Numerical simulation of pre-stressed concrete slab subjected to moderate velocity impact loading

This paper presents an efficient numerical analysis procedure to simulate failure analysis of a pre-stressed concrete slab subjected to the hard impact using LS-DYNA commercial software. In this study, the moderate velocity (60 m/s-300m/s) used in the corresponding tests, is chosen in order to assess the punching resistant capacity of the slabs. Material nonlinearity is employed to consider failure and damage. The structural dynamic behavior of the materials is considered by taking into account the strain-rate effect, and damping effects are also investigated. An efficient method on the simplified modeling of pre-stressed concrete, namely the “Spotweld” method, is proposed, which allows introducing the pre-stressing force directly into the pre-stressing bars. To illustrate the accuracy of the proposed numerical analysis procedure, two different impact tests are used for the verification of the numerical modeling. The effects of modeling parameters are examined by several parametric analyses. It is shown that proposed modeling may be effectively used to investigate the structural behavior of pre-stressed concrete structures subjected to hard missile impact.