Plastic mechanism analysis of structural performances for stiffeners on bottom longitudinal web girders during a shoal grounding accident

摘要: Abstract A theoretical model is introduced in this paper for structural performance of stiffeners on double-bottom longitudinal girders a shoal grounding accident. Major emphasis placed establishing the characteristic deformation mechanism and identifying major energy dissipation patterns. Numerical simulations using LS-DYNA nonlinear finite-element program were carried out to examine thoroughly progressive process during sliding deformation. Stiffener deformations observed fall into two categories: fully contacted with indenter, subjected indirect due transfer from attached girders. Grounding substantially influenced by that plating, therefore review existing models (i.e. Simonsen 1997, Midtun 2006 Hong 2008) was included. Hong's bottom found not capable representing effects stiffeners, new thus developed. Based observation numerical analytical girder model, kinematically admissible built. Using methods plastic analysis, simplified expressions girder-attached both noncontacted, formulated, equations resistance subsequently obtained. The agree favorably results capture significant characteristics problem: varies little indentation contacting independent slope angle indirectly deformed stiffeners. proposed helps predict analytically reasonable accuracy.