Strengthening CHS T-joints subjected to brace axial compression using through-bolts

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• 作者：Mina S. Iskander^a ; ^{mina.iskander@ucalgary.ca} ; Amr A. Shaat^b ; ^{amr.shaat@guc.edu.eg} ; Ezzeldin Y. Sayed-Ahmed^c ; ^{eysahmed@aucegypt.edu} ; Emam A. Soliman^d ; ^{icf57@consultant.com}
• 关键词：Circular hollow section (CHS) ; Ovalization ; Strengthening ; T-joint ; Through-bolts
• 刊名：Journal of Constructional Steel Research
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：128
• 期：Complete
• 页码：555-566
• 全文大小：2989 K
• 卷排序：128

文摘

T-joints steel CHS with large brace-to-chord diameter ratios usually fail in an outward chord deformation (ovalization) mode when subjected to brace axial compression. In this paper: A new technique is presented for increasing the joint capacity using radial through-bolts to laterally brace the chord member and delay the joint failure which has been experimentally and numerically verified. The technique showed signifcant strength enhancement even for using only one bolt. The effect of changing the number and spacing of the through-bolts on the gained strength and stiffness of the joint is investigated. Increasing the number of closely spaced bolts increased the joint capacity. An odd number of the through bolts is recommended especially for large-spaced bolts. The total distance at which bolts are placed should not be greater than the length of the chord zone affected by ovalization. A limiting value for the bolt spacing is proposed which should be less than 0.57d1, with d1 being the brace diameter. Force in through bolt for joints strengthened with one bolt is predicted to be about 16% to 19% of the joint capacity.