CONCRETE RAILROAD TIES REINFORCED WITH STEEL FIBERS September 25-27,2000

摘要

Prestressed concrete railroad ties were manufactured both without steel fibers and with a fiber content of 60 kg/m~3 (101.4 lb/yd~3 - 0.76 % by volume), and three different initial prestressing forces. Static tests showed that steel fibers increase the first crack and ultimate bending moments, increase significantly the slip force of the prestressing tendons, reduce crack width, add higher ductility to the ties and decrease the stress in the prestressing tendons. Under cyclic loading the fibers increase significantly the strength, decreasing the stress in the prestressing tendons by about 50 %.