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首页> 外文期刊>Journal of structural engineering >Ultimate Bearing Capacity of Unconfined Bolted Connections in Cold-Formed Steel Members
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Ultimate Bearing Capacity of Unconfined Bolted Connections in Cold-Formed Steel Members

机译：冷成型钢构件中无纺电螺栓连接的极限承载力

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摘要

The commentary to the North American cold-formed steel specification recommends physical testing to determine the performance of a bolted connection where the plies are not in contact with each other. This paper presents the laboratory test results of 120 such specimens with sheet thicknesses ranging from 0.55 to 3.0 mm, bolted with 10-, 12-, or 16-mm bolts. Finite-element analyses support the experimental finding that the bearing failure of an unconfined bolted connection is not associated with shear fracture but with crimpling of the critical ply. The bearing capacity varies with the square root of the bolt diameter and nonlinearly with the sheet thickness. Dimensionally consistent and continuous design equations are derived and verified against the results of the laboratory tests and finite-element analyses, the latter supplementing the former with configurations involving 8-mm bolts. The derived relationships between the bearing capacity and the sheet thickness and bolt diameter are also verified against 18 independent test results involving bolted connections through square hollow sections. The presented equation is significantly simpler but more accurate than those proposed in the literature for such connections. A resistance factor of 0.70 is recommended for use with the proposed design equations for determining the bearing capacities of unconfined bolted connections. (C) 2021 Published by American Society of Civil Engineers.
机译：北美冷成型钢结构的评论建议进行物理测试，以确定螺栓连接的性能，在那里彼此不接触的螺栓连接。本文介绍了120个这样的样品的实验室测试结果，单板厚度范围为0.55至3.0 mm，用10-，12-或16毫米螺栓螺栓。有限元分析支持实验结果，即非整合的螺栓连接的轴承失效与剪切骨折无关，而是临界折射率。承载能力随螺栓直径的平方根和单板厚度的非线性而变化。根据实验室测试和有限元分析的结果来推导和验证尺寸一致和连续的设计方程，后者用涉及8毫米螺栓的构造。轴承容量和薄层厚度和螺栓直径之间的衍生关系也验证了通过方形中空部分涉及螺栓连接的18个独立的测试结果。所呈现的等式显着更简单，但比这些连接中提出的那些更准确。建议使用电阻系数0.70，以用于确定无纺电螺栓连接的承载能力的所提出的设计方程。 （c）由美国土木工程师协会发表的2021年。

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