内置钢管加强圆钢管约束钢筋混凝土梁柱角节点轴压性能有限元分析

发布时间：2019-01-24 19:42

【摘要】：针对圆钢管约束钢筋混凝土梁柱角节点难以满足"强节点,弱构件"的问题,提出设置节点区内置钢管的加强方案。采用ABAQUS有限元分析软件进行节点轴压试验的模拟,通过与已有试验结果对比,在验证有限元分析方法合理可靠的基础上,建立108个加强节点模型进行轴压性能研究。分析结果表明:以内置钢管加强的圆钢管约束钢筋混凝土梁柱角节点,其轴压承载力接近钢管约束钢筋混凝土短柱,容易实现"强节点,弱杆件"的设计原则;加强节点的轴压承载力随混凝土强度等级、节点区内置钢管壁厚、梁高的增加而增加,随内置钢管开槽高度的增加而减小。根据分析结果提出适用于钢管径厚比不小于50的加强节点轴压承载力计算式,并另建立6个计算模型进行适用性检验,结果表明该计算式与检验模型计算结果吻合较好。
[Abstract]:Aiming at the problem that it is difficult to satisfy the problem of "strong joint and weak member" in circular steel tube restrained reinforced concrete (RC) angle joint, this paper puts forward a scheme of strengthening the inner steel pipe in the joint zone. The ABAQUS finite element analysis software is used to simulate the axial compression test of the joints. By comparing with the existing test results, and on the basis of verifying the rationality and reliability of the finite element analysis method, 108 strengthened joint models are established to study the axial compression performance. The results show that the axial bearing capacity of circular steel tube reinforced concrete Liang Zhu joint reinforced with inner steel tube is close to that of steel tube confined reinforced concrete short column, and the design principle of "strong joint and weak member" is easy to be realized. The axial bearing capacity of the strengthened joints increases with the concrete strength grade, the wall thickness of the inner steel pipe in the joint zone, the height of the beam, and decreases with the increase of the slotted height of the inner steel pipe. Based on the analysis results, a formula for calculating axial compression capacity of steel pipe reinforced joints with a diameter to thickness ratio of not less than 50 is proposed, and six other calculation models are established to test their applicability. The results show that the formula is in good agreement with the calculation results of the test model.
【作者单位】：华南理工大学亚热带建筑科学国家重点实验室;华南理工大学建筑设计研究院;
【基金】：华南理工大学亚热带国家重点实验室开放课题(2014KB29,2015ZB30)
【分类号】：TU398.9

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