| Steel Fiber Reinforced Concrete (SFRC) is a new kind of multiply composite material, and the short steel fibers are distributed disorderly in the plain concrete. SFRC has been widely used in civil engineering with its better properties of tensile, shear and fatigue etc. In recent years, the application of steel fiber to structural engineering has developed to improve the loading behaviors of structural members or structures on the basis of successful study of reinforcing the local behaviors of structure. The shear resistance and shear-cracking strength of steel fiber reinforced prestressed concrete beams with simply supported ends (SFPCB) are studied in this thesis.The effects of the characteristic value of steel fiber and shear-span to depth ratio on the damage states and shear resistance of SFPCB are analyzed. The shear-resistance mechanism of SFPCB is investigated and the practical formulas for evaluating the shear resistance of SFPCB are suggested. Based on the Design Code for Concrete Structures (GBJ10-89), the design methods for calculating the shear resistance of SFPCB are developed.Various factors such as the characteristic value of steel fiber and shear-span to depth ratio affecting the shear-cracking strength of SFPCB are analyzed. The theoretical model and practical formulas are proposed for evaluating the shear-cracking strength of SFPCB.The study results hi this paper can be concluded that the shear resistance and shear-cracking strength of SFPCB are much higher than that of prestressed reinforce concrete beams with simply supported ends (PRCB).
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