mechanics. The problem involves an axially symmetric spherical shell stiffened with a foot
ring and is approached (1) by using the axisymmetric formulation of linear elasticity theory
and (2) by using a dimensionally reduced shell-ring model. In the first approach the problem
is solved with a fully automatic hp-adaptive finite element solver whereas the classical h-
version of the finite element method is used in the second approach. We study the …