Buckling of compression-loaded multispan stiffened panel upon failure of joints between panel and supports

In research of stability of stiffened panels it is usually supposed that joints between panel and with supports do not fail at buckling. However, these joints can turn out to be insufficiently strong, and buckling of the panel can be accompanied with their destruction in limited areas. Thus the separated fragments become buckled (with finite amplitude of out-of-plane deflection) and the work for destructing the joints is dispersed. es include buckling of a compression-loaded multispan stiffened panel upon destruction of attachment to transverse and/or longitudinal supports. The method proposed to solve this problem is based on the energy approach which takes into account, firstly, work for possible destruction of the joints and secondly, an overall energy balance during transition of some components, from initial in-plane compression to compression+bending with finite out-of-plane displacements in the postbuckling stage. Sizes of the area of destruction of joints are determined by minimizing the total energy of the system.