Pul-over strength of trapezoidal steel claddings

摘要

When crest-fixed thin steel roof claddings are subjected to wind uplift, local pull-over/dimpling failures occur prematurely at their screwed connections because of the large stress concentrations in sheeting under the screw heads. When high strength steel sheeting with reduced ductility is used, a pull-over failure associated with splitting occurs whereas a local dimpling failure occurs for mild steel sheeting with greater ductility. During high wind evnts such as storms and cyclones, both of these localised failures can then lead to severe damage to the buildings and their contents. This paper presents the details of an analytical investigation of the pull-over failure associated with local dimpling that occurs in mild steel trapezoidal claddings. It includes details of the finite element model used, and a simple design formula.