波形钢腹板连续刚构桥的结构设计参数与施工过程研究
发布时间：2019-06-03 15:22
【摘要】：波形钢腹板连续刚构桥是使用波形钢板替代传统连续刚构桥中的混凝土腹板形成的组合结构。该体系的主要组成要素包括混凝士顶底板,波形钢腹板和体外预应力束。在波形钢腹板连续刚构桥中,混凝土抗压性能好、波形钢腹板剪切屈曲强度高的优点得到充分地发挥,不仅减少了顶、底板预应力束的损失,还简化了复杂的预埋管道工序。与传统连续刚构桥相比,波形钢腹板连续刚构桥的结构设计更为合理。但通过研究国、内外此类桥型的结构设计参数和施工过程的相关成果后发现,在现阶段的波形钢腹板连续刚构桥的结构设计参数与施工过程中存在负弯矩区内衬混凝土设置参数不确定、体外束极限应力和二次效应计算公式繁多但计算结果相差较大、传统的满堂支架施工方法在大高差边跨段内的施工风险激增等问题。为解决上述问题,论文通过理论研究与实桥设计相结合的方法,分析在实桥设计中波形钢腹板组合连续刚构桥极限承载能力验算等效计算模型的建立方法,探讨内衬混凝土的不同设置参数和体外预应力束极限强度的必要性及其对桥梁抗弯性能的影响,同时研究在高墩节段替代满堂支架方法的新边跨施工方法——“利用波形钢腹板自身刚度替代劲性骨架”法的合理性和可行性。论文研究的主要内容包括：(1)波形钢腹板组合连续刚构桥极限承载能力验算的等效计算模型的建立方法；(2)大高差边跨合龙段的施工过程研究；(3)考虑内衬混凝土效应和体外预应力束极限应力、二次效应的波形钢腹板组合连续刚构桥极限抗弯承载能力；(4)结合设计实例的波形钢腹板组合连续刚构桥的有限元模型力学性能分析；(5)波形钢腹板组合连续刚构桥实桥设计建议。因此,论文将结合跨度为(57+2×100+57)m的兰州北环小砂沟大桥,基于不同参数,通过Midas Civil 2012软件,建立不同条件下的有限元模型,对波形钢腹板连续刚构桥进行结构设计参数与施工过程研究,对此类桥梁的设计提出优化建议并通过实桥的设计计算进行验证,以期为此类波形钢腹板组合连续刚构桥的工程应用提供有益的参考。
[Abstract]:Continuous rigid frame bridge with wavy steel web is a composite structure formed by using waveform steel plate instead of concrete web in traditional continuous rigid frame bridge. The main elements of the system include concrete top and bottom plate, wavy steel web and external prestressed beam. In the continuous rigid frame bridge with wavy steel webs, the advantages of good compressive performance of concrete and high shear and buckling strength of waveform steel webs have been brought into full play, which not only reduces the loss of prestressed bundles of roof and bottom plate, but also simplifies the complex embedded pipeline process. Compared with the traditional continuous rigid frame bridge, the structural design of wavy steel web continuous rigid frame bridge is more reasonable. However, after studying the structural design parameters and the related results of the construction process of this kind of bridge in and out of China, it is found that At present, the structural design parameters of wavy steel web continuous rigid frame bridge are uncertain with the setting parameters of lining concrete in negative moment zone, and there are many formulas for calculating the ultimate stress and secondary effect of external beam, but the calculation results are quite different. The construction risk of the traditional full hall support construction method in the span section of large height difference is surging and so on. In order to solve the above problems, through the combination of theoretical research and real bridge design, this paper analyzes the method of establishing the equivalent calculation model of ultimate bearing capacity of wavy steel web composite continuous rigid frame bridge in the design of real bridge. This paper discusses the necessity of different setting parameters of lined concrete and the ultimate strength of external prestressed bundles and its influence on the bending performance of bridges. At the same time, the rationality and feasibility of the new side span construction method, "replacing the rigid skeleton with the stiffness of the curved steel web", which is used to replace the full support method in the high pier segment, is studied. The main contents of this paper are as follows: (1) the establishment method of equivalent calculation model for checking the ultimate bearing capacity of wavy steel web composite continuous rigid frame bridge, (2) the construction process of large height difference edge span section, (2) the construction process of large height difference edge span section, and (2) the construction process of large height difference edge span section. (3) considering the concrete effect of lining and the ultimate stress of external prestressed beam, the ultimate bending bearing capacity of wavy steel web composite continuous rigid frame bridge is considered. (4) the finite element model mechanical properties analysis of the continuous rigid frame bridge with wavy steel webs combined with the design example, and (5) the design suggestion of the continuous rigid frame bridge with the steel web composite bridge. Therefore, combined with the Xiaoxagou Bridge with a span of (572 脳 10057) m, based on different parameters and Midas Civil 2012 software, the finite element models under different conditions are established in this paper. The structural design parameters and construction process of waveform steel web continuous rigid frame bridge are studied, and the optimization suggestions for the design of this kind of bridge are put forward and verified by the design calculation of the real bridge. In order to provide useful reference for the engineering application of this kind of curved steel web composite continuous rigid frame bridge.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.23
