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The need of high-performance concrete is increased in the recent years. Also using steel of high grade and maximize the benefit of using these material become necessary .So, different ribs are used for enhancing the bond strength between steel reinforcement and high-performance concrete . There is little information in the available literature about the bond characteristics for the different forms of rib geometry of the deformed bars and its effect on behavior of high-performance concrete beams for different relative rib area( αsb ) and development length. The main objective of this research is to study the effect of bonded part and rib geometry of main steel bars on behavior of high-performance concrete beams, also Pattern of cracks, final mode of failure and deformation characteristics (deflection, slip, concrete strain and slope for beams) were investigated.

BEHAVIOUR OF HIGH-PERFORMANCE CONCRETE BEAMS AS AFFECTED BY BONDED PART AND RIB GEOMETRY OF MAIN STEEL REINFORCEMENT