大跨等截面钢—混凝土连续梁桥静力行为数值研究
发布时间：2018-09-14 11:04
【摘要】：港珠澳大桥浅水区非通航孔桥采用85m钢-混组合连续梁，5～6孔一联。全桥采用大节段整孔吊装、简支变连续、支点顶升及回落、负弯矩区桥面板张拉预应力等施工工艺。组合连续梁桥从施工到成桥状态经历了从简支到连续不同的体系转换，施工次序的变化对连续梁桥的线形及内力也将产生不同的影响。目前，在国内组合连续梁桥还未得到广泛的应用，设计施工技术还不够成熟。但随着有限元计算的快速发展，各种桥梁专业软件得到广泛应用。因此，通过有限元软件开展组合连续梁桥结构内力分析和变化规律分析是十分必要的。 本文以港珠澳大桥为工程背景，以MIDAS/Civil及MIDAS/FEA为技术手段建立港珠澳大桥组合连续梁精细有限元模型，根据施工工序、工况划分及温度影响，，分别对组合连续梁桥大节段整孔吊装、简支变连续体系转换、支点顶升与回落等施工过程及成桥后收缩徐变、温度效应进行了系统的仿真分析，并对工程实例做以参数分析，提出优化方案。本文的研究为组合连续梁桥的设计和施工提供科学依据，对全面掌握大跨径组合连续梁桥的结构线形变化及内力特性，进一步提高组合梁桥的计算分析水平，具有重要的理论和实际意义。 研究的主要内容和成果如下： ①通过有限元桥梁软件MIDAS/Civil建立6×85m组合连续箱梁桥有限元模型，实现了精确仿真分析组合连续梁桥大节段整孔吊装、简支变连续体系转换、支点负弯矩区顶升与回落及预应力张拉的施工过程，并获得了各施工步骤和工况下桥梁结构线形变化及内力分布特征。 ②根据成桥状态下6×85m组合连续梁有限元模型，对组合连续梁桥温度效应、收缩徐变等不同工况作用下进行静力分析，获得了组合连续梁桥在温度荷载及收缩徐变工况下的线形变化及内力分布规律。 ③针对组合梁在施工存梁阶段出现局部失稳现象，通过MIDAS/FEA建立全桥板单元模型，对局部进行参数比较分析，提出组合梁在临时存放阶段合理的支承布置形式、支承垫板合理放置位置、支承加劲肋合理布置位置等及分析得到支座不平整效应对组合梁的应力影响规律。
[Abstract]:In shallow water area of Hong Kong-Zhuhai-Macao Bridge, 85 m steel-mixed composite continuous beam with 5 or 6 holes is adopted. The whole bridge adopts the whole hole hoisting of large segment, the simple support becomes continuous, the fulcrum rises and falls, and the bridge deck is tensioned and prestressed in the negative bending moment area, and so on. The state of composite continuous beam bridge from construction to completion has undergone the transformation from simple support to continuous different systems, and the change of construction order will also have different effects on the alignment and internal force of continuous beam bridge. At present, composite continuous beam bridges in China have not been widely used, design and construction technology is not mature enough. However, with the rapid development of finite element calculation, a variety of bridge professional software has been widely used. Therefore, it is necessary to analyze the internal force and variation law of composite continuous girder bridge by finite element software. In this paper, based on the engineering background of HongKong-Zhuhai-Macao Bridge, the fine finite element model of composite continuous girder of HongKong-Zhuhai-Macao Bridge is established with MIDAS/Civil and MIDAS/FEA as technical means. According to the construction procedure, the partition of working conditions and the influence of temperature, the whole hole of the large segment of composite continuous girder bridge is hoisted separately. The construction process such as the conversion of simple support and continuous system the rise and fall of fulcrum and the shrinkage creep and temperature effect after completion of the bridge are systematically simulated and analyzed. The parameter analysis is made for the engineering example and the optimization scheme is put forward. The research in this paper provides a scientific basis for the design and construction of composite continuous beam bridges, and can improve the level of calculation and analysis of composite beam bridges by comprehensively mastering the structural linear changes and internal force characteristics of long-span composite continuous girder bridges. It has important theoretical and practical significance. The main contents and results of the research are as follows: 1 the finite element model of 6 脳 85m composite continuous box girder bridge is established by the finite element software MIDAS/Civil, and the accurate simulation analysis of the whole hole hoisting of the large segment of the composite continuous girder bridge is realized. The construction process of conversion of simple support to continuous system, rise and fall of fulcrum negative moment area and prestress tensioning, The linear changes and internal force distribution characteristics of the bridge structure under various construction steps and working conditions are obtained. 2 according to the finite element model of 6 脳 85m composite continuous beam under the completed bridge state, the temperature effect of the composite continuous beam bridge is obtained. Under different working conditions, such as shrinkage and creep, static analysis is carried out. The linear variation and internal force distribution of composite continuous beam bridges under temperature load and shrinkage and creep conditions are obtained. (3) in view of the local instability of composite beams during the construction of beam storage, the full bridge plate element model is established by MIDAS/FEA. By comparing and analyzing the local parameters, the paper puts forward the reasonable support arrangement form of composite beam in the temporary storage stage, and the reasonable position of supporting cushion plate. The effect of support unevenness on the stress of composite beam is obtained by analyzing the reasonable position of supporting stiffener and so on.
