基于不同施工进度下多跨连续梁桥合拢顺序的研究

发布时间：2018-01-28 12:21

本文关键词： 多跨连续梁桥合拢顺序悬臂段龄期差异　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：随着我国交通建设的迅猛发展,多跨连续梁桥得到了很大的发展,随着多跨连续梁桥跨数越来越多,跨度越来越大,合拢问题的研究也越来越多,本文结合衡阳耒河某多跨连续梁桥,并结合施工监控数据,来分析合拢顺序,主要工作和成果如下： 1.查阅了大量的有关多跨连续梁桥的合拢顺序资料,对多跨连续梁桥的发展情况以及施工特点、合拢工序进行了大量的研究,比较了施工监控实测数据与MIDAS有限元软件计算的理论数据,总结了国内多跨连续梁桥的合拢工序。 2.运用大型空间有限元软件MIDAS分析了六跨连续梁桥的七种施工合拢顺序,比较各方案的内力、挠度、应力,得出了较优的施工合拢顺序。 3.分析了四跨连续梁桥在中墩施工延期后的施工合拢顺序,并比较了中墩延后施工情况下的四种合拢顺序的内力、挠度、应力。结合分析各工况的下的内力、挠度、应力,可以得出在实际施工过程中我们应该尽量避免产生相邻悬臂段出现龄期差异,当实际施工条件或者其它因素影响而不能实现所有悬臂段同时施工时,对于本章所研究的四跨连续梁桥来说,应尽可能在中墩施工前将边跨合拢这样不仅可以改善悬臂段的挠度也可以增加其稳定性以及成桥后桥梁的内力特性。 4.对于本文研究的四跨连续梁桥的施工合拢情况,当无法避免中墩及悬臂段施工延后时,可以先合拢边跨等中墩及悬臂段施工完成后再进行中跨合拢,此方法施工时边墩右侧悬臂段挠度和应力由于边跨的合拢,挠度和应力较不优先合拢边跨合拢段时有所增大,本文提出边跨合拢完成后,提前加载混凝土湿重以及挂篮荷载至悬臂段截面,此时施工阶段挠度和应力情况有明显的改善。
[Abstract]:Absrtact: with the rapid development of traffic construction in our country, multi-span continuous beam bridge has been greatly developed, with the number of multi-span continuous beam bridge more and more, the span is becoming larger and larger, and the research on closure problem is becoming more and more. Combined with a multi-span continuous beam bridge in Hengyang Leihe River and construction monitoring data, this paper analyzes the closure sequence. The main work and results are as follows: 1. A great deal of information about the closure sequence of multi-span continuous beam bridge is consulted. The development and construction characteristics of multi-span continuous beam bridge are studied. This paper compares the measured data of construction monitoring with the theoretical data of MIDAS finite element software, and summarizes the closing procedure of multi-span continuous beam bridge in China. 2. By using the large spatial finite element software MIDAS, seven kinds of construction closure sequences of six-span continuous beam bridge are analyzed, and the internal force, deflection and stress of each scheme are compared, and a better construction closure sequence is obtained. 3. The construction closure sequence of four-span continuous girder bridge after delayed construction of middle pier is analyzed, and the internal force and deflection of the four closure sequence are compared under the condition of delayed construction of middle pier. Stress. Combined with the analysis of the internal force, deflection, stress under each working condition, we can draw the conclusion that in the actual construction process, we should avoid the age difference of adjacent cantilever segment as far as possible. When the actual construction conditions or other factors can not achieve all the cantilever construction at the same time, for the four-span continuous beam bridge studied in this chapter. The side span should be closed as far as possible before the construction of the middle pier so as to improve not only the deflection of the cantilever but also the stability of the cantilever and the internal force characteristics of the bridge after completion. 4. For the construction closure of the four-span continuous beam bridge studied in this paper, when the construction of the middle pier and the cantilever section cannot be avoided, the middle pier and cantilever section can be closed after the completion of the construction of the same middle pier and cantilever section. The deflection and stress of the cantilever section on the right side of the side pier are increased in this method because of the closure of the side span. When the wet weight of concrete and hanging basket load to the section of cantilever section are loaded in advance, the deflection and stress in construction stage are obviously improved.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445;U448.215

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