波形钢腹板变截面连续体系梁桥剪力传递分析

发布时间：2018-04-28 22:35

本文选题：波形钢腹板 + 剪应力分布　；参考：《郑州大学》2014年硕士论文

【摘要】：波形钢腹板预应力混凝土组合箱梁桥是一种新型组合结构桥梁，现有对波形钢腹板抗剪特性的研究通常只是进行简单定性的描述，偏保守地认为波形钢腹板承担截面上的全部剪力，混凝土顶底板不参与承剪，但是这与波形钢腹板箱梁结构实际受力状态有差异。本文依托武西高速公路桃花峪黄河大桥跨大堤桥工程，建立有限元模型，对波形钢腹板的剪力传递效率展开研究，主要工作内容及结论如下。 1.总结波形钢腹板组合梁桥的发展概况，明确其技术特点，对国内外相关研究现状进行综述。国外研究主要集中在波形钢腹板的抗剪屈曲和极限承载力等方面，国内则侧重于对其静力特性方面的研究，并对其剪力传递做了一些定性的描述，然而这些研究大都是针对等截面小跨度简支梁进行的，对于大跨度变截面组合连续梁桥的研究较少。 2.结合武西高速公路桃花峪黄河大桥跨大堤桥，分别应用Midas/Civil和Midas/FEA建立该桥的空间梁单元和实体单元有限元模型，将仅在自重和预应力作用下两种软件的计算结果进行对比分析，，结果表明两种模型的计算结果趋近一致，可以作为后续剪力传递效率数值分析的理论模型。 3.以Midas/FEA实体模型为基础，选取主梁代表性截面，考虑自重单独作用、自重和预应力共同作用及满布活载三种荷载工况，分析混凝土顶底板和波形钢腹板中的剪力传递情况，数据表明变截面效应下弯矩和轴力产生的附加剪应力对腹板剪应力分布影响较大，使得在梁高增加时波形钢腹板的承剪比下降，混凝土顶底板承剪份额增加，这与等截面波形钢腹板简支箱梁桥的剪力传递效率存在明显差异。 4.推导变截面波形钢腹板箱梁剪应力计算公式，将其与FEA模型数值解和依据等截面剪应力计算公式所得的计算结果进行对比，验证公式的正确性。
[Abstract]:Corrugated steel web prestressed concrete composite box girder bridge is a new type of composite structure bridge. It is considered conservatively that the corrugated steel webs bear all the shear force on the section and the concrete top and bottom slab does not participate in the shear but this is different from the actual stress state of the corrugated steel web box girder structure. Based on the project of Taohuayu Yellow River Bridge of Wuxi Expressway, the finite element model is established to study the shear transfer efficiency of the corrugated steel web. The main contents and conclusions are as follows. 1. This paper summarizes the development of corrugated steel web composite girder bridge, clarifies its technical characteristics, and summarizes the related research status at home and abroad. The research abroad mainly focuses on the shear buckling and ultimate bearing capacity of the corrugated steel web plate, while the domestic research focuses on its static characteristics, and makes some qualitative description of its shear transfer. However, most of these researches are aimed at small span simple supported beams with equal cross-section, but there are few researches on long-span composite continuous beam bridges with variable cross-section. 2. The finite element models of spatial beam element and solid element of the bridge are established by using Midas/Civil and Midas/FEA in combination with the bridge across the main embankment of Taohuayu Yellow River Bridge of Wuxi Expressway. The calculation results of the two kinds of software only under the action of self-weight and prestress are compared and analyzed. The results show that the calculated results of the two models are consistent and can be used as a theoretical model for numerical analysis of shear transfer efficiency. 3. Based on the Midas/FEA solid model, this paper selects the representative section of the main beam, and analyzes the shear force transfer in the concrete roof and bottom slab and the corrugated steel web, considering the single action of the deadweight, the joint action of the deadweight and the prestress and the full load condition. The data show that the additional shear stress caused by bending moment and axial force has a great influence on the distribution of web shear stress, which makes the shear ratio of corrugated steel web plate decrease with the increase of beam height, and the shear share of concrete roof and bottom slab increases. There is a significant difference between the shear transfer efficiency and the shear transfer efficiency of the equal-section corrugated steel web simply supported box girder bridge. 4. The formula for calculating shear stress of corrugated steel box girder with variable section is deduced and compared with the numerical solution of FEA model and the calculation result based on the formula of equal section shear stress. The correctness of the formula is verified.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.213

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