【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】：U441.5
本文编号：2242522
[Abstract]:In shallow water area of Hong Kong-Zhuhai-Macao Bridge, 85 m steel-mixed composite continuous beam with 5 or 6 holes is adopted. The whole bridge adopts the whole hole hoisting of large segment, the simple support becomes continuous, the fulcrum rises and falls, and the bridge deck is tensioned and prestressed in the negative bending moment area, and so on. The state of composite continuous beam bridge from construction to completion has undergone the transformation from simple support to continuous different systems, and the change of construction order will also have different effects on the alignment and internal force of continuous beam bridge. At present, composite continuous beam bridges in China have not been widely used, design and construction technology is not mature enough. However, with the rapid development of finite element calculation, a variety of bridge professional software has been widely used. Therefore, it is necessary to analyze the internal force and variation law of composite continuous girder bridge by finite element software. In this paper, based on the engineering background of HongKong-Zhuhai-Macao Bridge, the fine finite element model of composite continuous girder of HongKong-Zhuhai-Macao Bridge is established with MIDAS/Civil and MIDAS/FEA as technical means. According to the construction procedure, the partition of working conditions and the influence of temperature, the whole hole of the large segment of composite continuous girder bridge is hoisted separately. The construction process such as the conversion of simple support and continuous system the rise and fall of fulcrum and the shrinkage creep and temperature effect after completion of the bridge are systematically simulated and analyzed. The parameter analysis is made for the engineering example and the optimization scheme is put forward. The research in this paper provides a scientific basis for the design and construction of composite continuous beam bridges, and can improve the level of calculation and analysis of composite beam bridges by comprehensively mastering the structural linear changes and internal force characteristics of long-span composite continuous girder bridges. It has important theoretical and practical significance. The main contents and results of the research are as follows: 1 the finite element model of 6 脳 85m composite continuous box girder bridge is established by the finite element software MIDAS/Civil, and the accurate simulation analysis of the whole hole hoisting of the large segment of the composite continuous girder bridge is realized. The construction process of conversion of simple support to continuous system, rise and fall of fulcrum negative moment area and prestress tensioning, The linear changes and internal force distribution characteristics of the bridge structure under various construction steps and working conditions are obtained. 2 according to the finite element model of 6 脳 85m composite continuous beam under the completed bridge state, the temperature effect of the composite continuous beam bridge is obtained. Under different working conditions, such as shrinkage and creep, static analysis is carried out. The linear variation and internal force distribution of composite continuous beam bridges under temperature load and shrinkage and creep conditions are obtained. (3) in view of the local instability of composite beams during the construction of beam storage, the full bridge plate element model is established by MIDAS/FEA. By comparing and analyzing the local parameters, the paper puts forward the reasonable support arrangement form of composite beam in the temporary storage stage, and the reasonable position of supporting cushion plate. The effect of support unevenness on the stress of composite beam is obtained by analyzing the reasonable position of supporting stiffener and so on.
【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】：U441.5
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本文编号：2242522
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