先简支后连续波形钢腹板钢箱组合梁的设计方法研究

发布时间：2018-06-11 11:11

本文选题：波形钢腹板 + 先简支后连续　；参考：《河北工业大学》2015年硕士论文

【摘要】：京港澳高速公路改扩建保定互通位于施工图设计里程K131+395处,互通内设有9条匝道,本科研依托工程为A匝道跨七一路匝道桥,该桥为4×25m先简支后连续部分预应力波形钢腹板钢箱组合连续梁结构。波形钢腹板钢箱组合梁作为一种新型组合结构,充分利用了钢材抗剪、抗拉能力强和混凝土抗压能力大的力学特性,采用波形钢腹板代替混凝土腹板有效地减轻结构自重。先简支后连续结构体系实现了桥梁工厂化批量预制生产,减少桥面伸缩缝,保证了桥梁质量,满足现在桥梁建设以及车辆行驶的要求。本文研究内容主要分为四大部分:第一部分为波形钢腹板组合梁桥的发展现状,先简支后连续结构的研究背景、研究现状以及先简支后连续结构体系的优缺点等;第二部分为先简支后连续梁桥的分析理论和方法;第三部分为先简支后连续波形钢腹板钢箱组合梁桥成桥状态单、双支座的讨论,负弯矩区的处理方法优化设计,波形钢腹板组合箱梁承载能力验算;第四部分为先简支后连续梁桥合理施工顺序分析,主要对后连续端浇筑顺序、临时支座拆除顺序进行分析。本文以4×25m先简支后连续波形钢腹板箱组合梁桥为依托进行研究,首先结合理论分析和Midas Civil模型分析不同荷载工况下单、双支座主梁受力,提出单支座形式适合本工程实际;其次负弯矩区作为连续梁的受力薄弱部位在桥梁建设中应进行特殊处理,对强配筋法、支座顶升法、静载预压法三种负弯矩区处理方案进行优化比选,确定强配筋法为最佳方案;然后结合Ansys有限元模型对本工程实桥的承载能力进行了验算,验算结果表明波形钢腹板组合箱梁桥的整体结构性能良好。最后,利用Midas Civil模型分析后连续端部不同浇筑顺序以及临时支座不同拆除顺序时主梁受力,给出最佳施工顺序分别是顺序浇筑、对称拆除。
[Abstract]:Baoding Interchange of Beijing, Hong Kong and Macao Expressway is located at K131 395, where the design mileage of construction drawing is K131 395, and there are 9 ramps in the interworking. The bridge is composed of 4 脳 25m simple supported and then partially prestressed steel web steel box composite beam structure. As a new type of composite structure, the steel box composite beam with corrugated steel webs makes full use of the mechanical properties of steel, such as shear resistance, strong tensile capacity and high compressive capacity of concrete. The use of corrugated steel web plate instead of concrete web plate can effectively reduce the structural weight. The system of simple support and then continuous structure realizes the batch production of the bridge, reduces the expansion joint of the bridge deck, ensures the quality of the bridge, and meets the requirements of the bridge construction and vehicle running. The main contents of this paper are divided into four parts: the first part is the development of the corrugated steel web composite beam bridge, the research background of the simple support and then the continuous structure, the research status and the advantages and disadvantages of the simple support and the continuous structure system, etc. The second part is the analysis theory and method of the simple support and continuous beam bridge, the third part is the discussion of the state of the bridge, the discussion of the double supports and the optimal design of the treatment method of the negative bending moment region. The fourth part is the analysis of the reasonable construction sequence of the first simple support and then the continuous beam bridge, mainly to the sequence of pouring at the back continuous end and the order of removing the temporary support. This paper is based on 4 脳 25m steel web box composite girder bridge with simple support and continuous wave shape. Firstly, combined with theoretical analysis and Midas Civil model, the stress of single and double bearing main beam under different load conditions is analyzed, and the single support form is put forward to suit the actual condition of the project. Secondly, as the weak position of continuous beam, special treatment should be carried out in the construction of bridge, and three kinds of treatment schemes of negative moment region, such as strong reinforcement method, pedestal jacking method and static load preloading method, should be optimized and selected. The method of strong reinforcement is determined as the best scheme, and then combined with the Ansys finite element model, the bearing capacity of the bridge is checked and calculated. The results show that the integral structure performance of the composite box girder bridge with corrugated steel webs is good. Finally, Midas Civil model is used to analyze the stress of the main beam with different pouring sequence of continuous end and different demolition order of temporary support, and the optimal construction order is respectively sequential pouring and symmetrical demolition.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.5

【共引文献】