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Secondary prying of column flange in Tee-connections: Experimental investigation and mechanical modeling

机译:三通中圆柱法兰的二次撬动:实验研究和力学建模

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Column flange failure due to secondary prying effect needs to be addressed when designing Tee-connections associated with deep beams in seismic areas. This study investigates experimentally the effect of column flange thickness and the associated secondary prying on the response of double Tee moment connections. The objectives of this study are: (1) to provide insight as to whether continuity plates are necessary in columns when designing and detailing Tee-connections, (2) and to quantify the secondary prying forces and the contribution of the column flange ductility to the overall ductility of the connection. The results of a series of seven component tests on column flange/thick Tee connected back-to-back are presented and discussed providing all possible failure modes and yielding mechanisms encountered in the column flange. The component tests are subjected to both monotonic and cyclic loadings and cover the range of thin, medium, and thick column flanges connected to thick Tees. A proposed mechanical model is developed and is able to predict the strength, stiffness, ductility, and all possible failure modes of the column flange. The results show that increasing the column flange thickness decreases the secondary prying forces and increases the strength and stiffness capacities of the connection. Detailing columns without continuity plates reduces the fabrication cost and eliminates the need to weld in regions of low notch toughness. Adding the secondary prying failure mode check to the current ANSI/AISC 358-16 and Eurocode 3 part 1-8 guidelines is recommended to ensure a safe design. (C) 2018 Elsevier Ltd. All rights reserved.
机译:在设计与地震地区深梁相关的T形连接时,需要解决由于二次撬动效应而导致的柱法兰失效。这项研究通过实验研究了柱法兰厚度和相关的二次撬动对双三通弯矩连接响应的影响。这项研究的目的是:(1)提供洞察力,以在设计和详细说明T型连接时在柱子上是否需要连续板;(2)并量化次要撬力以及柱翼缘延性对柱子的贡献。连接的整体延展性。提出并讨论了一系列七个组件测试的结果,这些测试以背对背方式连接在圆柱法兰/厚T形上,提供了圆柱法兰中遇到的所有可能的失效模式和屈服机制。组件测试要承受单调和循环载荷,并且要覆盖连接到厚形三通的薄,中和厚柱法兰的范围。开发了一种建议的机械模型,该模型能够预测柱法兰的强度,刚度,延展性以及所有可能的失效模式。结果表明,增加柱翼缘的厚度会降低次级撬动力,并增加连接的强度和刚度。没有连续板的细化柱降低了制造成本,并且消除了在低缺口韧性区域中进行焊接的需要。建议将辅助撬动模式检查添加到当前的ANSI / AISC 358-16和Eurocode 3第1-8部分指南中,以确保设计安全。 (C)2018 Elsevier Ltd.保留所有权利。

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