Bearing failure in bolted sleeve connections with circular hollow sections under compression

Abstract This article analyzes sleeve connections between circular hollow sections. This type of connection is composed of two tubes connected by bolts to an inner tube with a smaller diameter, and explores the efficiency, aesthetics and resistance of hollow sections subjected to tension and compression. In previous researches, sleeve connections with aligned and crossed bolt dispositions and under axial tension were studied. Herein, the behavior of sleeve connections with aligned bolts and under compression was analyzed. A model to represent the connection using the finite element method was developed, which allowed a numerical analysis with geometric property variations. In the numerical/parametric results, bearing failure was observed in all cases, either in the outer or inner tube. Limiting the number of bolts to 6 and considering that connections have a lower outer thickness than the inner tube, a formulation was proposed to determine the ultimate bearing capacity of sleeve connections under compression and with bearing failure.摘要 本文针对圆形中空截面（circular hollow sections）之间的套筒连接（sleeve connections）展开分析。该类连接由两根管材通过螺栓固定于一根直径更小的内管组成，本文同时研究了受拉与受压工况下中空截面的使用效能、美学特性与承载抗力。过往研究中，学者们已针对螺栓对齐布置、交叉布置且承受轴向受拉的套筒连接展开了相关探究。本文则针对螺栓对齐布置且承受轴向受压的套筒连接的受力性能展开了分析。本文采用有限元法（Finite Element Method）构建了用于表征该连接的数值模型，借此可开展考虑几何参数变化的数值分析。数值与参数化分析结果表明，所有工况下均出现了承压破坏现象，破坏位置可发生于外管或内管。在将螺栓数量限定为6根，且考虑连接中外管壁厚小于内管壁厚的前提下，本文提出了一种可用于计算受压且发生承压破坏的套筒连接极限承载能力的计算公式。