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Research on Axial Compression Capacity of CHS T-Joints Reinforced with Channel Steel
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摘要: 钢管结构目前在工程上应用十分广泛,T形圆钢管节点在通过支管传递轴向压力时,常常因为节点处应力集中,发生较大变形而破坏。为提高节点承载力,采用槽钢连接的方法来加强节点并对此进行了研究。首先利用ABAQUS有限元软件模拟了3组共6个T形未加强和外加劲肋加强节点的轴向承载力试验,有限元模拟结果与试验结果吻合,验证了有限元方法的可靠性。再利用ABAQUS软件对槽钢连接节点的轴向承载力进行研究,基于不同支管与主管外径比的3组模拟,分析不同槽钢型号以及同一型号槽钢的不同长度对节点承载性能以及变形情况的影响。有限元模拟结果表明,通过槽钢连接的加强节点比未加强节点的承载力最少提高130%,最多提高252%,并且改善了主管变形情况。即:随着槽钢型号增大,槽钢节点承载能力先增加后降低,当支管与主管外径比β为0.25时,承载力提升由130%增大到252%,后又降低到196%;β为0.5时,承载力提升由133%增大到203%,后又降低到170%。随着槽钢型号增大,破坏形式也均由主管变形转变为槽钢下陷为主;当β为0.5、选用［22b槽钢时,随着槽钢长度增大,极限承载力的提高由212%逐渐降低到142%。Abstract: At present, steel tubular structures have been widely used in engineering. When a circular hollow sections (CHS) T-joint transmits the axial compression through its brace, the joint often damages due to large deformation at the joint zone. In order to improve the bearing capacity of the joint, the study of reinforcing the joint with channel steel connection was carried out. Firstly, the finite element software ABAQUS was used to simulate the axial bearing capacity test of three groups of six T-joints without and with external stiffeners. The finite element simulation results were consistent with the test results, which verified the reliability of the finite element method. Then ABAQUS software was used to study the bearing capacity of channel steel connection joints under axial compression, and three sets of simulation of different β (brace-to-chord diameter, d1/d0) were conducted to analyze the influence of different channel steel models and different lengths of the same channel steel on the bearing capacity and deformation of the joints. The finite element simulation results showed that the bearing capacity of the joints connected by channel steel was at least 130% and at most 252% higher than that of the unreinforced joints, and the deformation of the chord was improved. With the increase of the cross-section size of channel steel, the bearing capacity of channel steel joints was firstly increased and then decreased. When β was 0.25, the bearing capacity increased from 130% to 252%, and then decreased to 196%; When β was 0.5, the bearing capacity increased from 133% to 293%, and then decreased to 170%. With the increase of channel steel cross-section size, the failure mode was also changed from chord deformation to channel sag. When β was 0.5 and the 22b channel steel was selected, the ultimate bearing capacity decreased from 212% to 142% with the increase of channel steel length.
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