Experimental behaviour of reverse channel connection component under bolt tension at elevated temperatures

This paper reports the results of a series of experiments to quantify the load-deflection behaviour of the reverse channel component, used in reverse channel connection between steel beam to tubular column, under bolt tension at elevated temperatures.A total of 9 tests were performed to investigate the effects of different reverse channel widths (150 and 230 mm), thicknesses (5.5 and 7.5 mm), the number of bolts (one and two rows) and temperature levels (20, 550, 750 & deg;C) on the failure modes and load-deflection relationships. The results indicate that failure modes can change at elevated temperatures due to different rates of reduction in strength of the different connection components. Three failure modes were observed, including formation of yield lines around individual bolt rows, formation of yield lines along the reverse channel web length and bolt fracture. There was also some development of membrane action. The yield line results can be used to give a safe estimate of the load carrying capacity of the component. © 2012 Taylor & Francis Group, London.