Experimental and Numerical Analysis of Impact Strength of Concrete Slabs

Abstract

The topic of this paper is experimental and numerical analysis of the impact strength of unreinforced concrete slabs. Impact strength of concrete is significant in case of some accidental loads during exploitation. Impact strength can be determined experimentally, using Drop-weight test, Charpy test, Projectile impact test, Explosive test, etc. In this research, a numerical model for determining the impact strength of concrete slabs based on Finite element method (FEM) and high-end engineering software has been proposed. Modelling approach to this problem was applying the Explicit dynamics FEM analysis. Thereat, two different existing material models for concrete were enforced: Concrete damage plasticity model – CDP (implemented in ABAQUS/Explicit software), and the Riedel-Hiermaier-Thoma model – RHT (implemented in ANSYS Workbench software). Analysis parameters for both material models, necessary as input data, have been determined through a series of FEM analyses and validated by performed experiments, using drop-weight test. Results of the numerical analyses have been compared with the experimental ones, as well as mutually. Advantages and drawbacks of both material models are highlighted, as well as the reliability of the proposed numerical models. The proposed numerical FE models, confirmed by experiments, can be successfully used for determining impact strength of concrete slabs in further research.

The Effect of Voids on Flexural Capacity of Reinforced Concrete Slabs

“…Since many researchers modeled the reinforced concrete slabs using ABAQUS software which considers Explicit Dynamic Analysis (EDA) [18,25,29,32], same software and technique was utilized in this study. There are some behavioral problems during the modeling process of reinforced concrete members such as dynamic effects, non-linear behavior, plastic deformations and contact uncertainty [45,46]. Explicit Dynamic Analysis is a useful tool to overcome these problems as recommended in many studies.…”

“…In this study, upon the reliable results presented in the literature, ABAQUS software with Explicit Dynamic Analysis method was utilized in modeling the slabs and relevant material models, loading conditions and restraints was used. During the dynamic analysis, the loading is performed in very small steps to find the most reliable result [45,46].…”

“…In order to accurately transfer stresses, strains and cracks, it is necessary to determine the appropriate mesh shape and size depending on the slab size. For the slabs, ABAQUS recommends the standard 8-node cube or rectangular prism mesh type [46,47]. This type of FE provides smooth and correct load distribution.…”

Numerical Analysis of an Innovative Double-Strap Joint for the Splicing of Near-Surface Mounted Fiber-Reinforced Polymer Bars for Reinforced Concrete Beam Strengthening

“…It has to be mentioned that the crack development in the CDP model has been defined via the damage parameter in tension. Other research recommends that a crack opens at strains several dozen times greater than the strain at tension strength [45,46]. In this research, the value of the damage parameter, d t , of 0.80, which corresponds to a strain 50 times greater than the strain at tension strength, has been adopted as the crack opening.…”

Experimental investigation and numeric modelling of the impact performance of basalt fiber reinforced geopolymer concrete

“…This study defined GC with RHT because it was thought to better describe concrete behavior under dynamic loads [28]. The literature took the RHT model used in the analysis [29]. Data on concrete with a compressive strength of 35 MPa is defined in the material library.…”