THE EFFECT OF REINFORCEMENT RATIO ON STRATIFIED SLABS

This study aims to present a model suitable for analyzing reinforced concrete slabs fabricated by stratified concrete using finite element method. Stratified Concrete consist of two or more types of concrete; in particular of composite materials consisting of High Strength Concrete (HSC) (60MPa) and Normal Strength Concrete (NSC) (25MPa). A nonlinear three-dimensional finite element analysis has been used to conduct an analytical investigation on the overall behavior of reinforced concrete stratified slabs. ANSYS computer program version 15 is utilized in the analysis. The two layers of concrete were idealized by using the 8-node isoperimetric brick elements in ANSYS assuming good bond between them, while the reinforcement was modeled as link element by assuming perfect bond between the concrete and steel reinforcement. The numerical analysis includes material nonlinearity due to concrete cracking in tension, nonlinear stress strain relations of concrete in compression, crushing of concrete and yielding of steel reinforcement. The validity of the adopted models was verified through comparison with the one experimental slab, and the agreement has proven to be good.