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Performance evaluation of WT connections in progressive collapse

机译：渐进崩溃中WT连接的性能评估

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In conventional design, shear connections are generally assumed to resist no significant moment or tension. However, since current progressive collapse design guidelines ask engineers to design robust connections that maintain their integrity in a double-span "column removal" scenario, it is important to investigate anticipated shear connection performance under this specific type of loading. There are several types of simple shear connection used in steel structures. WT connections are one relatively common option, but there is limited information about how they would perform under these conditions. In this research, the results of a numerical study conducted to characterize the performance of WT connections under combined shear, moment, and tension are presented. The results are verified with available experimental data. Finite element models consist of a central column stub connected to adjacent beams. The WT connections are modelled as being bolted to both the column flange and beam web. The central stub column is pushed down, while the connection demand and performance are monitored at each stage. It is observed that the tension and moment that develop interact with the shear in the load transfer mechanism. Important aspects of the mode of failure are distinguished and compared with existing test data. Based on the results of this study, models are proposed for WT connections in the column removal scenario. An extensive parametric study is performed in order to investigate the effects of different design parameters, such as WT geometric properties, bolt size and type, and also connection depth. Finally, an equation, based on the connection depth, is proposed to predict the rotational ductility of this connection type when an adjacent column is removed. This study will help to shed lights on the behaviour of WT connections in the column loss event.
机译：在常规设计中，通常假定剪切连接不会产生明显的力矩或张力。但是，由于当前的渐进式塌陷设计指南要求工程师设计在双跨“柱移除”方案中保持其完整性的坚固连接，因此研究这种特殊载荷类型下预期的剪切连接性能非常重要。钢结构中使用了几种类型的简单剪力连接。 WT连接是一种相对常见的选择，但是有关在这些条件下它们的性能的信息有限。在这项研究中，给出了表征WT连接在剪切，弯矩和拉力共同作用下的性能的数值研究结果。结果得到可用的实验数据的验证。有限元模型由连接到相邻梁的中央柱桩组成。 WT连接的模型是用螺栓固定到柱法兰和梁腹板上。中央存根列被向下推，同时在每个阶段监视连接需求和性能。可以观察到，在载荷传递机构中，产生的张力和力矩与剪切力相互作用。区分故障模式的重要方面，并将其与现有测试数据进行比较。根据这项研究的结果，提出了在色谱柱拆除方案中WT连接的模型。为了研究不同设计参数（例如WT几何特性，螺栓尺寸和类型以及连接深度）的影响，进行了广泛的参数研究。最后，提出了一个基于连接深度的方程式，以预测当移除相邻列时该连接类型的旋转延展性。这项研究将有助于阐明列丢失事件中WT连接的行为。

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