Development of more efficient cold-formed steel channel sections in bending

Seismic performance of cold-formed steel bolted moment connections with bolting friction-slip mechanism

“…Compared to other bolt configurations, using a conventional square bolt configuration generally resulted in a higher (up to 32%) flexural capacity in the connections, especially where class 1 and 2 beam sections were used. While it was previously shown that bent flange sections can generally provide noticeably higher flexural capacity compared to their standard flat-flange counterparts[10,35], the results of this study indicate that using bent flange sections can improve the capacity of the connections by less than 10%. This is referred to two main reasons: (i) effect of bi-moment generated due to presence of bolts[8], and (ii) The effect of flange shape on the moment capacity of the connection is reduced when channel sections with a deep web are utilised.…”

Experimental Investigation of Cross-Sectional Bending Capacity of Cold-Formed Steel Channels Subject to Local-Distortional Buckling Interaction

“…In the design of the test specimens an optimisation framework was employed which was previously developed by the authors [27,28] for the purpose of generating more efficient CFS elements in bending. The proposed optimisation framework predicts the ultimate capacity of CFS elements according to EN 1993EN -1-3 (2006.…”

“…The built-up specimens were tested in four-point bending and were designed to fail dominantly by interaction of local and distortional buckling in the constant moment region. It is noted that this experimental programme is part of a wider study into the optimisation of CFS members [27,28], which is why all cross-sections in the test programme were manufactured using the same coil width and thickness, keeping the amount of material constant across the test specimen range. However, the experimental results are here presented independently of their wider context, as the results by themselves provide valuable data about the interactive buckling behaviour of CFS back-to-back channel beams.…”

Comparative calculation of optimal parameters of channel bent and bent closed profiles

“…Загибы зубчатых креплений ГЗП увеличивают толщину смятия, что может способствовать определенному росту несущей способности соединений тонкостенных элементов, работающих в основном на сдвиг [23][24][25][26][27][28][29][30]. Также они способствуют сохранению местной (локальной) устойчивости и формы сечения тонкостенных элементов до достижения предельного состояния, что позволяет рассчитывать не редуцированные сечения, а сечения нетто [31][32][33][34][35][36]. Кроме того, загибы зубчатых креплений, распределенные равномерно по всей длине швеллерного ГЗП, обеспечивают его монолитность в большей степени, чем зоны контакта с трением соединения фальцевого типа в прямоугольном профиле балки с креплениями торцов к зацепам, что позволило считать поперечное сечение балки монолитным [37][38][39][40].…”