斜拉桥合理成桥状态确定及施工控制仿真分析
发布时间：2018-08-14 15:30
【摘要】：合理成桥状态及合理施工状态是斜拉桥理论研究的重要课题，本文以河口大桥作为工程背景，研究了影响矩阵法在成桥索力优化中的应用，对采用无应力状态法进行施工控制做了分析研究。 ①以虚位移原理和最小势能原理为基础研究了无应力状态法的控制理论，通过算例分析得出了分阶段施工桥梁的平衡方程。根据无应力状态法的基本原理，推导出斜拉桥无应力长度差与索力变化一一对应的关系，从理论角度验证了无应力状态法的严密性和可靠性。 ②研究了影响矩阵法在斜拉桥中的索力优化原理，并且以河口大桥为工程背景，结合Midas/civil中以影响矩阵法为工作原理的未知荷载系数功能，计算成桥索力并进行索力优化，得到合理成桥状态。分析得到了主梁位移约束条件下影响矩阵的规律及意义，并研究了影响值的计算方法。从索力优化以后提取的主梁竖向位移、主塔顺桥向位移、斜拉索索力等结果可以看出，用影响矩阵法进行索力优化是可行的，特别当结合Midas/civil中的未知荷载系数功能时，，实现起来较为方便。 ③运用了基于悬链线原理的斜拉索无应力长度的计算方法，用Excel迭代计算出无应力索长。建立河口大桥的施工阶段模型，以斜拉索的无应力长度作为控制量进行施工控制，确保在到位张拉时将斜拉索的无应力长度张拉至成桥目标状态下的无应力长度。对比正装计算的成桥索力和成桥目标状态的斜拉索索力，可知由于混凝土收缩徐变因素使得二者存在差异，但通过迭代计算可以消除这种差异，验证了无应力状态法的正确性和可靠性。
[Abstract]:Reasonable completion state and reasonable construction state are important topics in the theoretical research of cable-stayed bridges. Taking Hekou Bridge as the engineering background, this paper studies the application of influence matrix method in the optimization of cable forces of completed bridges, and makes an analysis and Study on the construction control of non-stress state method.
(1) Based on the principle of virtual displacement and the principle of minimum potential energy, the control theory of the stress-free state method is studied, and the equilibrium equation of the bridge with staged construction is obtained through the analysis of an example. The tightness and reliability of stress state method.
(2) The optimum principle of cable forces in cable-stayed bridges by influence matrix method is studied. Taking Hekou Bridge as the engineering background and combining with the unknown load coefficient function of Midas/civil which takes influence matrix method as the working principle, the completed cable forces are calculated and the cable forces are optimized, and the reasonable completed state is obtained. From the results of vertical displacement of main girder, along-bridge displacement of main tower and cable force of cable stayed, it can be seen that the influence matrix method is feasible to optimize the cable force, especially when combined with the function of unknown load coefficient in Midas/civil. Then.
(3) Using the method of calculating the unstressed length of cable based on catenary principle, the unstressed length of cable is calculated by Excel iteration. The construction stage model of Hekou Bridge is established, and the unstressed length of cable is taken as the control quantity to control the construction, so as to ensure that the unstressed length of cable is stretched to the target shape of the bridge when the cable is in place. Comparing the cable tension of the finished bridge with the cable tension of the target state, it can be seen that there is a difference between them because of the shrinkage and creep of concrete, but the difference can be eliminated by iteration calculation, which verifies the correctness and reliability of the stress-free state method.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
本文编号：2183309
[Abstract]:Reasonable completion state and reasonable construction state are important topics in the theoretical research of cable-stayed bridges. Taking Hekou Bridge as the engineering background, this paper studies the application of influence matrix method in the optimization of cable forces of completed bridges, and makes an analysis and Study on the construction control of non-stress state method.
(1) Based on the principle of virtual displacement and the principle of minimum potential energy, the control theory of the stress-free state method is studied, and the equilibrium equation of the bridge with staged construction is obtained through the analysis of an example. The tightness and reliability of stress state method.
(2) The optimum principle of cable forces in cable-stayed bridges by influence matrix method is studied. Taking Hekou Bridge as the engineering background and combining with the unknown load coefficient function of Midas/civil which takes influence matrix method as the working principle, the completed cable forces are calculated and the cable forces are optimized, and the reasonable completed state is obtained. From the results of vertical displacement of main girder, along-bridge displacement of main tower and cable force of cable stayed, it can be seen that the influence matrix method is feasible to optimize the cable force, especially when combined with the function of unknown load coefficient in Midas/civil. Then.
(3) Using the method of calculating the unstressed length of cable based on catenary principle, the unstressed length of cable is calculated by Excel iteration. The construction stage model of Hekou Bridge is established, and the unstressed length of cable is taken as the control quantity to control the construction, so as to ensure that the unstressed length of cable is stretched to the target shape of the bridge when the cable is in place. Comparing the cable tension of the finished bridge with the cable tension of the target state, it can be seen that there is a difference between them because of the shrinkage and creep of concrete, but the difference can be eliminated by iteration calculation, which verifies the correctness and reliability of the stress-free state method.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
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