School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, Inner Mongolia, China.
Sci Rep. 2023 Jan 30;13(1):1670. doi: 10.1038/s41598-023-28929-x.
With the control parameters of the wall thickness of the ball table and the thickness of the pressure plate of the ball table, four universal wrapped assembled joint models were designed for the research of stress performance via static loading test. The failure mode of the joint, the axial force-displacement curve of the web member, the equivalent stress distribution of the ball table and the pressure plate of the ball table were analyzed, and the ABQAUS finite element software was used for the analysis of parameter expansion of the specimen. The research results show that the failure modes of universally wrapped assembled joints can be divided into the buckling failure of the ball table and the strength failure of the material. The wall thickness of the ball table is the key parameter affecting the failure mode of the joints, and the thickness of the pressure plate of the ball table is the crucial parameter influencing the ultimate bearing capacity of the joints. The maximum equivalent stress of the pressure plate and the ball table at compression zone for all the joints is occurred at the side squeezed by the bolt ball, and the growth rate of the equivalent stress for the ball table at compression zone is more uniform than that at tension zone. According to the finite element analysis results, when the wall thickness of the ball table is greater than 7 mm, the thickness of the pressure plate of the ball table is greater than 16 mm, the growth rate of the ultimate bearing capacity of the joint is significantly decreased, therefore, it is recommended to use the wall thickness of 7 mm and the pressure plate thickness of 16 mm in the actual design of the project.
通过静态加载试验，控制球节点的壁厚和球节点压型钢板厚度这两个控制参数，设计了四种通用型全包裹式组合节点模型，用于研究其受力性能。分析了节点的破坏模式、腹杆的轴力-位移曲线、球节点和球节点压型钢板的等效应力分布，并采用 ABQAUS 有限元软件对试件进行参数扩展分析。研究结果表明，通用型全包裹式组合节点的破坏模式可分为球节点的屈曲破坏和材料的强度破坏。球节点的壁厚是影响节点破坏模式的关键参数，球节点压型钢板的厚度是影响节点极限承载力的关键参数。所有节点受压区球节点和压型钢板的最大等效应力均出现在被螺栓球挤压的一侧，受压区球节点等效应力的增长速率比受拉区更均匀。根据有限元分析结果，当球节点壁厚大于 7mm 时，球节点压型钢板厚度大于 16mm 时，节点极限承载力的增长率显著降低，因此建议在实际工程设计中采用 7mm 壁厚和 16mm 压型钢板厚度。
