摘要
斜拉桥是将主梁用拉索直接拉在索塔上的一种桥梁,作为一种拉索体系,比梁式桥的跨越能力更大,是大跨度桥梁的最主要桥型。目前,斜拉桥普遍采用悬臂挂篮施工的方法施工,由于桥梁跨度较大,双悬臂状态对结构受力很不利。而且斜拉桥属于高次超静定结构,主梁和拉索又具有几何非线性,施工状态和成桥状态又有明显的体系转换之分,这些影响都必然给桥梁结构的受力和成桥线形带来很大的变化,所以对斜拉桥施工过程进行准确的模拟分析和施工控制尤为重要。本文主要结合湖北襄阳汉江三桥主桥的设计资料和施工监控实践,围绕着混凝土斜拉桥施工控制与模拟进行了较为深入的分析和研究。
首先介绍斜拉桥施工中开展施工监控的必要性,针对斜拉桥施工监控和模拟分析方法展开深入的研究;其次介绍目前常用的结构几何非线性分析的基本方法,并对斜拉桥的几何非线性影响因素和相应的处理方法进行详细的分析,包括斜拉索的垂度效应、大变形效应和梁—柱效应,并讨论各种方法的适用范围;最后根据实际工程背景建立有限元模型,对斜拉桥的合理成桥状态和施工过程进行模拟分析和数据处理。
针对建设中的汉江三桥主桥工程,进行建模仿真分析是本文的核心内容。在充分了解该工程施工工序的前提下,参考相关桥梁施工控制的理论与方法,利用大型桥梁分析软件Midas/Civil,建立三维空间计算模型。采用零位移法确定合理的成桥状态,采用未闭合配合力功能求解斜拉索施工初始张拉力,然后对该斜拉桥施工过程进行正装模拟计算,得到各施工阶段下的主梁内力、挠度、索塔应力和拉索内力,并选择施工最危险的几个阶段进行重点受力分析,得出了一些有价值的结论并分析了具体计算中存在的一些问题,以便今后做进一步的研究。
Cable-stayed bridge is a system that the beam is taken into a tower directly according to some cables, which is one of large span bridges all over the world because of its large span ability. For the present, The cable-stayed bridge uses the bracket to hang the basket construction generally, Because the bridge span is large, the twin cantilevers condition is very disadvantageous to the structure stress. Moreover the cable-stayed bridge belongs to the higher mode ultra statically determinate structure, the beam and the cable also has the geometry misalignment, there has obvious system transformation between construction condition and bridge condition, these influences inevitably turn the structure stress and linear around, therefore carrying on an accurate simulation analysis and constructs control to the cable-stayed bridge during the construction is especially important. This article mainly has carried on a more thorough analysis and research revolving the concretes cable-stayed bridge construction controlling and the simulation analysis, which combined with the design information and the construction monitoring practice of the hanjiang third bridge in hubei xiangyang.
At first it introduced that the carrying out the construction monitoring during the cable-stayed bridge construction is necessary, then launched the further research in view of the cable-stayed bridge construction monitoring and the simulation analysis method. Secondly it introduced present used structure geometry essential method for nonlinear analysis, and carried on the detailed analysis to the geometry misalignment influenced factor and the process method of the cable-stayed bridge, which included the slanting back guy's dip effect, the big texturing effect and the Liang - column effect, and discussed the applicable scope for each method; Finally carrying on the simulation analysis and the data processing in connection with the bridge condition and the construction process based on the Finite element model.
In view of the Hanjiang third bridge, carrying on the simulation and analysis is the central content in this article. In understand fully this project actual construction working procedure under the premise, referred to the theory and the method of the related bridge construction control, using large-scale bridge analysis software Midas/Civil to establish the three-dimensional computation model. Using zero-displacement method to determine reasonable Cheng Qiao condition, based on which using the closed combining ability function to solve initial tensioning force before the construction, then carrying on the actual construction simulation analysis in turn. It can obtain the beam interior force、the amount of deflection、the rope tower stress and the cable interior force under each construction stage, and chooses the most dangerous several stages to carry on the major analysis, it has drawn some valuable conclusions and analyzed some questions which in the concrete computation, so that doing the further research later.
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