence of the bending and torsional stiffness of the Haloga1and main cable section on the torsional deformation of the main cable section is made. It is considered that the torsional deformation of the main cable section of the Ha1oga1and bridge is less affected by the bending and torsional stiffness of the main cable, and the transverse predeflection angle of the main cable clip mainly comes from the geometric torsional displacement part of the main cable, and finally, the process of the HAlogaland suspension beam is analyzed, and all the indexes are economical and reasonable.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4;U448.25

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