ABSTRACT
The collapse of such thin-walled members is always associated with buckling phenomena, which arises due to action of (i) compressive normal stresses in the longitudinal direction, (ii) shear stresses and (iii) compressive normal stresses in the transverse direction, or due to a combination of these types. The localized buckling phenomenon arising from compressive normal stresses acting in the member transverse direction is less well understood. The failure of I-section steel girders under concentrated loads is mostly known as “patch loading collapse”. This failure is due to the simultaneous occurrence of localized buckling (instability) and yield line mechanism (plasticity) in the web of the beam.
