Study on the effect of symmetrical openings on the ultimate capacity of lipped channels

摘要

The paper reports the results of an investigation into the load-carrying capacity of symmetrically perforated lipped channels. 21 tests of lipped channels have been carried out to investigate the effects of the size, position and aspect ratio of rectangular holes on the ultimate compressive strength of perforated columns. A formulation is proposed to predict the ultimate load-carrying capacity of such channels. The proposed formulation is shown to predict the ultimate strength of perforated columns accurately. The size of holes is the most influential factor determining the weakening effect. The positions and the aspect ratio of the rectangular holes have only marginal effects for lipped columns.