Abstract
A computational program by the tangent stiffness method has been developed for plate & shell structures. By this program, we can obtain strict equilibrium solutions even in the case of extremely large deformation, because our new calculation method considers exact spatial finite rotation of each node. The method expresses the total rotation by the composition of two coordinate transformational matrixes. In some computations, it has been evident that the application of this new method in order to renew the rotational vector us the nodal displacement causes so much improvement of the convergence.
