| Title |
Shell Finite Element of Reinforced Concrete for Internal Pressure Analysis of Nuclear Containment Building |
| Keywords |
nuclear containment building;shell finite element;reinforced concrete;cracking criteria;ultimate pressure capacity;NUCAS;원전 격납건물;쉘 유한요소;철근콘크리트;균열발생기준;극한내압능력 |
| Abstract |
A 9-node degenerated shell finite element(FE), which has been developed for assessment of ultimate pressure capacity and nonlinear analysis for nuclear containment building is described in this paper. Reissner-Midnlin(RM) assumptions are adopted to develop the shell FE so that transverse shear deformation effects is considered. Material model for concrete prior to cracking is constructed based on the equivalent stress-equivalent strain relationship. Tension stiffening model, shear transfer mechanism and compressive strength reduction model are used to model the material behavior of concrete after cracking. Niwa and Aoyagi-Yamada failure criteria have been adapted to find initial cracking point in compression-tension and tension-tension region, respectively. Finally, the performance of the developed program is tested and demonstrated with several examples. From the numerical tests, the present results show a good agreement with experimental data or other numerical results. |