大跨斜拉桥主梁受力性能分析

发布时间：2018-01-07 14:03

本文关键词：大跨斜拉桥主梁受力性能分析　出处：《合肥工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：斜拉桥作为一种古老的桥形,出现已经有200多年了。但斜拉桥的快速发展和被广泛应用还是从20世纪70年代开始的。在不到半个世纪的时间里,斜拉桥在世界范围内迅速普及。结构分析的进步、高强材料和施工方法以及防腐技术的发展对于大跨径斜拉桥的发展起到了关键性的作用。随着斜拉桥设计经验的不断积累和桥梁建设先进技术的运用,使得斜拉桥在跨径方面不断的突破世界纪录。本文以半漂浮体系的水阳江混凝土斜拉桥为工程背景,做了以下几个方面的研究工作：1、运用Midas Civil分析该混凝土斜拉桥主梁的整体受力性能,判断主梁施工过程中的不利受力状况。并将最大单悬臂状态和成桥状态的主梁内力,截面应力进行对比分析,总结半漂浮体系的斜拉桥体系转换过程中的内力变化规律。2、在整体分析的基础上,利用Midas FEA有限元软件对主梁节段进行局部分析。研究了在最大单悬臂状态时,主梁截面在自重、纵向预应力和索力的不同荷载组合作用下的正应力分布情况及剪力滞系数的变化。并在此基础上,研究横向预应力对主梁正应力分布及剪力滞系数的影响。3、考虑到斜拉桥主梁宽度越来越大,主梁横向受力效应愈发明显,有必要对宽幅水阳江混凝土斜拉桥主梁进行横向局部分析。将主梁标准截面和横隔板截面在自重、纵向预应力、索力和横向预应力不同荷载组合作用下的横向应力进行了对比研究,总结主梁横向应力的变化规律,对横向预应力的设计及斜拉桥主梁的施工等有一定的参考意义。
[Abstract]:Cable-stayed bridge, as an ancient bridge form, has appeared for more than 200 years. However, the rapid development and wide application of cable-stayed bridge began in 1970s. In less than half a century. Cable-stayed bridges are rapidly popularizing worldwide. Progress in structural analysis. The development of high-strength materials, construction methods and anticorrosion technology plays a key role in the development of long-span cable-stayed bridges. With the continuous accumulation of design experience of cable-stayed bridges and the application of advanced bridge construction technology. This paper takes the semi-floating system of Shuiyang River concrete cable-stayed bridge as the engineering background and does the following research work: 1. Midas Civil is used to analyze the overall mechanical behavior of the main girder of the concrete cable-stayed bridge, and to judge the unfavorable stress condition during the construction of the main beam. The cross-section stress is compared and analyzed, and the variation law of internal force during the transition process of semi-floating cable-stayed bridge is summarized. 2, on the basis of the whole analysis. The local analysis of the segment of the main beam is carried out by using Midas FEA finite element software, and the deadweight of the section of the main beam is studied under the condition of the maximum single cantilever. The distribution of normal stress and the change of shear lag coefficient under different load combinations of longitudinal prestress and cable force. On this basis, the influence of transverse prestress on normal stress distribution and shear lag coefficient of main beam is studied. Considering that the width of the main girder of the cable-stayed bridge is increasing, the transverse force effect of the main beam becomes more and more obvious. It is necessary to carry out transverse local analysis of the main girder of wide width Shuiyang River concrete cable-stayed bridge. The standard section of the main beam and the cross section of the diaphragm are weighed and prestressed longitudinally. The transverse stress of the main beam under different load combinations of cable force and transverse prestress is compared and studied, and the variation law of the transverse stress of the main beam is summarized. It has certain reference significance for the design of transverse prestress and the construction of main girder of cable-stayed bridge.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27

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