Otrzymywanie macierzy elementu płyty zginanej dla modelu mieszanego metodą ortogonalizacji

The method of orthogonalization [16, 17] is used to derive a general expression for the element matrix used in bending problems of thin isotropic plates solved by means of the mixed finite element model. The plate is divided into elements. The method is illustrated by the example of a triangular with constant moments (Herrmann [5], Hellan [6]) and of a rectangular element with linearly variable moments mx, tny and constant mxy (Backlund [7]). Short review of various elements is presented.