Steel fibers have been used for a cement mixture to improve the material properties such as toughness, ductility, and tensile strength, and to enhance the cracking and deformation characteristics Therefore, the addition of steel fibers into a conventional reinforced concrete can enhance the structural and functional performance of safety-related concrete structures in nuclear power plants. The effects o1 steel fibers on the ultimate internal pressure and seismic resisting capacities of a prestressed concrete containment vessel are investigated. The material properties of steel fiber reinforced concrete are briefly discussed, and the tension and cyclic behaviors of structural members and walls are investigated. For a prestressed concrete containment vessel reinforced with a 1% volume hooked steel fiber, increases ol approximately 12% and 64% were estimated for the ultimate pressure capacity and maximum lateral displacement, respectively.
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