## An integrated system for shells with discontinuities--geometric modelling and finite element analysis |

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accuracy algorithm analysis program approximation B-spline BDS element bilinear coarse mesh computer graphics coordinate system cube curvature curve(s curved elements cylinder data types database Database Management System degrees of freedom developed displacement efficient elastic element formulation equations example FACS files finite element analysis finite element mesh global stiffness matrix groin handling hidden surface removal implementation IN-OUT input interactive meshing intersection curve intersection points linear linear elastic load lookup tables material discontinuities memory computer mesh generation schemes method midside nodes modularity multiple surface needed nonlinear number of degrees number of nodes page faulting parametric surfaces plane polygon PREPROCESSOR Pr.u problem procedure ROTATE Routine Library separability test shell discontinuities SHELL PREPROCESSOR Pr.n shell theory shown in Fig single surfaces SNAP HELP Figure solution solver SPIN spline spline-lofted surfaces stiffener structural subdivision factor Subsection techniques thickness three-dimensional transfinite mapping transformation two-dimensional vector virtual memory WUSH element ZOOM