【作者】 马超；

【导师】 李之达；

【作者基本信息】 武汉理工大学 ， 结构工程， 2008， 硕士

【摘要】 斜拉桥的主要组成部分是主梁、斜拉索和索塔,是一种桥面体系主要受压,索体系受拉的桥式。其桥面体系由加劲梁构成,其支承体系由钢索组成。斜拉桥主梁、主塔受力对索力大小很敏感,而斜拉索索力可以调节,故斜拉桥的设计存在一个通过优化成桥索力来优化斜拉桥成桥内力的合理成桥受力状态确定问题。成桥受力状态确定可以不考虑施工过程,以成桥状态的受力体系为分析对象,通过对成桥索力的调整来获得一个合理的成桥状态。而本文正是需要解决这两个方面的问题:其一为什么样的成桥状态是合理的;其二为如何调整成桥索力来获得已定好的合理成桥状态。在斜拉桥的结构计算中,确定成桥目标状态和施工目标状态是两项至关重要的工作,通常是先确定成桥目标状态,然后以成桥目标状态为基础根据施工工序确定各施工目标状态。本文通过对重庆忠县长江大桥斜拉桥施工模拟计算,对斜拉桥在设计优化阶段对斜拉桥索力进行了优化,使其对桥塔,主梁,索等桥的各个方面(包括弯矩,挠度,应力,位移等等)的受力情况更合理,并对施工过程中出现的个方面问题进行的分析解决。主要开展了一下几个方面的工作:(1)对各种合理成桥的方法的对比,通过一种方法使斜拉桥更好的受力,使其得到最大的优化。通过对主梁的应力,位移,弯矩等各方面进行对比,来得到结果。(2)确定合理施工状态的计算方法有:倒拆法,正装迭代法,无应力状态法。通过这三种方法的对比,可以知道彼此的优点和存在的不足。并对正装迭代法计算中的问题进行了分析和考虑,如混凝土收缩、徐变问题和结构几何非线性问题。(3)对斜拉桥施工过程的节段索力和全桥索力进行了特别的研究。并对施工实测值和设计值进行对比,对施工中出现的问题进行解决。以保证施工过程中结构的安全。(4)如何减少索力在设计过程中和施工过程中的误差,是今后考虑的一个主要问题,至于索力优化问题,相信随着科学技术的发展,会得到一种更好的方法,会使结构受力更合理。通过以上问题的分析考虑,能为今后斜拉桥的建设提供一定的指导意义。更多还原

【Abstract】 Cable-stayed bridge is the main component of the main beam, and the tower cable-stayed, which is a major pressure on the bridge deck system, cable system by widening the bridge. Its deck system is posed by stiffening beam, supported by the system of cables. The main tower of the cable force size is very sensitive, and the tension of the cable-stayed can be adjusted .So there is a cable-stayed bridge design through optimization of the cable bridge to optimize Cable-stayed bridge internal forces of the legitimate status of the bridge by identifying the problem.The state of bridge stress can not determine the status of the construction process in order to bridge the state’s system for stress analysis of the object through the bridge of the cable force adjustments to get into a reasonable state of the bridge. In this paper, which is the need to solve two issues: first, why the bridge into a kind of state is reasonable; second, how to adjust the bridge for the cable force has been set to get into a reasonably good state of the bridge.Cable-stayed bridge in the structure of the calculation to determine the status and objectives of bridge construction is the goal of two states crucial to the work, usually to determine the bridge into the goal, and then to bridge the target based on a state based on the construction process to determine the construction the last state.Based on Zhongxian County in Chongqing Yangtze River Bridge Construction simulation of cable-stayed bridge, the cable-stayed bridge in the design stage to optimize the cable-stayed bridge cable force has been optimized to enable it to the bridge towers, the main beam, such as cable bridge in all its aspects (including moment, around, stress, displacement, etc.) of the force in a more reasonable and in the process of construction of the aspects of the issue resolved.Main problems solutioned include:(1) The reasonable bridge on the way, through a cable-stayed bridge to a better method of force to get the maximum optimization. Through the main beam of stress, displacement, the moment in areas such as compared to results. (2) Determining a reasonable state of the construction method of calculation are: inverted demolition, is loaded method, no stress state law. Through these three methods of comparison, you can let us know each other’s merits and shortcomings.And the calculation method is with the problems that exist in an analysis and consideration, such as the shrinkage of concrete, creep and geometric structure of nonlinear problems.(3) Construction of the cable-stayed bridge section of the cable force and full-bridge cable force a special study. Construction and design value and actual value comparison, the construction of the problems to resolve. To ensure that the construction process of structural safety.(4) How to reduce power demand during the design process and construction in the process of error is taken into account in the future a major problem, as power demand optimization, I believe that with the development of science and technology, will be a better way, So that the force structure is more reasonable.Through the above analysis of the issues to consider, the cable-stayed bridge provide some guidance for the future.更多还原