Investigation of composite action on seismic performance of weak-axis column bending connections

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• 作者：Linfeng Lu ; Yinglu Xu ; ^{2015028003@chd.edu.cn} ; Hong Zheng
• 关键词：Steel moment frame ; Composite joints ; Weak-axis ; Cyclic loading ; Seismic performance
• 刊名：Journal of Constructional Steel Research
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：129
• 期：Complete
• 页码：286-300
• 全文大小：3748 K
• 卷排序：129

文摘

A total of ten large-scale two-sided weak-axis moment connections were tested by reversed horizontal displacements in a quasi-static cyclic regime to failure to evaluate the composite action of the developed weak-axis connections with partial shear connection. Most joints failed due to welding fracture at the conjunction of diaphragm, skin plate and beam-end flange. There was slight strength degradation in the composite joints compared to bare steel joints, confirming that the composite joints have a more stable bearing capacity even the serious damage appeared in the beam bottom flange, the web bolts and intact beam top flange of composite joints could still bear more loads. Although designed with 50% degree of shear connection, the neutral axis showed a significant upward shift under positive bending, thus leading to larger strains on the beam bottom flange. The slab slippage was small and negligible during the testing. The strain of transverse and longitudinal bars was very small and remained elastic.