Nonlinear finite element analysis of transverse shear and torsional problems in reinforced concrete shells.

摘要

Finite element formulations for reinforced concrete shell structures were improved and corroborated for transverse shear and torsional problems.;A nonlinear finite element program for shells and plates, allowing for out-of-plane shear deformation, is based on the use of layered, isoparametric finite elements. The constitutive model for concrete compression response accounts for reductions in strength and stiffness due to presence of transverse cracks. The model used for concrete in tension represents the tension stiffening effects for reinforced areas, and tension softening effects for unreinforced or slightly reinforced areas. The tension softening model uses an average stress-strain approach based on the fracture energy.;Three different series of tests an examined to verify the program: simple beans subjected to transverse shear, hollow beams subjected to torsion; and a scale model of offshore structures subjected to hydrostatic pressure.;Excellent agreements were found between predicted and observed response for all three series of tests.