Protection of important reinforced concrete structures like nuclear structures against missile impact either environmentally generated or as a terrorist activity, is one of the topics of discussion in recent days, specifically after the incident of 9/11 in USA. Development of computational capability for assessment of structural integrity against missile impact is under progress around the globe and needs strong cutting edge technological competency as the simulation is highly complex in nature. IRIS-2012 is a round robin exercise to simulate or predict the response of missile and target numerically based on small scale experiments. This includes modeling and nonlinear analysis of a concrete slab, and simulation of missile impact and response of the structure. An attempt has been made in this paper to simulate the flexure test (impact by a soft/deformable missile) and punching test (impact by a hard/rigid missile) on a reinforced concrete slab. ABAQUS/Explicit Code is used for simulation. The analysis is technologically challenging and all the behavioral aspects of the problem cannot be simulated directly because of software limitations. To simulate impact of soft missile, multiple stress-strain property based on different strain rates was successfully introduced and a methodology was developed based on impact mechanics and wave propagation in solid media to simulate local responses of target due to impact of hard missile, such as spalling, scabbing, penetration and perforation.
展开▼
