Analysis of Local Mechanical Properties of Complex Joints of Concrete-filled Steel Tubular Arch Bridge
赵菊梅 ZHAO Ju-mei
（云南工程建设总承包股份有限公司，昆明 650500）
（Yunnan Engineering Construction General Contracting Co.，Ltd.，Kunming 650500，China）
摘要： 钢管混凝土是在薄壁钢管内灌注混凝土而形成的一种结构，其原理是利用钢管对其核心混凝土的套箍约束作用，使得核心混凝土处于一种三向受压状态，从而使得混凝土的抗压强度和变形能力得到提高。但由于拱肋的钢管都是直接焊接在一起的，在受力比较复杂的节点，如在拱肋拱脚位置处的力学行为比较突出，对于该处的连接，国内外的研究案例均较少，迄今尚无对该处的力学受力行为进行分析。本文以某钢管混凝土拱桥为例，截取其拱肋拱脚位置处的几何形状进行有限元分析，结果表明，最大主拉应力出现在拱肋、拱脚和系梁交接处，最大主压应力出现在拱肋与拱座连接处，在设计时应着重考虑该情况。本文希望通过此文以了解此类型结构的受力和承载能力的特点，以期对类似工程提供参考。
Abstract: Concrete filled steel tube is a structure formed by pouring concrete into the thin-walled steel tube. Its principle is to use the confinement effect of steel tube on its core concrete, so that the core concrete is in a three-way compression state, so that the compressive strength and deformation ability of concrete are improved. However, because the steel pipes of the arch rib are directly welded together, the mechanical behavior at the joint with more complex forces, such as the arch foot of the arch rib, is more prominent. There are few research cases at home and abroad for the connection there, and so far there is no analysis of the mechanical behavior there. Taking a concrete-filled steel tube arch bridge as an example, this paper conducts finite element analysis by cutting off the geometric shape of its arch rib and arch foot. The results show that the maximum principal tensile stress occurs at the junction of arch rib, arch foot and tie beam, and the maximum principal compressive stress occurs at the junction of arch rib and arch seat. This situation should be taken into account in design. This paper hopes to understand the characteristics of the bearing capacity of this type of structure and provide reference for similar projects.
关键词： 钢管混凝土；拱桥；应力集中；力学性能
Key words: concrete filled steel tube；arch bridge；stress concentration；mechanical property
中图分类号：U448.22 文献标识码：A 文章编号：1006-4311（2023）01-101-03
DOI:10.3969/j.issn.1006-4311.2023.01.033.
文章出处：赵菊梅. 钢管混凝土拱桥复杂节点局部力学性能分析[J]. 价值工程,2023,42(1):101-103.
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