梁格法在多室宽箱梁桥中的研究与应用
发布时间：2019-05-06 09:17
【摘要】：随着经济的高速发展，我国交通的现代化建设也如日中天，桥梁建设技术也得到了不断的发展，进而涌现出了一大批新型的桥梁结构形式，桥梁的横向宽度也在不断增加，因此，对工程设计提出了更高的要求。大悬臂的单箱多室宽箱梁截面是目前桥梁中广泛采用的一种截面形式，尤其是在城市快速主干道等公路桥梁中。它具有优良的结构受力性能，但这种桥梁具有腹板间距大、横向翼缘宽、箱壁薄等特点，在对其进行结构设计时，薄壁箱梁结构的受力性能通常较为复杂，截面除了产生剪力之外，还伴随着产生扭转翘曲、畸变等作用。鉴于单箱多室宽箱梁的特殊性，现有的单箱单室箱梁理论已无法对其进行有效计算，因此有必要进一步研究，找到一种合适单箱多室宽箱梁的使用计算方法。 对分析宽箱梁、斜交桥和弯桥等桥梁结构，梁格法是目前设计和科研中常采用的一种颇为有效的桥梁结构空间分析方法，其特点是容易掌握，且对设计能够保证足够的精度，其中采用比较多的方法是剪力—柔性梁格法。其通过建立的等效梁格体系来模拟桥梁上部结构，具有适用条件广、计算效率高、精度合理以及输出合乎现行公路桥涵设计规范等优点，在今后实际工程中将得到更为广泛的应用。 本文首先简述了宽箱梁桥的国内外发展，以及针对宽箱梁的研究方法，讨论了各自的适用范围和优缺点，阐明了梁格法是分析宽箱梁的一种颇为有效的桥梁结构空间分析方法的思想；然后介绍了空间梁格的有限元单元分析法，空间梁单元的每个结点考虑6个自由度；又着重探讨用梁格法对多室宽箱梁结构进行网格化分的基本方法和梁格刚度的取值问题，以及对梁格法的几个关键问题进行了研究对比，同时也探讨一种截面纵向划分的计算方法；最后以一座实际的混凝土连续宽箱梁桥静载试验为工程背景，，用有限元软件Midas/Civil对其建立了梁格法模型，并用Midas/FEA建立的实体单元模型验证了梁格法模型的刚度取值合理性，最后比较分析各静载试验工况数据与梁格模型分析数据结果。 通过分析发现，梁格法模型在一定程度上可以反映实际桥梁结构的受力特点，体现了梁格法概念清晰、便于计算的显著特点，是分析宽箱梁桥的一种有效方法，具有工程实际意义，也为进一步完善箱梁桥结构分析程序奠定了基础。
[Abstract]:With the rapid development of economy, the modernization of transportation in our country is becoming more and more important, the bridge construction technology has also been developed continuously, and a large number of new bridge structure forms have emerged, and the transverse width of the bridge has also been increasing constantly. Therefore, higher requirements for engineering design are put forward. The section of single-box multi-chamber wide box girder with large cantilever is widely used in bridges at present, especially in highway bridges such as urban rapid trunk roads. It has excellent structural performance, but the bridge has the characteristics of large web spacing, wide transverse flange, thin box wall and so on. In the structural design, the mechanical performance of thin-walled box girder structure is usually more complex, and the bridge has many advantages, such as large web spacing, wide transverse flange, thin box wall and so on. In addition to the shear force, the cross section is accompanied by torsional warping, distortion and so on. In view of the particularity of single-box multi-chamber wide box girder, the existing theory of single-box single-chamber box girder can no longer be used to calculate it effectively. Therefore, it is necessary to further study and find a suitable calculation method for single-box multi-chamber wide box girder. For the analysis of bridge structures such as wide box girder, skew bridge and curved bridge, beam lattice method is a very effective spatial analysis method of bridge structure, which is often used in design and scientific research. Its characteristic is that it is easy to master, and it can guarantee enough precision for design. The shear-flexible beam grid method is widely used. The equivalent beam grid system is used to simulate the bridge superstructure. It has the advantages of wide applicable conditions, high calculation efficiency, reasonable precision and output in accordance with the current design code of highway bridges and culverts, and so on. It will be widely used in practical engineering in the future. In this paper, the development of wide box girder bridge at home and abroad and the research methods of wide box girder are briefly introduced, and the application scope, advantages and disadvantages of each are discussed. This paper expounds the idea that the beam lattice method is an effective spatial analysis method for the analysis of wide box girders. Then the finite element analysis method of spatial beam lattice is introduced. Each node of spatial beam element considers 6 degrees of freedom. In addition, the basic method of meshing the multi-room wide box girder structure and the value of the stiffness of the beam lattice are also discussed, and some key problems of the beam grid method are also studied and compared. At the same time, a calculation method of longitudinal division of cross-section is also discussed. Finally, based on the actual static load test of a concrete continuous wide box girder bridge, the beam lattice method model is established by using the finite element software Midas/Civil. The stiffness of the beam-grid model is verified by the solid element model established by Midas/FEA. Finally, the results of the static load test data and the beam-grid model analysis data are compared and analyzed. Through the analysis, it is found that the beam lattice model can reflect the stress characteristics of the actual bridge structure to a certain extent, and it is an effective method to analyze the wide box girder bridge, which reflects the clear concept of the beam lattice method and is convenient for calculation. It is of practical engineering significance and lays a foundation for further perfecting the program of structural analysis of box girder bridges.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.213
