赵王河桥吊杆张拉施工监控方法研究

发布时间：2018-04-19 05:05

本文选题：吊杆拱桥 + 索力监控　；参考：《吉林大学》2014年硕士论文

【摘要】：钢管混凝土系杆拱桥是一种新型的梁拱组合体系桥梁。该体系主要由拱肋，系梁，吊杆等结构构成。吊杆作为系梁和拱肋的之间的联系构件，其受力状态是否合理可靠直接影响着整个桥梁的受力性能，从而将决定着桥梁工作时是否安全可靠。而在系杆拱桥中，尤其对于大跨径桥梁的吊杆张拉都不是一步到位的，吊杆索力需要多次的张拉调整，才能达到施工设计所要求的受力状态以及成桥的整体线形的要求。系杆拱桥这种内部超静定，外部静定的结构体系再加上混凝土收缩，徐变的影响使得拱桥的受力状态更加复杂。由于结构体系的复杂性，在桥梁的施工期间再精确的理论计算也不能完全代替现场监测工作。因此，在吊杆张拉期间，对吊杆索力进行监测，依据监测结果制定详尽合理的张拉方案是十分必要的。另一方面，在桥梁的使用过程中，由于吊杆本身存在松弛和应力损失，再加上交通荷载的交变作用，吊杆的索力随着桥梁使用会发生变化。工程实践表明，吊杆索力的退化是一个随机的、非线性过程。因此可以认为在桥梁的运营期间，对吊杆索力的监测同样也是十分重要的。由于吊杆拱桥的吊杆有效长度较短，在桥梁运营期间的监测需要一些必要的数据。基础数据的获得最为有效的手段便是通过在吊杆张拉期间对吊杆进行监测，这一点同样说明了吊杆张拉期间进行施工监测的必要性。本文以赵王河桥吊杆张拉施工监控作为工程依托，主要开展了以下研究工作： 1、首先对吊杆拱桥的力学特征进行了简要的分析，从施工阶段各个构件的安全性出发，对吊杆张拉任务进行了分解，对吊杆张拉各过程中的关键技术进行了探讨。 2、依据设计参数，采用MIDAS\Civil建立了赵王河桥的有限元理论分析模型。基于影响矩阵和迭代算法结合有限元理论分析模型模拟了吊杆施工过程、分析了吊杆力的求解过程，制定了相应的张拉方案，通过理论计算使吊杆拱桥的最终成桥索力达到设计要求。 3、结合已有的振动理论基础，对频率法测试索力的原理进行了介绍，并讨论了应用频率法求解索力的三种理论计算模型。考虑在实际工程中，，由于索的长度、安装的阻尼器、抗弯刚度都会给模型带来一定影响，对模型进行修正或者结合一些新的算法，来得到更精确的结果，形成了一种精度较高的基于振动试验测定频率计算索力的方法。 4、结合实际工程，根据制定的张拉方案，通过频率法测试索力对吊杆张拉和索力调整施工阶段的索力进行实时监控，并对关键截面应力、位移进行了监测。对各次监测结果进行综合分析验证了本文中方法的有效性。
[Abstract]:Concrete-filled steel tubular tied arch bridge is a new type of beam-arch composite system bridge.The system is mainly composed of arch rib, tie beam, suspender and so on.As the connection member between the tie beam and arch rib, whether the stress state is reasonable or not will directly affect the behavior of the whole bridge, which will determine the safety and reliability of the bridge.However, in the tied arch bridge, especially for the long-span bridge, the tension of the suspension rod is not in one step. The cable force of the suspension rod needs many tensioning adjustments to meet the requirements of the construction design and the integral alignment of the bridge.The internal statically indeterminate and external statically indeterminate structure system of tied arch bridge and the shrinkage of concrete make the stress state of arch bridge more complicated.Due to the complexity of the structure system, no accurate theoretical calculation can completely replace the field monitoring work during the construction of the bridge.Therefore, it is necessary to monitor the cable force of the suspender and make a detailed and reasonable tensioning scheme according to the monitoring results.On the other hand, during the use of the bridge, the cable force of the suspender will change with the use of the bridge because of the relaxation and stress loss of the suspender itself and the alternating action of traffic load.Engineering practice shows that the degradation of cable force is a stochastic and nonlinear process.Therefore, it is also very important to monitor the cable force of the suspenders during the operation of the bridge.Because of the short effective length of suspension arch bridge, some necessary data are needed for monitoring during bridge operation.The most effective way to obtain the basic data is to monitor the boom during the tension period, which also shows the necessity of construction monitoring during the tension period.Based on the construction supervision and control of the suspension rod of Zhaowanghe River Bridge, the following research work has been carried out in this paper:1. Firstly, the mechanical characteristics of the suspender arch bridge are analyzed briefly. From the security of each component in the construction stage, the task of tension is decomposed, and the key techniques in the process are discussed.2. According to the design parameters, the finite element analysis model of Zhao Wang River Bridge is established by using MIDAS\ Civil.Based on the influence matrix and iterative algorithm combined with the finite element theory analysis model, the construction process of the suspender is simulated, the solution process of the suspender force is analyzed, and the corresponding tensioning scheme is worked out.Through theoretical calculation, the final cable force of suspender arch bridge meets the design requirements.3. Based on the existing vibration theory, the principle of measuring cable force by frequency method is introduced, and three kinds of theoretical calculation models for solving cable force by frequency method are discussed.Considering that in actual engineering, the length of cable, the installed dampers, and the flexural stiffness will have a certain impact on the model, the model can be modified or combined with some new algorithms to get more accurate results.A method for calculating cable force based on vibration test is developed.4. Combining with the actual project, according to the tensioning scheme, the cable force in the construction stage of the cable tension and the cable force adjustment is monitored by the frequency test method, and the stress and displacement of the key section are monitored.The effectiveness of this method is verified by comprehensive analysis of the monitoring results.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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