Abstract Moment resisting connections are widely used nowadays in different applications. The use of circular hollow sections (CHS) has increased due to its aesthetic appearance and good mechanical properties. Attention should be given to their connections under different loading conditions to achieve greater flexibility for their use. This research investigates the behavior of bolted CHS splices with solid circular end plates under pure bending moment that allows the use of CHS as long flexural members. Eight connections were tested and corresponding finite element models were constructed. The finite element models were verified against the experimental results and shown to provide acceptable agreement in terms of both ultimate moment capacity and load-displacement curves. Three modes of failure were observed where the first is pure bolt failure, the second is pure end plate yielding while the third is a combination of the two modes where end plate yielding is accompanied by bolt failure. Stiffness was also observed and was found to be greatly affected by the thickness of the end plate. Increasing the number of bolts in the end plate did not have a substantial effect on the connection stiffness but it increased its moment capacity. Contact forces between the two end plates were observed and the axis of rotation can be conservatively considered to be tangent to the CHS on its compression side. This finding can be used for end plate yielding analysis.

中文翻译：

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无加强圆端板螺栓连接空心截面的试验研究

摘要 目前，抗弯连接被广泛应用于不同的应用领域。由于其美观的外观和良好的机械性能，圆形空心型材 (CHS) 的使用有所增加。应注意其在不同负载条件下的连接，以实现更大的使用灵活性。本研究调查了带实心圆形端板的螺栓连接 CHS 接头在纯弯矩下的行为，允许将 CHS 用作长弯曲构件。测试了八个连接并构建了相应的有限元模型。有限元模型根据实验结果进行了验证，并表明在极限力矩容量和载荷-位移曲线方面都提供了可接受的一致性。观察到三种失效模式，第一种是纯螺栓失效，第二种是纯端板屈服，而第三种是两种模式的组合，其中端板屈服伴随着螺栓失效。还观察了刚度，发现刚度受端板厚度的影响很大。增加端板上的螺栓数量对连接刚度没有实质性影响，但增加了其抗弯能力。观察到两个端板之间的接触力，可以保守地认为旋转轴与其压缩侧的 CHS 相切。这一发现可用于端板屈服分析。增加端板上的螺栓数量对连接刚度没有实质性影响，但增加了其抗弯能力。观察到两个端板之间的接触力，可以保守地认为旋转轴与其压缩侧的 CHS 相切。这一发现可用于端板屈服分析。增加端板上的螺栓数量对连接刚度没有实质性影响，但增加了其抗弯能力。观察到两个端板之间的接触力，可以保守地认为旋转轴与其压缩侧的 CHS 相切。这一发现可用于端板屈服分析。