Aikaterini S. Genikomsou

Finite-Element Analysis of Reinforced Concrete Slabs with Punching Shear Reinforcement

AbstractFinite-element analyses (FEA) of reinforced concrete slab-column connections with shear reinforcement are presented and discussed. Ultimate loads and crack patterns are shown and compared to the experimental findings. The damaged plasticity model in ABAQUS, previously calibrated and validated on tested slabs without shear reinforcement, is adopted to properly simulate the behavior of slab-column connections with shear reinforcement. Four interior slab-column specimens were tested under vertical loading applied through the column. One slab specimen was without shear reinforcement, while the other three differed in the amount of the shear bolts. The objective of this paper is to propose a novel numerical modeling strategy for simulating and analyzing shear reinforced slabs with shear bolts. For that purpose, in the numerical analyses, four different approaches for modeling the shear bolt are introduced and described. Discussion and comparison on the predicted failure loads from the design codes and ...

Damaged plasticity modelling of concrete in finite element analysis of reinforced concrete slabs

Two interior slab-column connections, previously tested, are analysed using 3D nonlinear finite element methods. These slabs were tested under vertical monotonically increasing imposed displacement through the column till failure. One slab specimen was without shear reinforcement that failed in punching shear, while the other slab had punching shear reinforcement and failed in flexure. Both specimens are analysed using the concrete damaged plasticity model offered in ABAQUS. Concrete damaged plasticity model is employed with the fictitious crack model based on the fracture energy; where different failure mechanisms are predicted for tension and compression. Damage can be introduced in the model and it is defined separate in compression and tension. The model can be also equipped with viscoplastic regularization that provides additional ductility in the structure and helps to overcome convergence problems that have been created by cracking and strain localization that relies on the smeared crack approach. Parametric investigation based on the material and plasticity parameters is performed for the specimen without shear reinforcement. All numerical results are compared to the test results in terms of loaddeflection responses and crack patterns. Finite element analysis results are in good agreement with the experimental results and can give an insight into the failure mechanisms and crack developments of each slab. The predictive capability of the calibrated models confirms their ability for parametric studies examining the punching shear behaviour of reinforced concrete slabs with and without shear reinforcement.