Title: 3-D finite element analysis of punching shear of RC flat slabs using ABAQUS
Author(s): Aikaterini S. Genikomsou, Maria A. Polak
Publication: Symposium Paper
Appears on pages(s): 101-116
Keywords: Concrete damaged plasticity model, finite element analysis, punching shear, reinforced concrete slabs, shear bolts.
Punching shear failure of reinforced concrete slabs has been examined by many researchers through laboratory experiments. However, the existing punching shear testing database cannot address all aspects of the punching shear stress transfer mechanism. Advanced 3-D finite element analysis (FEA) can be used to supplement the existing testing background and for parametric investigations. In this way, different aspects of punching shear failure may be explored in detail, to enable understanding of the phenomena that control the response and to support drafting design code requirements. This paper describes research on calibrating constitutive and finite element models in ABAQUS to capture punching shear behavior of concrete slabs. The coupled damaged-plasticity model is used for modeling the concrete. Two interior reinforced concrete slab-column connections previously tested under static loading are presented: one slab is without shear reinforcement (SB1) and the other slab is with shear bolts (SB4). The developed formulation is calibrated using the results for specimen SB1, where the tension stiffening response, the damage parameters and the support conditions are examined. Then, the adopted FEA and concrete model are used for the analysis of slab SB4, which was retrofitted with shear bolts. Finally, both test and numerical results are compared to the ACI 318-14 provisions.