大跨度分体式钢箱梁斜拉桥极限承载力分析

发布时间：2018-01-12 16:35

本文关键词：大跨度分体式钢箱梁斜拉桥极限承载力分析　出处：《合肥工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：主跨806m的芜湖长江公路二桥具有分体式钢箱梁、四索面斜拉桥的结构特点,这使得每一幅单梁可以由两幅索面悬挂,独立性较好,通过一定间距的箱形横梁连接共同受力。本文主要研究芜湖长江公路二桥的极限承载能力,并对其进行参数分析,旨在搞清分体式钢箱梁斜拉桥的极限承载力的机理,从整体上把握桥梁的极限承载力行为和安全储备,不仅可为同类型桥梁的设计提供参考,也可为芜湖长江公路二桥健康监测系统设计提供依据。论文的主要研究工作及其结论包括：1.建立了芜湖长江公路二桥的双主梁有限元模型,进行了弹性稳定的特征值屈曲分析,分析了横梁刚度对分体式钢箱梁斜拉桥整体弹性稳定性的影响。计算结果表明：一阶失稳模态为面内失稳,增大横梁刚度会提高结构整体稳定性。2.考虑几何和材料双重非线性,计算了芜湖长江公路二桥的极限承载力,并研究了结构非线性因素对大跨度分体式钢箱梁斜拉桥极限承载力的影响,分析了破坏路径。结果显示：在全桥均布活载作用下,跨中斜拉索的失效导致了全桥极限承载力的丧失。因此斜拉桥的极限承载力是由斜拉索的材料非线性控制的。3.重点分析了各种参数对大跨度分体式钢箱梁斜拉桥极限承载力的影响。比较了漂浮体系、半漂浮体系和刚构体系三种不同结构体系下斜拉桥的整体受力和极限承载力,分别对比了不同荷载分布方式对结构极限承载力的影响,分析了单幅均布活荷载下索力的横向分布情况,详细讨论了结构设计参数对极限承载力的影响。结果表明：半漂浮体系与全漂浮体系的计算结果非常接近,刚构体系极限承载能力相对较好。荷载的分布方式对结构极限承载力影响明显,在极限承载力状态下,关键断面处四根拉索应力增量基本保持为线性的。因此,四幅索面在极限荷载作用下索力的横向分配是均匀的,分体式箱梁仍保持良好的共同工作状态。在非对称荷载作用下,横梁间距对结构的极限承载力有重要影响。改变辅助墩到边墩的距离,仅对辅助墩附近结构的内力和变形有明显影响,对结构极限承载力影响不明显。
[Abstract]:806m main span of Wuhu Changjiang River Highway Bridge with split type steel box girder, four cable structure characteristics of cable-stayed bridge, which makes every single beam by two cable suspension, a good independence, the common force through the box beam spacing connection. This paper mainly studies the ultimate bearing capacity of Wuhu Yangtze River Highway Bridge, and carries on the parameter analysis, aims to find out the mechanism of ultimate split type cable-stayed bridge with steel box girder bearing capacity, bearing capacity and safety behavior limit grasp bridge as a whole, can not only provide a reference design for the same type of bridge, also can provide the basis for the design of Wuhu Changjiang Highway Bridge health monitoring system research. The work and conclusions of this thesis include: 1. established a double beam finite element model of Wuhu Yangtze River Highway Bridge, the characteristics of elastic stable value buckling analysis, analyzed the stiffness of beam split type Affect the overall elastic stability of steel box girder cable-stayed bridge. The calculation results show that the first order buckling mode for in-plane buckling, increasing the stiffness of beams will improve the overall stability of the structure of.2. considering the geometry and material nonlinearity, the ultimate bearing capacity of Wuhu Yangtze River Highway Bridge are calculated, and the influence of structural nonlinear factors on large span points the ultimate bearing capacity of separated steel box girder cable-stayed bridge, analyzes the failure path. The results showed that: in the full bridge uniform live load, span of cable failure leads to the whole bridge ultimate bearing capacity loss. Therefore the limit of the cable-stayed bridge bearing capacity is controlled by the material nonlinear cable.3. key analysis the influence of various parameters on the large span of Separated Steel Box Girders of ultimate bearing capacity of cable-stayed bridge. The floating system, semi floating system and rigid system of three different structural system of cable-stayed bridge and the stress The ultimate bearing capacity, respectively. Effects of different load patterns on the structural ultimate capacity comparison, analysis of transverse distribution of single uniform live load force, the influence of design parameters on the ultimate bearing capacity are discussed in detail. The results show that the calculation results are very close to the semi floating system and the floating system, just the ultimate bearing capacity of structure is relatively good. The distribution of loads on the structure bearing capacity significantly, in the state of ultimate bearing capacity, the key section of four cables stress increment is essentially linear. Therefore, four pieces of cable under the action of the ultimate load of cable force transverse distribution is uniform, split the box girder remained together in good working condition. Under non symmetrical load, transverse spacing has important influence on the ultimate bearing capacity of structure. The change of auxiliary pier pier to the distance, only the Auxiliary Pier nearby The internal force and deformation of the structure have obvious influence, and the influence on the ultimate bearing capacity of the structure is not obvious.

【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U441;U448.27

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