The main purpose of this paper is to investigate the nonlinear behaviors
of reinforced concrete roof-type circular cylindrical shells stiffened with
a rib, both theoretically and experimentally.
In this analysis, two different types of supporting condition are considered.
One is a four-point simply supported-type shell and the other is a four-point
supported cantilever-type shell. A stiffening rib on the overall shell
structures is investigated. The experimental study is conducted on reinforced
micro-concrete specimens. Circulas cylindrical small scale models with different
boundary stiffnesses and different point-supporting condition are used. These
specimens are loaded by uniform vertical load to failure.
The theoretical study is conducted using material and geometrical nonlinear
finite element analysis including concrete cracking and tension stiffening
effects. Degenerate thick shell elements employing a layered discretization
through the thickness are adopted.
The critical loads and cracking patterns are obtained by FEM calculations and
those results are compared to those in the experimantal study. The interactions
between the shell and the stiffening members, and the effects of both stiffening
members and point-supporting conditions on the overall behaviors of the structures
are obtained.