本文编号：2470064
[Abstract]:With the rapid development of economy, the modernization of transportation in our country is becoming more and more important, the bridge construction technology has also been developed continuously, and a large number of new bridge structure forms have emerged, and the transverse width of the bridge has also been increasing constantly. Therefore, higher requirements for engineering design are put forward. The section of single-box multi-chamber wide box girder with large cantilever is widely used in bridges at present, especially in highway bridges such as urban rapid trunk roads. It has excellent structural performance, but the bridge has the characteristics of large web spacing, wide transverse flange, thin box wall and so on. In the structural design, the mechanical performance of thin-walled box girder structure is usually more complex, and the bridge has many advantages, such as large web spacing, wide transverse flange, thin box wall and so on. In addition to the shear force, the cross section is accompanied by torsional warping, distortion and so on. In view of the particularity of single-box multi-chamber wide box girder, the existing theory of single-box single-chamber box girder can no longer be used to calculate it effectively. Therefore, it is necessary to further study and find a suitable calculation method for single-box multi-chamber wide box girder. For the analysis of bridge structures such as wide box girder, skew bridge and curved bridge, beam lattice method is a very effective spatial analysis method of bridge structure, which is often used in design and scientific research. Its characteristic is that it is easy to master, and it can guarantee enough precision for design. The shear-flexible beam grid method is widely used. The equivalent beam grid system is used to simulate the bridge superstructure. It has the advantages of wide applicable conditions, high calculation efficiency, reasonable precision and output in accordance with the current design code of highway bridges and culverts, and so on. It will be widely used in practical engineering in the future. In this paper, the development of wide box girder bridge at home and abroad and the research methods of wide box girder are briefly introduced, and the application scope, advantages and disadvantages of each are discussed. This paper expounds the idea that the beam lattice method is an effective spatial analysis method for the analysis of wide box girders. Then the finite element analysis method of spatial beam lattice is introduced. Each node of spatial beam element considers 6 degrees of freedom. In addition, the basic method of meshing the multi-room wide box girder structure and the value of the stiffness of the beam lattice are also discussed, and some key problems of the beam grid method are also studied and compared. At the same time, a calculation method of longitudinal division of cross-section is also discussed. Finally, based on the actual static load test of a concrete continuous wide box girder bridge, the beam lattice method model is established by using the finite element software Midas/Civil. The stiffness of the beam-grid model is verified by the solid element model established by Midas/FEA. Finally, the results of the static load test data and the beam-grid model analysis data are compared and analyzed. Through the analysis, it is found that the beam lattice model can reflect the stress characteristics of the actual bridge structure to a certain extent, and it is an effective method to analyze the wide box girder bridge, which reflects the clear concept of the beam lattice method and is convenient for calculation. It is of practical engineering significance and lays a foundation for further perfecting the program of structural analysis of box girder bridges.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.213
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