Behavior of reverse-channel and double-reverse-channel connections to tubular columns with HSS

Abstract

This paper reports on the possible achievements on moment–rotation (M–ϕ) characteristics of reverse channel flush end-plate connections (RCC) by using HSS reverse channel under monotonic loading. It also introduces a double reverse channel connection (DRCC), where the reverse channel is split into two pieces, by leaving a gap in between, for better access to bolts. The investigations were based on parametric studies performed by using a general finite element package ABAQUS. In most cases, the use of HSS reverse channel led to noticeable increase in ultimate flexural resistance and the rotational capacity of RCC and DRCC. The key for the failure of RCC was the ratio of wall thickness of channel to the thickness of flush end-plate. When the behavior of DRCC with HSS (S690) reverse channel was compared to RCC, there was an increase in ultimate flexural resistance and rotational capacity by up to 38.7% and 53.1% respectively, without compromise to the initial stiffness. It was also noted that the clear distance between the split reverse channels had effect on the deformation of DRCC. This distance should be kept to a minimum, 20% of the beam depth, and at the same time it should be practically adequate for bolt accessibility.