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Analysis of Tensile and Bending Resistance Factors of a Novel Internal Plug-in Self-Locking Connector for Modular Steel Structures
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摘要: 针对提出的新型内插件自锁式节点模块化节点，通过ABAQUS有限元软件建立了节点精细化有限元模型，模拟了节点的抗拉试验和抗弯试验，并与试验作对比，检验了模型的准确性。通过参数化分析研究了节点核心部位的卡扣厚度、卡槽侧壁厚度、卡槽上壁厚度对节点抗拉性能的影响，以及节点的加劲肋尺寸、自锁核心的内插件上部长度和内插件与柱的厚度比t对抗弯性能的影响规律。结果表明：卡扣的厚度是新型内插件自锁式节点抗拉性能的主控因素，保持内插件其他尺寸不变，增加卡扣厚度可以提高节点屈服荷载20.778%；内插件长度的增加可以有效改善模块柱子的应力集中；提高内插件与柱的厚度比t可以提升节点的抗弯性能，当柱厚度为8 mm时，t由1.0提升到1.25后，节点的屈服弯矩和极限荷载分别提升了1.10%和2.93%；加劲肋长度由100 mm增长至150 mm后，节点的初始刚度和极限荷载分别增长了14.26%和17.87%，说明增加加劲肋长度可以显著提高节点的抗弯能力。Abstract: A refined finite element model of the proposed novel internal plug-in self-locking connector for modular steel structures was established in ABAQUS. Tensile and bending tests of the connector were simulated， and the results were compared with experimental data to verify the model’s accuracy. Parametric studies were conducted to investigate the influence of the buckle thickness， the slot side wall thickness， and the slot upper wall thickness on the tensile performance of the connector， as well as the effects of the stiffening rib size， the length of the upper part of the inner plug in the self-locking core， and the thickness ratio （t）of the inner plug to the column on its bending performance. The results indicated that the buckle thickness was the primary controlling factor for the tensile performance of the novel connector. Keeping other dimensions of the inner plug unchanged， increasing the buckle thickness raised the yield load by 20.778%. Increasing the length of the inner plug effectively reduced stress concentration in the modular steel column. Enhancing t improved the bending performance of the connector. Specifically， when the column thickness was 8 mm， increasing t from 1.0 to 1.25 resulted in increases of 1.10% in the yield moment and 2.93% in the ultimate load of the connector. Moreover， increasing the stiffening rib length from 100 mm to 150 mm led to growth of 14.26% in the initial stiffness and 17.87% in the ultimate load， demonstrating that longer stiffening ribs significantly enhanced the connector’s bending capacity.
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