本文编号：2492028
[Abstract]:Continuous rigid frame bridge with wavy steel web is a composite structure formed by using waveform steel plate instead of concrete web in traditional continuous rigid frame bridge. The main elements of the system include concrete top and bottom plate, wavy steel web and external prestressed beam. In the continuous rigid frame bridge with wavy steel webs, the advantages of good compressive performance of concrete and high shear and buckling strength of waveform steel webs have been brought into full play, which not only reduces the loss of prestressed bundles of roof and bottom plate, but also simplifies the complex embedded pipeline process. Compared with the traditional continuous rigid frame bridge, the structural design of wavy steel web continuous rigid frame bridge is more reasonable. However, after studying the structural design parameters and the related results of the construction process of this kind of bridge in and out of China, it is found that At present, the structural design parameters of wavy steel web continuous rigid frame bridge are uncertain with the setting parameters of lining concrete in negative moment zone, and there are many formulas for calculating the ultimate stress and secondary effect of external beam, but the calculation results are quite different. The construction risk of the traditional full hall support construction method in the span section of large height difference is surging and so on. In order to solve the above problems, through the combination of theoretical research and real bridge design, this paper analyzes the method of establishing the equivalent calculation model of ultimate bearing capacity of wavy steel web composite continuous rigid frame bridge in the design of real bridge. This paper discusses the necessity of different setting parameters of lined concrete and the ultimate strength of external prestressed bundles and its influence on the bending performance of bridges. At the same time, the rationality and feasibility of the new side span construction method, "replacing the rigid skeleton with the stiffness of the curved steel web", which is used to replace the full support method in the high pier segment, is studied. The main contents of this paper are as follows: (1) the establishment method of equivalent calculation model for checking the ultimate bearing capacity of wavy steel web composite continuous rigid frame bridge, (2) the construction process of large height difference edge span section, (2) the construction process of large height difference edge span section, and (2) the construction process of large height difference edge span section. (3) considering the concrete effect of lining and the ultimate stress of external prestressed beam, the ultimate bending bearing capacity of wavy steel web composite continuous rigid frame bridge is considered. (4) the finite element model mechanical properties analysis of the continuous rigid frame bridge with wavy steel webs combined with the design example, and (5) the design suggestion of the continuous rigid frame bridge with the steel web composite bridge. Therefore, combined with the Xiaoxagou Bridge with a span of (572 脳 10057) m, based on different parameters and Midas Civil 2012 software, the finite element models under different conditions are established in this paper. The structural design parameters and construction process of waveform steel web continuous rigid frame bridge are studied, and the optimization suggestions for the design of this kind of bridge are put forward and verified by the design calculation of the real bridge. In order to provide useful reference for the engineering application of this kind of curved steel web composite continuous rigid frame bridge.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.23
【引证文献】
相关会议论文 前1条
1 蔺钊飞;刘玉擎;贺君;韩斌;;折腹型内衬混凝土组合梁抗剪性能研究[A];第二十届全国桥梁学术会议论文集（下册）[C];2012年
，本文编号：2492028
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