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The need of high-performance concrete is increased in the recent years. Using steel of high grade and maximize the benefit of using these material become necessary, but these material were brittle and the failure also were brittle .So, fibers are used to enhance composite properties. The enhanced properties include tensile strength, compressive strength, elastic modulus, crack resistance, crack control, durability, fatigue life, resistance to impact and abrasion, shrinkage, expansion, thermal characteristics, and fire resistance. .There is little information in the available literature about the flexure behavior of high-performance and high-performance fiber-reinforced concrete beams with different rib geometry under partial bond The main objective of this research is to study the effect of rib geometry for steel bars and fibers types on the flexure behavior of highperformance and high-performance fiber-reinforced concrete beams under partial bond, also Pattern of cracks, final mode of failure and deformational characteristics (deflection, slip, concrete strain and slope for beams) were investigated.

BEHAVIOR OF HIGH-PERFORMANCE CONCRETE BEAMS WITH AND WITHOUT FIBER AS AFFECTED BY RIB GEOMETRY OF REINFORCEMENT BARS