УЧЕТ ВЛИЯНИЯ ПЕРЕКРЕСТНЫХ СВЯЗЕЙ НА ДЕФОРМИРОВАНИЕ ЛОКАЛЬНО ЗАГРУЖЕННЫХ ШПАНГОУТОВ В ЗАПРЕДЕЛЬНОМ СОСТОЯНИИ

Abstract

Operation of ships is associated with the occurrence of a number of hull defects such as cambers, corrugation and dents. Therefore, for the design of ship hull structures, their technical evaluation and development of effective reinforcement schemes it is necessary to have inelastic calculation methods of hull structures. Relying on the hypothesis "on the instant disclosure of plastic hinge", this paper presents a calculation procedure for locally loaded transverse framing after formation of a cinematically variable mechanism in it, in the presence of cross connections supporting the fallen units. This method takes into account the impact of elastic-plastic base reactions, the role of which is taken by skin plate, longitudinal forces in framing and cross connections on its deformation. It has been found that increasing the rigidity of cross connections leads to reduction of load at which a cinematically variable mechanism is formed in framing. It has been noted that with large deflections, cross connection has practically no effect on deformation of the locally loaded framing, and its behavior is determined by the action of buoyancy forces from the skin plate, as well as the influence of longitudinal forces. The proposed method specifies the role of cross connections in ensuring strength of locally downloaded framing in critical state that can be used in design and modernization of ship hulls to choose the optimum size of connections.