Analysis Of Deflection On The Rectangular Stiffened Plate Under Blast Loading

With the variation of the world pattern, there is important theoretical significance and engineering value about the research on the structural response and reliability under blast loading. With the theoretical analysis combined with the numerical analysis, this paper focuses of the research and analysis of deformation of rectangular stiffened plate. And the main points are as follows:1. A motion equation of orthotropic plate under aerial explosion loading is established based on Lagrange's equation of motion, and the stiffened plate with equally distributed reinforce ribs is considered as orthotropic plate in structure, consequently, the above orthotropic plate can be transferred to the motion equation of stiffened plate.2. The author analyzes the application of the motion equation of stiffened plate. And the author come to the conclusion that the motion equation can be applied if the plate and reinforce ribs makes integral deformation, in other words, if the reinforce ribs are arranged equally and the rigidity is relative low. The solution of the equation is made by the MATLAB program.3. By means of the Nonlinear Finite Element Program, LS-DYNA, the dynamic response under explosion loading has been researched intensively by the author. The model for one-way stiffened plate and double-way stiffened plate are established and simulated separately. It turns out that in the case of the reinforced ribs with low rigidity, for both one-way stiffened plate and double-way plate, the maximum of displacement and velocity in X and Y axes are much larger than those in Z axis.4. The author looks into the effect on the integral deformation of stiffened plate of the reinforced ribs of different rigidity under the explosion loading. Research shows that the deformation of stiffened plate in most situations shows with the style of the second deformation. When the strengthen level of stiffened bars in the stiffened plate is different greatly, the deformation of the stiffened plate is inclined to whole deformation, or the local deformation.