Experimental Study Of Reinforced Ultra-high-performance Concrete Beam Ductility Performance

Ultra High Performance Concrete (Ultra-High Performance Concrete, referred UHPC) isa kind of ultra high strength, high durability, high toughness of concrete, and has excellentimpact resistance, fatigue resistance and excellent durability, in the field of civil engineeringworks have broad application prospects.Modern architecture requires not only high durability, but also requires sufficientcapacity, high-rise building, diversification, makes UHPC ductility performance requirementsare also increasing. UHPC beams reinforced steel fiber and adding appropriate amount oflongitudinal reinforcement ratio can improve concrete ductility, force and deformation abilityto inhibit crack development. Reinforced UHPC beams to reduce the amount of steel fibers,longitudinal section using appropriate reinforcement ratio, both to ensure the economy butalso improve the ductility, improved brittleness problem. This paper ductility of reinforcedUHPC beams were tested research, the main contents are as follows:Produced eight UHPC test block, its compressive strength test, find the compressivestrength test values.Produced15reinforced UHPC beam specimen, through cross-concentrated load test,observe the failure modes of different groups of the beam, deformation, cracks carry state, bychanging the steel fiber content, longitudinal reinforcement ratio, the ductility of each beamanalysis situation.Obtained by testing the load-deflection curve, sectional strain distribution, calculate thedisplacement ductility factor and curvature ductility factor analysis of steel fiber content, theimpact of longitudinal reinforcement ratio on the ductility of reinforced UHPC beams andreinforced UHPC beam to determine the configuration of the materials used best ratio.On the basis of ordinary reinforced concrete beam flexural capacity is calculated basedon the proposed reinforced UHPC beam ultimate moment is calculated and compared with thetest results, provided the basis for the engineering applications.