New Continous Finite Element Methods For Reissner-Mindlin Plate Problem

On triangle or quadrilateral meshes,two new finite element methods are proposed for solving the Reissner-Mindlin plate problem either by augmenting the Galerkin formulation or modifying the plate-thickness.In these methods,the transverse displacement is approx-imated by conforming(bi)linear macroelements or(bi)quadratic elements,and the rotation by conforming(bi)linear elements.The shear stress can be locally computed from transverse displacement and rotation.Uniform in plate thickness,optimal error bounds are obtained for the transverse displacement,rotation,and shear stress in their natural norms.Numerical results are presented to illustrate the correctness and validity of the theory.