A Design Model for Intermediate Web Stiffeners.

A rational design model for transverse web stiffeners

“…The tendency for the stiffened plate to buckle overall was first studied by Stanway et al [6,9] using a rigid-link model to quantify the overall buckling effect for plates under pure shear. Xie [5] presents an improved and extended study of the overall buckling behaviour, introducing a beam-plate model composed of a stiffener and two plate panels.…”

“…The panel bending effect was incorporated in the model by applying a lateral distributed force to the stiffener, which was taken as the lateral force acting on a straight rigid knife edge. It was established that the total stiffener moment may be expressed as [9]:…”

“…The no yield criterion has been adopted in the design methods proposed by Stanway et al [9], and by Rahal and Harding [8]. Another criterion, as adopted in the method by Rockey et al [12], is to provide a stiffener for which the plastic moment capacity is not exceeded, referred to as "plastic collapse criterion".…”

“…For stiffened plates subjected to pure shear, it has been found that the stiffener deflection may be closely represented by a half sine wave [6,9], and this shape has been assumed for stiffness design of the stiffener. This assumption is also consistent with that made in the overall buckling model (Section 2.3), from which the stiffener moment due to the overall buckling effect is derived.…”

“…For webs in pure shear, a study at Imperial College London [6,9] also demonstrated that the axial forces on the stiffener are of secondary importance, and that out-of-plane forces provide a more rational basis for design. The local panel bending effects and the significance of the tendency for stiffened plates to buckle overall were identified.…”