Modeling Parameters in Punching Shear Finite Element Analysis of Concrete Slabs

摘要

Nonlinear finite element analysis (FEA), when properly calibrated based on experimental results of reinforced concrete slabs, can be useful to perform parametric studies for the investigation of structural behavior and for the development of future design code provisions. In this paper, a study is presented on how certain modeling decisions influence the FEA results for punching shear analyses of reinforced concrete slabs. The ''Concrete Damaged Plasticity" model which is offered in the commercial FEA program ABAQUS is considered to simulate the concrete slabs, where the calibration was conducted based on already tested slab-column connections. The calibrated model is further investigated to discuss the impact of numerous modeling parameters including the boundary and loading conditions, finite element mesh type and size, and the constitutive modeling of concrete. Selected parametric studies are presented and recommendations for each of the investigated parameters are provided to better understand the punching shear behavior of reinforced concrete slabs. The results from the analysis of tested slabs and the subsequent parametric studies using the calibrated model show that that the FEA can be used to predict the punching shear strength, deformation capacity and crack pattern of the slabs.