【作者】 张志伟；

【导师】 蔡金标；

【作者基本信息】 浙江大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 自锚式悬索桥是近些年来发展较快的一种桥型,特别是对地基条件和景观要求较高的地区,自锚式悬索桥以其独特的优势越来越受到设计人员的青睐。本文以一座在建的自锚式悬索桥—浙江三门县大湖塘新区景观桥为工程实例,系统地阐述了施工控制中主缆线形的计算方法,施工控制的基本理论,以及基于优化原理的吊杆张拉的优化方法。(1)主缆线形的计算是自锚式悬索桥施工控制中的首要步骤,本文重点介绍了根据设计单位提供的数据来对主缆线形进行计算的数值方法:首先计算出成桥的线形,进而计算出主缆的无应力长度,空缆状态以及吊点的空缆坐标。本文还简单介绍了采用有限元软件计算空缆的状态的迭代方法。(2)自锚式悬索桥施工控制首先要明确施工控制的目标,内容以及采用的方法。本文重点介绍了自适应控制方法涉及到的施工控制过程中的误差分析,参数识别以及状态调整的一些理论以及这些相关的理论在自锚式悬索桥施工控制中的应用。(3)针对索鞍无预偏自锚式悬索桥的吊杆张拉施工过程,本文基于控制理论及优化原理,提出了利用软件Matlab优化箱对吊杆张拉的过程进行优化的方法,这在一定程度上减少了吊杆张拉过程中的吊杆力施加的盲目性。(4)本文还基于Midas/Civil软件建立了全桥有限元计算模型,采用程序自带的施工过程模块来对真实施工过程进行模拟,对加劲梁的应力和挠度进行了计算,并与实测值进行比较,调整了模型的参数。最后将吊杆张拉优化的结果代入有限元模型,进行吊杆张拉的计算。结果显示,优化的结果很好地满足了模拟施工的要求。更多还原

【Abstract】 Self-anchored suspension bridge, as a rapidly developed type of bridge in recent years, are widely concerned by the designers because of its unique advantage, especially in the district with high demands of ground conditions or remarkable shape. In this paper, based on a self-anchored suspension bridge under construction, the computing method of configuration of main cable is proposed and some basic theory of construction control are introduced and an optimization method, based on optimization principles, is provided in the hanger-tensioning construction.(1) That the calculation of the configuration of main cable is the first step in construction control of self-anchored suspension bridge. The numerical methods according to the data provided by the design units are introduced in this paper. Firstly the final bridge line is calculated then the non-stress length of main cable, empty cable shape, and the coordinates of hanging point. An iterative methods based on the finite element software is proposed to calculate the state of the empty cable in this paper.(2) At first, the objectives, contents and methods of construction control should be made clearly. Some theories of error analysis, parameter identification and state adjustment as well as the applications of these theories in the construction control of self-anchored suspension bridge are introduced in the adaptive control method.(3) Optimization analysis of hanger-tension of self-anchored suspension bridge with non-pre-bias of cable-saddle, which take advantage of the Matlab programming software, are proceeded in this paper based on control theory and optimization theory. It can reduce the blindness in the construction of the hanger-tension to some extent.(4) Finally, a finite element model with the optimal results is established by using finite element software Midas/Civil to simulate the construction processes of hanger-tension. The results have showed that the results of optimization meet the simulated construction requirements efficiently.更多还原