基于梁格法的变宽异型连续箱梁桥结构行为研究
发布时间：2019-05-30 08:51
【摘要】：在公路互通和城市立交中,为使结构线形顺畅,通常需设置变宽度异型桥梁作为主桥连接匝道的过渡桥梁。由于该类型桥构造较为特殊,在力学行为方面比一般箱梁桥显得更为复杂,表现出明显的空间受力特性,这种结构与受力上的复杂性给设计增添了一定的难度。目前而言,对变宽异型桥的研究主要集中在计算方法和模型试验上,很少对异型桥的受力特性进行专门的分析研究,因此针对此类桥梁结构在力学特性方面展开研究,具有很好的理论价值和工程实际意义。本文以某互通式立交桥左幅第五联主线桥为工程背景,研究的主要内容及得出的结论如下:1.系统论述梁格法分析箱梁结构的基本原理,归纳总结不同箱室结构的梁格划分方式和方法;通过实际建模分析,就梁格法进行有限元建模的相关问题进行了探讨,总结出梁格法分析变宽异型桥的建模要点。2.以板单元模型作为参照,在代表性工况下与梁格模型就支座反力、主梁挠度变形以及应力方面进行对比分析,模型计算结果表明:采用梁格法在计算变宽异型桥力学特性方面可以满足精度要求。3.为探究支座布置形式对变宽异型桥受力的影响,分析比较三种支座布置方案在主梁内力以及支座反力方面的差异,得出支座布置对结构受力的影响变化规律,给出了异型桥支座布置建议。4.以实际工程探究支点横梁刚度以及跨中横隔板设置对变宽异型桥受力特性的影响,结合结构力学行为规律给出变宽异型桥的横隔板布置建议,为同类型桥的设计提供一定的参考。5.依据对变宽异型连续箱梁桥受力特性以及梁格法理论的研究成果,开展结构荷载试验研究,与实际测量数据进行对比分析,验证该桥模型在梁格划分以及刚度计算的合理性,同时为该类型桥的荷载试验提供参考。
[Abstract]:In order to make the structure linear smooth, it is usually necessary to set up the special-shaped bridge with variable width as the transitional bridge of the main bridge connecting ramp in the process of highway interworking and urban interchange. Because of the special structure of this type of bridge, the mechanical behavior of this type of bridge is more complex than that of the general box girder bridge, and it shows obvious spatial stress characteristics. The complexity of this structure and force adds a certain degree of difficulty to the design. At present, the research on variable width special-shaped bridge mainly focuses on the calculation method and model test, and few special analysis and research on the mechanical characteristics of special-shaped bridge are carried out, so the mechanical properties of this kind of bridge structure are studied. It has good theoretical value and engineering practical significance. In this paper, based on the engineering background of the fifth main line bridge on the left side of an interchangeable overpass, the main contents and conclusions of the study are as follows: 1. This paper systematically discusses the basic principle of analyzing box girder structure by beam grid method, and sums up the methods and methods of beam lattice division of different box room structures. Through the actual modeling analysis, the related problems of finite element modeling by beam grid method are discussed, and the modeling points of variable width special-shaped bridge analyzed by beam grid method are summarized. 2. Taking the plate element model as a reference, the support reaction force, deflection deformation and stress of the main beam are compared and analyzed with the beam lattice model under representative working conditions. The results of model calculation show that the beam lattice method can meet the accuracy requirements in calculating the mechanical properties of special-shaped bridges with variable width. In order to explore the influence of bearing arrangement on the force of special-shaped bridge with variable width, the differences of internal force and reaction force of main beam in three kinds of bearing arrangement schemes are analyzed and compared, and the influence law of bearing arrangement on structural force is obtained. Some suggestions on the arrangement of special-shaped bridge supports are given. 4. This paper probes into the influence of the stiffness of the beam at the fulcrum and the setting of the transverse partition in the middle of the span on the mechanical characteristics of the special-shaped bridge with variable width, and puts forward some suggestions for the arrangement of the diaphragm of the special-shaped bridge with variable width according to the law of the mechanical behavior of the structure. It provides a certain reference for the design of the same type of bridge. 5. Based on the research results of the stress characteristics of variable width special-shaped continuous box girder bridge and the theory of beam lattice method, the structural load test research is carried out, and the actual measurement data are compared and analyzed to verify the rationality of the bridge model in beam lattice division and stiffness calculation. At the same time, it provides a reference for the load test of this type of 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】：2017
【分类号】：U448.213
本文编号：2488701
[Abstract]:In order to make the structure linear smooth, it is usually necessary to set up the special-shaped bridge with variable width as the transitional bridge of the main bridge connecting ramp in the process of highway interworking and urban interchange. Because of the special structure of this type of bridge, the mechanical behavior of this type of bridge is more complex than that of the general box girder bridge, and it shows obvious spatial stress characteristics. The complexity of this structure and force adds a certain degree of difficulty to the design. At present, the research on variable width special-shaped bridge mainly focuses on the calculation method and model test, and few special analysis and research on the mechanical characteristics of special-shaped bridge are carried out, so the mechanical properties of this kind of bridge structure are studied. It has good theoretical value and engineering practical significance. In this paper, based on the engineering background of the fifth main line bridge on the left side of an interchangeable overpass, the main contents and conclusions of the study are as follows: 1. This paper systematically discusses the basic principle of analyzing box girder structure by beam grid method, and sums up the methods and methods of beam lattice division of different box room structures. Through the actual modeling analysis, the related problems of finite element modeling by beam grid method are discussed, and the modeling points of variable width special-shaped bridge analyzed by beam grid method are summarized. 2. Taking the plate element model as a reference, the support reaction force, deflection deformation and stress of the main beam are compared and analyzed with the beam lattice model under representative working conditions. The results of model calculation show that the beam lattice method can meet the accuracy requirements in calculating the mechanical properties of special-shaped bridges with variable width. In order to explore the influence of bearing arrangement on the force of special-shaped bridge with variable width, the differences of internal force and reaction force of main beam in three kinds of bearing arrangement schemes are analyzed and compared, and the influence law of bearing arrangement on structural force is obtained. Some suggestions on the arrangement of special-shaped bridge supports are given. 4. This paper probes into the influence of the stiffness of the beam at the fulcrum and the setting of the transverse partition in the middle of the span on the mechanical characteristics of the special-shaped bridge with variable width, and puts forward some suggestions for the arrangement of the diaphragm of the special-shaped bridge with variable width according to the law of the mechanical behavior of the structure. It provides a certain reference for the design of the same type of bridge. 5. Based on the research results of the stress characteristics of variable width special-shaped continuous box girder bridge and the theory of beam lattice method, the structural load test research is carried out, and the actual measurement data are compared and analyzed to verify the rationality of the bridge model in beam lattice division and stiffness calculation. At the same time, it provides a reference for the load test of this type of 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】：2017
【分类号】：U448.213
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