This paper presents the results of repeated impact drop-weight test with gradually increasing drop-height on prestressed concrete (PC) beams reinforced with sho1i steel-fibers. In addition, the concrete beam with a buffer layer made of a cement-based material with micro-fibers has…
This paper presents the results of repeated impact drop-weight test with gradually increasing drop-height on prestressed concrete (PC) beams reinforced with sho1i steel-fibers. In addition, the concrete beam with a buffer layer made of a cement-based material with micro-fibers has been developed for improv- ing the impact resistance. Not only global response (drop-height and load-displacement relations) but also the size of local damaged zone in concrete (cracks, spalling of concrete portions and so forth) was investigated. The prestressing and reinforcing with short steel-fibers impa1i the impact resistance to concrete beams. This paper also reports that the relationship between the steel-fiber content and the amount of prestress is important to improve the impact resistance of concrete members.