EXPERIMENTAL RESEARCH ON STIFFNESS OF HIGH-STRENGTH REINFORCED REACTIVE POWDER CONCRETE SIMPLE BEAM

Based on bending test of eight high strength reinforced reactive powder concrete simple beams by changing the longitudinal rebar ratio and rebar grade of test beams，it was analyzed the load-bearing properties and deformation characteristics of the test beams． The results showed that with the reinforcement ratio and rebar grade were increased，the bearing capacity and the overall stiffness of the test beams also were increased; slowed the longitudinal reinforcement getting into the plastic stage，restrained the development of cracks effectively，reduced the beam deflection at load stage． According to the forced characteristics of high-strength reinforced reactive powder concrete beams，bending stiffness calculation formulas were set up，through which calculated values agreed well with the experimental values，which provided a reference for design of high strength reinforced reactive powder concrete beam．