基于ANSYS接触分析的拱座台阶基础计算

发布时间：2018-03-03 18:08

本文选题：拱座台阶基础　切入点：有限元数值分析　出处：《公路工程》2017年03期 　论文类型：期刊论文

【摘要】：拱座基础的设计是拱桥设计中较为关键的一环,其与地基间的相互作用较为复杂,常用简化方法难以对其进行精确分析。考虑拱座基础与地基间的接触问题,采用有限元程序ANSYS14.0对某座105 m上承式钢筋混凝土拱桥的拱座台阶基础进行分析,并着重对单元类型的选择、实常数和关键选项的设置进行研究,最终建立基于ANSYS接触分析的有限元模型,并将计算结果与2种常用方法比较。计算结果表明:考虑了基底摩阻和台阶背面反力,地基应力介于传统方法和变形协调法计算值之间,结果较为合理,更能反映结构真实受力特性;抗滑移结果虽略小于传统方法,但符合规范要求;考虑接触的有限元模型不仅能得到地基应力,还能对基础的抗滑移性能、交界面接触状态作出直观的判断;可为类似结构的计算分析提供参考。
[Abstract]:The design of arch base foundation is a key link in the design of arch bridge, and the interaction between arch base and foundation is more complex, so it is difficult to analyze it accurately by common simplified methods. The contact problem between arch base and foundation is considered. The step foundation of a 105m reinforced concrete arch bridge is analyzed by finite element program ANSYS14.0, and the selection of element type, the setting of real constant and key options are studied. Finally, the finite element model based on ANSYS contact analysis is established, and the calculation results are compared with two common methods. The results show that the friction of the base and the reaction force on the back of the step are taken into account. The stress of the foundation is between the traditional method and the deformation coordination method, and the results are more reasonable and can reflect the real stress characteristics of the structure, although the anti-slip results are slightly smaller than the traditional methods, the results meet the requirements of the code. The finite element model considering contact can not only obtain the stress of foundation, but also can directly judge the anti-slip performance of foundation and the contact state of interface, which can be used as a reference for the calculation and analysis of similar structures.
【作者单位】：湖南省交通科学研究院;中南林业科技大学;
【分类号】：U448.22

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