拱形斜塔斜拉桥仿真分析与关键技术研究

发布时间：2018-04-30 02:17

本文选题：斜塔 + 斜拉桥　；参考：《东南大学》2015年硕士论文

【摘要】：拱形斜塔斜拉桥是一种新颖的斜拉桥结构的分支。这种桥型由于斜向、拱形的特点,空间效应非常明显,不论是设计,还是施工,难度都非常大。因此,这种新颖的桥型就给实际的施工控制过程带来了创新型的课题。本文结合实际工程兆河大桥,研究了斜拉桥施工控制的相关理论,以及施工控制技术在兆河大桥施工过程中的应用,对兆河大桥主塔和主梁的线形和内力进行了施工控制。本文重点论述了兆河大桥施工控制的内容、实施方法,对主梁、主塔线形控制和内力控制中的实际监测的结果和理论计算结果进行了比较分析。通过施工控制技术的指导,保证了兆河大桥在线形控制、内力控制等方面达到了设计的要求,确保了兆河大桥的安全施工。以兆河大桥为基础,建立了兆河大桥成桥阶段和施工阶段仿真计算模型,包括MIDAS杆系模型、MIDAS梁格法模型和ANSYS模型。在兆河大桥的现场施工控制中,以仿真计算的数据作为理论控制值,提供主梁施工预拱度、控制截面位置处的应力、主塔预偏量等关键数据,理论计算的结果指导了兆河大桥的施工。同时,为保证仿真计算用的有限元模型的准确性,采用梁格法和实体模型法两种模型进行对比分析,比较各种计算模型计算结果的误差大小,理论计算结果误差合理时再用于指导兆河大桥的施工,以尽可能保证计算结果的正确性。提出了确定兆河大桥合理成桥状态的各种方法,并用影响矩阵法确定了兆河大桥的合理成桥索力,其基本思路是：鉴于影响矩阵法的影响元素可以取内力、位移等中的一个,利用MIDAS软件中的未知荷载系数功能给兆河大桥斜拉索赋予初始张拉力,然后将恒载和斜拉索单位初始拉力建立荷载组合,计算出满足约束条件的目标函数,得到一组未知荷载系数。以求得的该组荷载系数建立新的荷载组合,计算查看分析结果是否满足定义的约束条件。提出了确定兆河大桥合理施工状态的正装迭代法,其基本思路是：先假定一组控制张拉索力,按正装计算得到一个成桥状态,将该成桥状态与事先定好的合理成桥状态比较,按最小二乘法原理使两个成桥状态相差最小,以此来修正控制张拉索力,再进行新的一轮正装计算,直至收敛为止。该方法只需做正装计算,且将不闭合原因造成的影响通过最小二乘法原理降到最低程度。采用有限元仿真分析软件来确定兆河大桥斜拉索施工索力。施工索力用于斜拉索张拉时的施工控制中,成桥后测得的索力再与设计成桥索力对比,验证施工索力计算的正确性。
[Abstract]:Arch inclined tower cable-stayed bridge is a new branch of cable-stayed bridge structure. Due to the characteristics of skew and arch, the spatial effect of this bridge is very obvious, whether in design or construction, it is very difficult. Therefore, this novel bridge type has brought the innovative subject to the actual construction control process. This paper studies the construction control theory of cable-stayed bridge and the application of construction control technology in the construction process of Zhaohe Bridge, and controls the alignment and internal force of the main tower and girder of Zhaohe Bridge. In this paper, the contents and methods of construction control of Zhaohe Bridge are discussed, and the actual monitoring results and theoretical calculation results of main girder, main tower alignment control and internal force control are compared and analyzed. Through the guidance of construction control technology, the design requirements of the Zhaohe Bridge in the aspects of linear control and internal force control are ensured, and the safe construction of the Zhaohe Bridge is ensured. Based on the Zhaohe Bridge, the simulation calculation models of the Zhaohe Bridge in the stage of bridge completion and construction are established, including the MIDAS bar model and the Midas beam method model and the ANSYS model. In the field construction control of Zhaohe Bridge, the simulation data is used as the theoretical control value to provide the key data such as the pre-arch degree of the main beam construction, the stress at the control section position, the pre-deflection of the main tower, and so on. The results of theoretical calculation have guided the construction of Zhaohe Bridge. At the same time, in order to ensure the accuracy of the finite element model used in simulation calculation, the beam method and the solid model method are used to compare the error between the calculation results of the two models. When the error of theoretical calculation results is reasonable, it can be used to guide the construction of Zhaohe Bridge so as to ensure the correctness of the calculation results as much as possible. Various methods to determine the reasonable state of Zhaohe Bridge are put forward, and the rational cable force of Zhaohe Bridge is determined by using the influence matrix method. The basic idea is as follows: in view of the influence elements of the influence matrix method can take one of the internal forces and displacements, etc. The function of unknown load coefficient in MIDAS software is used to give initial tension to the cable of Zhaohe Bridge. Then the load combination of dead load and unit initial tension of stay cable is established, and the objective function satisfying the constraint condition is calculated. A set of unknown load coefficients are obtained. Based on the set of load coefficients obtained, a new load combination is established, and the analysis results are calculated to see if the defined constraint conditions are satisfied. This paper presents an iterative method for determining the reasonable construction state of Zhaohe Bridge. The basic ideas are as follows: first, a group of tension forces are assumed to be controlled, and a bridge state is obtained according to the calculation of the normal load, and the state of the completed bridge is compared with the reasonable state of the bridge determined in advance. According to the principle of the least square method, the difference between the two completed bridge states is minimized, so that the tension can be modified and controlled, and then a new round of dress calculation is carried out until the convergence is reached. This method only needs to do formal calculation, and the influence caused by non-closure is minimized by the principle of least square method. The finite element simulation analysis software is used to determine the cable force of cable construction of Zhaohe Bridge. The construction cable force is used in the construction control of the cable-stayed tension. The cable force measured after the completion of the bridge is compared with the designed cable force to verify the correctness of the calculation of the construction cable force.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27

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