Experimental and Numerical Analysis on Pull-Out Resistance of Crimp-Type Stainless Steel Seam Supports
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摘要: 为提高直立锁边金属屋面支座抗风揭承载力,设计了一种扣压型不锈钢锁边支座,并通过三组拉拔试验获得了该支座不同连接部位的受力过程及破坏模式,研究了支座厚度对不同连接部位抗拉拔承载力的影响规律。研究结果表明:该扣压型不锈钢支座抗拉拔承载能力高于传统T形码支座,验证了该支座的有效性和可行性,且该扣压型支座底座自攻螺钉和弯钩扣合处连接承载力远高于弯弧段承载力,主要发生弯弧段拉直脱扣破坏。基于此建立了支座拉拔有限元模型,在验证模型可靠性的基础上,研究了支座弯弧段厚度、长度、直径和不锈钢材质等参数对支座弯弧段抗拉拔承载力的影响规律,即支座抗拉拔承载力随弯弧段厚度、长度以及不锈钢强度的增大而增大,随弯弧段直径的增大而减小。
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关键词:
- 扣压型不锈钢锁边支座 /
- 金属屋面 /
- 拉拔试验 /
- 有限元模拟 /
- 破坏模式
Abstract: To improve the wind uplift capacity of the support of standing seam metal roofing, the paper designed a crimp-type stainless steel seam support. Three group of pull-out tests were conducted to study the loading process and failure modes of different connection parts of the support, and the influence of the thickness of the support on the pull-out resistance of different connection parts was studied. The results indicated that the pull-out resistance of the support was higher than that of the traditional T-code support, which verified the effectiveness and feasibility of the support. The bearing capacity of the connection between tapping screws and the hook of the crimp-type support base was much higher than that of the curved section, thereby the main failure mode of the support was the straightening and detachment of the curved section. Afterward, the finite element model of the pull-out tests was established. On the basis of verifying the reliability of the model, the influence of parameters such as the thickness, length, diameter and steel material of the curved section on the pull-out resistance of the support was studied. It was shown that the pull-out resistance of the curved section of the support increased with the increase of the thickness, length and strength of the curved section, and decreased with the increase of the diameter of the curved section. -
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