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Research on Mechanical Properties of Inner Sleeve Connected Joint Between Modules of Fabricated Modular Steel Frame
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摘要: 对装配式模块化钢框架模块间内套筒连接节点进行有限元数值模拟,研究了内套筒与柱壁间隙、内套筒厚度以及内套筒长度对节点承载力的影响,分析了柱壁与内套筒接触力的形成机理和理论计算公式,推导了内套筒与柱壁的接触力计算公式,并与有限元数值计算结果进行对比。研究表明:内套筒与柱壁之间的预留间隙对节点承载力、应力分布以及接触力影响显著,当内套筒与柱壁无间隙时,节点区域柱壁应力分布较为均匀,随预留安装间隙增加,内套筒与柱壁形成不均匀接触应力,节点承载力下降,建议内套筒与柱壁之间的预留间隙不宜超过4 mm;当内套筒厚度大于柱壁厚度时,节点应力分布较为均匀,建议内套筒厚度宜大于柱壁厚度1~2 mm;适当增加内套筒长度有利于节点应力均匀分布,提高节点承载力,建议内套筒应外伸上层梁翼缘和下层梁翼缘各30~50 mm;柱壁与内套筒接触力理论计算式与数值计算结果的误差约为10%,这是由于算式忽略了柱子轴向弯曲变形的影响。Abstract: The finite element numerical simulation of the inner sleeve connected joint between the modules of the fabricated modular steel frame was carried out. The influences of the gap between the inner sleeve and the column wall, the thickness and the length of the inner sleeve on the bearing capacity of the joint were studied. The forming mechanism and theoretical calculation formula of the contact force between the column wall and the inner sleeve were analyzed. The formula for calculating the contact force between the inner sleeve and the column wall was derived and compared with the finite element numerical results. The research showed that the reserved gap between the inner sleeve and the column wall had a significant impact on the bearing capacity, stress distribution and contact force of the joint. When there was no gap between the inner sleeve and the column wall, the stress distribution of the column wall in the joint area was more uniform. With the increase of the reserved installation gap, the contact stress between the inner sleeve and the column wall was uneven, and the bearing capacity of the joint decreased. It is recommended that the reserved gap between the inner sleeve and the column wall should not exceed 4 mm; When the inner sleeve thickness was greater than the column wall thickness, the joint stress distribution was more uniform, it is recommended that the inner sleeve thickness should be greater than the column wall thickness of 1 to 2 mm. Appropriately increasing the length of the inner sleeve is beneficial to the uniform distribution of joint stress and improve joint bearing capacity. It is suggested that the inner sleeve should extend the upper beam flange and the lower beam flange by 30 to 50 mm respectively. The error between the theoretical calculation formula and the numerical calculation result of the contact force between the column wall and the inner sleeve was about 10%, because the influence of axial bending deformation of the column was ignored in formula.
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