下承式钢管拱桥落梁法成桥施工控制

发布时间：2018-01-09 03:12

本文关键词：下承式钢管拱桥落梁法成桥施工控制　出处：《广西大学》2014年硕士论文　论文类型：学位论文

【摘要】：下承式钢管拱桥是一种比较常见的桥型,其体系转换施工通常采用吊索张拉法进行,吊索张拉法有比较成熟的理论和工程实践经验,但有调索过程复杂、施工周期长的缺点。落梁法体系转换施工能够避免这些缺点：通过吊装钢箱梁的临时支墩顶升钢箱梁,然后无应力安装吊杆,最后卸落钢箱梁完成体系转换的目的。落梁法施工无需反复调索,可以大大缩短施工周期。本文研究的是落梁成桥施工的控制方法,主要包括以下几个方面： 1.本文采用有限元建模分析、最优化控制方法在落梁施工前对其进行优化控制,采用开环控制法、最大宽容度法对落梁施工过程进行控制,旨在能够得出一套能够通用于落梁法成桥施工的控制方案。 2.对于落梁法的最优化控制,本文列出了三种目标函数模型：最小二乘法、最小能量法以及梁-拱-索三控法。分别用三种方法对同一个落梁法施工算例进行优化分析,对比三种方法的优劣,结果表明：梁-拱-索三控法对落梁法施工过程的控制效果最好。 3.以越南龙桥为例,对其落梁施工过程进行优化控制分析,指导工程施工,结果表明,对龙桥落梁法成桥施工的控制达到了设计和规范要求,说明了控制方法的合理性与可行性。
[Abstract]:Through steel tube arch bridge is a relatively common type, the system conversion construction usually adopts the sling tension method, cable tension method has more mature theory and practice experience, but the cable adjustment process complex, long construction period faults. Beam falling law system conversion construction to avoid these disadvantages: the temporary support pier lifting steel box girder lifting steel box girder, and stress free installation of hangers, finally landed complete system conversion. Steel box girder falling construction method without repeatedly adjusting cable, can greatly shorten the construction period. This paper is a study of the beam falling into control method of bridge construction, mainly including the following aspects:
1. this paper uses the finite element modeling, optimization control method in beam falling before the construction of its optimization control, the open-loop control method, maximum tolerance method to control the girder falling construction process, in order to obtain a set of control in general can drop the beam into a bridge construction case.
2. for optimal control fall beam method, this paper lists three kinds of objective function model: least squares method, minimum energy method and beam - arch - cable three control method. Three methods were used on the same beam falling construction method example optimization analysis, comparative advantages and disadvantages of three methods, the results showed that: Beam-Arc - best three cable control method for the control effect of the construction process of beam method.
3. to Vietnam Longqiao as an example, the girder falling construction process control and optimization analysis, guide the engineering construction, the results show that the design meets the requirements and specifications for control of long beam falling into a bridge construction, illustrates the rationality and feasibility of the control method.

【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22;U445.4

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