Study of the Effects of Type and Amount of Steel Fibers and Diameter of Projectile on Behavior of UHPSFRC

There are many structures subjected to impact and projectile penetration loading due to accidental, military and/or sabotage threats. Thus, assessment of behavior and vulnerability of materials, structural members and non-structural members is important to provide suitable materials having minimal vulnerability and better behavior. Ultra-high performance concrete reinforced by steel fibers has much better performance against these loads than ordinary concrete. The fiber specifications are the main parameters influencing the performance. This study mainly aims to find the effects of steel fiber density on impact behavior of ultra-high performance steel fiber reinforced concrete (UHPSFRC), which also considers economic aspects. Here, low velocity impact is studied by experiments, while high velocity impact is studied by numerical simulations. The simulations are verified by experimental results. Also, some tests are conducted to determine mechanical properties of concrete for the simulations. The effects of projectile diameter and specifications of steel fibers are investigated, too.