多跨预应力混凝土连续刚构桥梁合龙方案研究

发布时间：2018-05-28 17:53

本文选题：多跨连续刚构 + 合龙方案　；参考：《重庆交通大学》2014年硕士论文

【摘要】：多跨高墩连续刚构桥梁有整体受力性能好、刚度大、活载作用下竖向变位小、行车舒适性强、超载能力大等优点。但伴随着跨度及跨数的增多,多跨高墩连续刚构桥在施工过程中,结构应力和变形会伴随主梁悬臂长度的增大及体系的转换而改变,且体系转换的顺序对桥梁施工阶段及使用阶段的受力和变形有着重要的影响,选择最佳的合龙方案,可以优化桥梁施工阶段及使用阶段的受力和变形,本文以某六跨连续刚构桥梁为工程背景,开展多跨连续刚构桥梁合龙方案及顶推力研究。运用有限元软件桥梁博士建立桥梁施工仿真模型,进行多种合龙顺序下的施工计算,确定各种合龙方案的顶推力大小。通过对不同合龙方案下桥梁变形、内力、顶推效果的对比分析,确定出最优合龙方案,在此基础上,详细介绍了合龙段及顶推力的施加过程,论文主要研究如下： ①查阅众多资料,归纳总结多跨连续刚构桥的受力特点,及其合龙技术现状,并统计连续刚构桥梁存在的常见合龙段施工病害。介绍了多跨连续刚构桥的合龙工序,总结各合龙方案存在的特点,并对连续刚构桥合龙段施工的主要影响因素进行归纳； ②针对某六跨连续刚构桥梁给出四种合龙方案,结合工程实际建立有限元仿真模型,对各合龙方案的施工线形和内力进行计算； ③给出合龙施工中顶推力的确定方法； ④针对各合龙方案的计算结果开展对比分析,研究不同合龙方案下桥梁线形和内力变化,对比分析各方案的优缺点及效果,确定最优的合龙方案为方案一：边跨→中跨→次中跨。采用本文确定的最终合龙方案,可以保证桥梁在施工及使用阶段的受力和变形均较为合理,对本桥的顺利合龙起着建议性作用,并可以供同类桥梁的合龙参考和借鉴。
[Abstract]:Multi-span high-pier continuous rigid frame bridge has the advantages of good overall mechanical performance, large stiffness, small vertical displacement under live load, strong driving comfort and large overload capacity. However, with the increase of span and number of spans, the stress and deformation of multi-span continuous rigid frame bridge with high piers will change with the increase of cantilever length and system transformation. The sequence of system transformation has an important influence on the stress and deformation of the bridge in the construction stage and the use stage. Choosing the best closure scheme can optimize the force and deformation of the bridge in the construction stage and the use stage. Taking a six-span continuous rigid frame bridge as the engineering background, this paper studies the multi-span continuous rigid frame bridge closure scheme and thrust. The bridge construction simulation model is established by using the finite element software Dr. bridge, and the construction calculation under various closure sequence is carried out, and the top thrust of various closing schemes is determined. Through the comparative analysis of bridge deformation, internal force and thrust effect under different closure schemes, the optimal closure scheme is determined. On the basis of this, the application process of closing segment and top thrust is introduced in detail. The main research in this paper is as follows: The main contents are as follows: 1 referring to many data, the paper summarizes the stress characteristics of multi-span continuous rigid frame bridge and the present situation of closing technology, and statistics the common construction diseases of closure section of continuous rigid frame bridge. This paper introduces the closing procedure of multi-span continuous rigid frame bridge, summarizes the characteristics of each closure scheme, and sums up the main factors affecting the construction of the closure section of the continuous rigid frame bridge. (2) for a six-span continuous rigid frame bridge, four kinds of closing schemes are given, and the finite element simulation model is established in combination with the engineering practice, and the construction alignment and internal force of each closure scheme are calculated. (3) the method of determining the thrust force in closure construction is given. (4) contrasting and analyzing the calculation results of different closure schemes, studying the changes of bridge alignment and internal force under different closure schemes, comparing and analyzing the advantages and disadvantages and effects of each scheme. The optimal closure scheme is determined as the first scheme: side span, middle span. Adopting the final closure scheme determined in this paper can ensure that the force and deformation of the bridge in the construction and use stage are reasonable, which plays a constructive role in the smooth closure of the bridge, and can be used for reference and reference for the similar bridges.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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