钢桁梁斜拉桥施工控制

发布时间：2018-03-02 21:28

本文选题：钢桁梁斜拉桥　切入点：施工控制　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：由于斜拉桥具有跨越能力大的特点,在我国跨江跨河桥梁中占据主导地位。其中,钢桁梁斜拉桥由于能够同时满足运输公铁线路的要求,越来越受到桥梁设计者的青睐。为了确保分阶段成形的钢桁梁斜拉桥最终达到理想的设计状态,对钢桁梁斜拉桥的施工控制进行研究极为必要。钢桁梁斜拉桥由于其特定的主梁形式,施工控制又有特殊之处。本文在综述前人研究的基础上,以荆州公铁两用桥为工程背景,从总体和实用的角度,总结并研究了钢桁梁斜拉桥的施工控制方法。论文的主要工作如下:(1)使用3DBridge有限元软件建立荆州长江公铁两用桥分阶段施工有限元模型,利用无应力状态控制法确定出双塔钢桁梁斜拉桥各施工阶段的理想状态,并把分阶段施工桥梁的最终状态与设计一次成桥状态进行对比,二者是吻合的。(2)在调整施工中理论状态与实际状态的误差时,从无应力状态量、荷载和结构体系三个方面对设计参数误差进行归类,说明了以"相对拔出量"控制斜拉索到位张拉来减小施工误差的原理,并按照实际施工条件选取了引起钢桁梁斜拉桥施工状态误差的主要设计参数为:主塔刚度、拉索刚度、主梁自重、主梁刚度,然后采用改进的最小二乘法原理,选取一个"拉索—架梁"的典型工况分别依靠"平差调索"和参数识别对误差进行调整,取得了理想的效果。(3)研究了钢桁梁双斜杆合龙口的合龙技术,按照施工难易程度和对合龙口构件的保护能力提出合龙方案。通过有限元模型计算确定出每一步合龙对接时的调整措施和调整量,并对实际合龙时可能出现的不利状况提出预警方案,最后介绍了荆州桥采用上述方案后的实际合龙过程及效果。本论文研究成果对于指导钢桁梁斜拉桥施工控制具有重要理论参考价值。
[Abstract]:Because cable-stayed bridges have the characteristics of large span capacity, they occupy a dominant position in the cross-river bridges in China. Among them, the steel-truss cable-stayed bridges can meet the requirements of the transport road and rail lines at the same time. In order to ensure that the steel-truss girder cable-stayed bridge formed by stages finally reaches the ideal design state, It is very necessary to study the construction control of steel truss cable-stayed bridge. Because of its special main beam form, the construction control of steel truss cable-stayed bridge has its special features. In this paper, the construction control method of steel truss cable-stayed bridge is summarized and studied from the overall and practical point of view. The main work of this paper is as follows: 1) using 3DBridge finite element software to establish the three-stage finite element model for the construction of Jingzhou Yangtze River double-purpose bridge. The ideal state of double-tower steel truss girder cable-stayed bridge is determined by using the stress-free state control method, and the final state of the bridge is compared with that of the designed primary bridge. When adjusting the errors between the theoretical state and the actual state in construction, the errors of design parameters are classified from three aspects: the quantity of stress free state, the load and the structure system. This paper explains the principle of using relative pull out quantity to control the cable in place tension to reduce the construction error. According to the actual construction conditions, the main design parameters that cause the construction state error of the steel truss girder cable-stayed bridge are selected as follows: the main tower stiffness and the cable stiffness. The deadweight and stiffness of the main beam, and then adopting the principle of the improved least square method, select a typical condition of "cable-beam" to adjust the error by "adjustment cable" and parameter identification, respectively. The ideal effect is obtained. (3) the closing technology of steel truss beam with double inclined bars and the closing of the opening is studied. According to the degree of difficulty in construction and the protection ability of the involutive Longkou members, the closure scheme is put forward. The adjustment measures and the adjustment amount of each step are determined by the finite element model calculation. And put forward an early warning plan for the adverse situation that may occur when the actual closure occurs. Finally, the actual closure process and effect of Jingzhou Bridge after adopting the above scheme are introduced. The research results of this paper have important theoretical reference value for guiding the construction control of steel truss cable-stayed bridge.
【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

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