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Mechanical properties prediction for cold-formed steel angle connection with various flange cleat thickness

机译:不同法兰夹板厚度的冷弯角钢力学性能预测

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摘要

Connection is an important element in structural steelwork construction. Eurocode does not provide adequate design information for mechanical properties prediction of top-seat flange cleat connection, especially for thin-walled cold-formed steel structures. Adopting hot-rolled design with neglecting thin-walled behaviour could lead to unsafe or uneconomic design. This research aims to provide accurate mechanical properties prediction for bolted top-seat flange cleat connection in cold-formed steel structures. The scope of work focuses on the effect of various thickness of the flange cleat to the rotational stiffness and strength behaviour of a beam-to-column connection. Experimentally verified and validated finite element modelling technique is applied in the parametric investigation. Two categories of flange cleat thickness, ranged from 2 mm to 40 mm are studied. From the developed numerical models, it is observed that Eurocode has overestimated the initial rotational stiffness prediction, calculated with component method. The over-estimation would influence the overall stiffness of structures and force distribution within the components. As a conclusion, a set of newly proposed accurate predictions for initial rotational stiffness and strength of cold-formed steel top-seat flange cleat connection, with the influence of the thickness of flange cleat is presented.
机译:连接是钢结构建筑中的重要元素。 Eurocode没有提供足够的设计信息来预测顶座法兰防滑钉连接的机械性能,特别是对于薄壁冷弯型钢结构。采用热轧设计而忽略薄壁行为可能会导致设计不安全或不经济。这项研究旨在为冷弯型钢结构中的螺栓固定式顶座法兰防滑钉连接提供准确的力学性能预测。工作范围集中在凸缘夹板的各种厚度对梁到柱连接的旋转刚度和强度行为的影响上。经实验验证和验证的有限元建模技术被应用在参数研究中。研究了两种类型的法兰夹板厚度,范围从2 mm到40 mm。从开发的数值模型可以看出,Eurocode高估了使用分量法计算的初始旋转刚度预测。高估会影响结构的整体刚度和部件内的力分布。结论是,提出了一组新提出的关于冷弯型钢顶座法兰防滑钉连接的初始旋转刚度和强度的准确预测,并受法兰防滑钉厚度的影响。

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