超宽梁拱组合桥梁计算分析

发布时间：2018-05-31 23:39

本文选题：V型拱桥 + 宽箱梁　；参考：《西南交通大学》2014年硕士论文

【摘要】：青白江大桥是一座跨径布置为40m+100m+40m的V型外倾式拱桥,其桥面宽度达到54m。复杂的空间异型结构体系和超宽桥面构造加大桥梁结构受力分析的难度。仅通过以梁单元建立有限元模型进行计算,结果精度不足、不能很好的体现横向变形与内力分布；而使用实体有限元进行全桥建模分析计算虽然能满足计算精度要求但工作量过大,且耗时长。因此,考虑到桥梁主梁的大宽跨比,应该采用梁格法进行计算,这样计算量相对较小而且计算精度相对较高。从桥梁的拱圈位置和吊杆的位置分布来判断,其横向受力分析十分重要,关系到体系的平衡。因此本文认为在建立有限元计算模型对桥梁进行分析时应当充分考虑主梁的横向刚度对桥梁结构体系造成的影响。而常用的梁格法在宽箱梁的应用上并不十分完善,未能考虑到横坡、宽翼缘等因素造成的影响,所以应对梁格法在宽箱梁的应用进行改进,以提高桥梁的计算精度。本文一共分五章。第一章简要介绍了梁拱组合桥梁的发展历程及设计计算方法；第二章详细阐述了剪力-柔性梁格法理论；第三章利用有限元软件ANSYS与MIDAS/CIVIL作为计算工具建立了以青白江大桥主跨主梁为研究对象的实体有限元模型和梁格法模型。通过对计算结果的对比分析,对一般的梁格划分和刚度取值方法进行改进。然后建立改进后的梁格法模型,与改进前的模型进行结果对比；第四章运用改进前和改进后的梁格法对青白江大桥建立了整体有限元模型,并对成桥的静力和动力等部分结果进行了对比分析；最后本文介绍以刚性连续梁法、刚性吊杆法和影响矩阵目标函数优化法对拱桥的吊杆合理张拉力进行了探讨计算。本文在改善宽箱梁的计算方法和对合理张拉力计算方法的研究,为同类型大桥的设计及优化提供了一定的参考依据。
[Abstract]:Qingbai River Bridge is a V-type extroverted arch bridge with a span of 40m, 100m and 40m, and its deck width reaches 54m. The complicated spatial irregular structure system and the super wide deck structure make it more difficult to analyze the force of the bridge structure. Only by establishing finite element model of beam element, the accuracy of the result is insufficient, and the transverse deformation and internal force distribution can not be reflected well. The whole bridge modeling and calculation by using solid finite element method can meet the requirement of calculation precision, but the workload is too large and the time consuming is long. Therefore, in view of the large width-span ratio of the main girder of the bridge, the beam lattice method should be used to calculate, so the calculation cost is relatively small and the calculation accuracy is relatively high. Judging from the position of the arch ring and the position of the suspender, the lateral force analysis is very important, which is related to the balance of the system. Therefore, the influence of the transverse stiffness of the main beam on the bridge structure system should be fully considered when the finite element calculation model is established to analyze the bridge. However, the commonly used beam lattice method is not perfect in the application of wide box girder, and has not taken into account the influence of transverse slope and wide flange, so the application of beam lattice method in wide box girder should be improved in order to improve the accuracy of bridge calculation. This paper is divided into five chapters. The first chapter briefly introduces the development course and the design calculation method of the beam-arch composite bridge, the second chapter elaborates the theory of shear-flexible beam method in detail. In the third chapter, the solid finite element model and the beam method model are established by using the finite element software ANSYS and MIDAS/CIVIL as the calculation tools, taking the main girder of Qingbai River Bridge as the research object. Through the comparison and analysis of the calculation results, the general method of beam grid division and stiffness selection is improved. Then the improved beam method model is established, and the results are compared with the improved model. In the fourth chapter, the whole finite element model of Qingbai River Bridge is established by using the improved beam method and the improved beam lattice method. The static and dynamic results of the bridge are compared and analyzed. Finally, the rational tension of arch bridge is calculated by rigid continuous beam method, rigid suspender method and objective function optimization method of influence matrix. In this paper, the calculation method of wide box girder and the calculation method of reasonable tension force are improved, which provides a certain reference for the design and optimization of the bridge of the same type.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442

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