梁—拱组合桥拱脚钢混结合区域力学行为研究

发布时间：2018-06-09 13:20

本文选题：传力机理 + 部分填充混凝土　；参考：《西南交通大学》2015年硕士论文

【摘要】：梁-拱组合桥拱脚结合区域的力学行为对全桥的结构受力和安全性有着重要的影响,因此,对拱脚结合段构造进行局部受力分析必须得到足够的重视。论文以30m+40m+30m梁-拱组合桥为工程依托,利用ANSYS软件建立拱脚钢混结合段局部有限元模型,研究结合段的传力机理、各构件的应力分布形式,分析钢箱拱肋节段部分填充混凝土的作用机理及效果,探究结合段在受力破坏全过程仿真中的非线性行为。在运营使用阶段,结合段各构件应力水平明显低于材料强度允许值,且均表现为明显的局部受力行为,局部应力集中或高应力区域呈细长带状分布,各构件利用率不高,局部受力合理性差。填充混凝土能有效的卸载钢箱拱肋部分内力,并显著改善结合段各构件的应力分布,降低构件应力水平。运用ANSYS软件模拟钢和混凝土的材料非线性特性,并对局部有限元模型进行逐级加载,模拟结构从弹性阶段到受力破坏的全过程非线性行为。结合段各构件在加载过程中均表现为局部破坏(混凝土材料压碎、钢屈服)。局部模型的荷载-位移曲线平滑无明显突变,结构的宏观力学响应比较合理并具有一定的延性。
[Abstract]:The mechanical behavior of the arch joint area of the beam-arch composite bridge has an important influence on the structural stress and safety of the whole bridge. Therefore, the local stress analysis of the arch joint section must be paid enough attention to. Based on 30m 40m 30m beam-arch composite bridge, the local finite element model of steel-concrete joint section with arch foot is established by ANSYS software, and the mechanism of force transfer and the stress distribution of each member are studied. This paper analyzes the mechanism and effect of partially filled concrete in steel box arch rib segment, and probes into the nonlinear behavior of the combined section in the simulation of the whole process of mechanical failure. In the operation stage, the stress level of each member in the combination section is obviously lower than the allowable value of the strength of the material, and all of them show obvious local stress behavior, the local stress concentration or the high stress area is a slender band distribution, and the utilization ratio of each component is not high. The rationality of local force is poor. The filling concrete can effectively unload the internal force of the arch rib of steel box, improve the stress distribution of each member in the joint section, and reduce the stress level of the member. The material nonlinear behavior of steel and concrete is simulated by ANSYS software, and the local finite element model is loaded step by step to simulate the nonlinear behavior of the structure from elastic stage to the whole process of failure. In the loading process of each member in the joint section, the concrete material is crushed and the steel yield. The load-displacement curve of the local model is smooth and has no obvious abrupt change. The macroscopic mechanical response of the structure is reasonable and has certain ductility.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441

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