A material nonlinear finite element analysis is presented for analyzing reinforced concrete slabs under monotonically increasing loads. The method can be used to trace the load-deformation response through the elastic, inelastic, and ultimate load ranges.
This study includes the cracking of concrete and the non-linear stress-strain relations for concrete and reinforcement. A Elasto-hardening plastic model is adapted through the tension and compression regions. Kupfer's failure criteria is used for it's yielding criteria. Strain softening is considered and strain field formulation is introduced for it's formulation. The error which depends on the element size is reduced by introducing the fracture energy concept. That is, revising the slop of stress-strain relation in strain softening part.
Through the some numerical examples, the results are compared with those of experiments and other's analysis and good result is obtained.
