Bearing design of cold formed steel bolted connections

摘要

The results of recently complet4ed bolted connection shear tests indicate that the current provisions set out in the AS/NZS 4600, AISI and Eurocode cold formed steel design standards cannot be used to accurately predict the failure mode of connections that are fabricated from thin G550 and G300 sheet steels. Furthermore, these design standards cannot be used to accurately deterine the bearing resistance of bolted specimens based on a failure criterion for predicted loads. The measured variation in bearing resistance between connection tests of thin 0.42 mm G550 sheet steels and more typical 1.0 mm and thicker sheet steels has been used to develop a gradated bearing coefficient method, that is dependent on the thickness of the connected materials and the size of the bolt(s) used in the connection. It is recomended that the gradated bearing coefficient formulation, the unreduced net section resistance, and the Eurocode design method for end pull-out be used in the design of bolted connections.