自锁式协同受力模块梁静力承载性能研究
Study on the Bearing Capacity of an Innovative Self-Locking Co-working Modular Beam
针对目前模块建筑钢结构中模块单元梁之间无法协同受力的情况,本文提出一种无需破坏围护结构的自锁式梁间侧向连接节点,围绕采用该节点形式连接的模块梁,采用数值模拟方法对构件静力承载性能进行研究,探究构件的传力机理和破坏模式,分析了连接数目、锁扣数目、梁截面高度与跨度比值、连接位置这四个关键参数的影响规律。结果表明:自锁式协同受力模块梁具有较好的承载性能,包括较高的极限承载力和较强的变形能力,破坏模式主要为模块梁及上、下连接件的材料接近强度极限,从而失去承载能力。相较于现有模块梁,自锁式协同受力模块梁的极限承载能力有较大幅度提升,梁间协同工作效果明显。构件极限承载力随着梁间侧向连接数目的增加而提升,但增加幅度与加载方式和连接具体数目有关。在端弯矩荷载作用下,当模块单元梁截面高度与跨度的比值较小时,自锁式梁间连接对构件承载力的提升作用发挥更加充分,而在竖向均布荷载作用下,该比值对构件承载力的影响较小。梁间侧向连接位于左右2/7梁跨区域时,模块单元梁之间的协同受力效果最显著。
In view of the inability of cooperative work between modular beams in the current modular steel building, a self-locking lateral connection between beams is proposed without destroying the envelope structure. The static load performance of the co-working modular beam is studied by numerical simulation method, and the force transmission mechanism and failure mode of the beam are explored as well. The influence of four key parameters, including the number of connections, the number of locks, the ratio of beam section height to span, and the connection position, is analyzed. The results show that the self-locking co-working modular beam has a relatively good bearing capacity, including high ultimate bearing capacity and strong deformation capacity. The main failure mode is that the modular beam and the upper and lower connectors are close to the strength limit, thus losing the bearing capacity. Compared with the existing modular beams, the ultimate bearing capacity of the self-locking modular beams is greatly improved, and the collaborative working effect between the beams is obvious. The ultimate bearing capacity of the member increases with the increase of the number of lateral connections between beams, but the increasing range is related to the loading method and the specific number of connections. Under end moment load, when the ratio of section height to span of modular beam is small, the connection between self-locking beam plays a more significant role in enhancing the bearing capacity of the member, but under vertical uniform load, the ratio has a smaller effect. When the lateral connection between the beams is located in the left and right 2/7 beam span, the collaborative effect between modular beams is the most significant.
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国家自然科学基金(52208175)
国家自然科学基金(52578230)
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