Ductile and connection behaviour of thin G550 sheet steels

摘要

This paper summarises the findings of a research project into the ductility and connection behaviour of G550 sheet steels, which are manufactured by cold-reduction. Specimens ranging in base metal thickness from 0.40-0.60nnn were tested as tensile coupons. Measurements of local and uniform elongation were completed using a fine gauge length grid marked on the surface of the steel. Test results indicate that the ability of the material to undergo deformation is dependent on the direction of load within the material. In addition, the measured elongations of the G550 sheet steels do not meet the Dhalla and Winter requirements. Also included is a summary of results detailing the shear behaviour of bolted and screwed connections composed of 0.42-1.0mm G550, and 0.60-0.80mm G300 sheet steels. Various modes of failure were observed including end pull-out, bearing, tilting and net section fracture. Recommendations concerning the adequacy of current design standards with respect to the design of thin sheet steel connections are made.