The progressive collapse potential of simple welded connections was investigated analytically. The performance of the connections was evaluated based on the requirement of UFC-4-023-03. The simple connection, which consists of a seat angle, was defined as the base model, and eight other models were derived from the base model to represent further effective details. Several solutions were developed to retrofit this kind of connection against progressive collapse in the event of removal of a column. The results showed that utilising a tendon in the connection caused considerable improvement: the proposed techniques reduced the vertical displacement of the connection by up to 50% due to the catenary action of the tendon, leading to resistance against load of the removed column. Highly effective methods that improve the quality of results even further with only a small effort are also proposed. The focus of this work was on methods that do not increase the rigidity of the connection, in order for them to be applicable in existing important structures.

中文翻译：

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简化简单的焊接连接以防止逐渐倒塌

通过分析研究了简单焊接连接的渐进塌陷潜力。连接的性能是根据UFC-4-023-03的要求进行评估的。由座椅角度组成的简单连接被定义为基本模型，并且从基本模型派生了其他八个模型以表示更多有效细节。开发了几种解决方案来改进这种连接，以防止在拆除色谱柱时逐渐塌陷。结果表明，在连接处使用钢筋束可带来显着改善：由于钢筋束的悬链作用，所提出的技术最多可将连接处的垂直位移降低50％，从而可抵抗拆除的柱的载荷。还提出了一种高效的方法，该方法只需很少的努力就可以进一步提高结果的质量。这项工作的重点是不增加连接刚性的方法，以使其适用于现有的重要结构。