In this tutorial, the Simulation of rigid body impact to the interior voided RC slab in Abaqus has been investigated. The RC voided slab is modeled as a three-dimensional solid part. The steel bars are modeled as a three-dimensional wire part. The rigid impactor is modeled as a three-dimensional shell part. You can see a figure of the assembled parts below
In recent modern buildings, voided slabs have been extensively employed because of the high reduction in their self-weight up to 35%. Limited studies have been conducted on such slabs and no significant drop in the flexural strength was reported due to introducing voids. The Concrete Damaged Plasticity Model (CDPM) was used for defining the two main mechanisms of concrete failure: tensile cracking and compressive crushing. The CDPM was fed stress-strain values in the compression and tension, relying on the test compressive strength of concrete. The CDP model is not appropriate for the impact especially high-velocity impact and instead of that, the Johnson-Holmquist model is so suitable. The JH2 model can consider concrete failure and damage during the impact and it can be used through code or input modifications.
The dynamic explicit step is selected for this analysis. The general contact capability with contact property is used to consider all contacts in the contact domain. The steel reinforcements are embedded inside the concrete slab. The fixed boundary condition is assigned to two sides of the slab and the initial velocity is assigned to the rigid impactor. The mesh should be fine to obtain correct results
After the simulation, all results such as stress, strain, failure, damage, penetration of the impactor, and… are available. you can see some figures for the results below
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