EXPERIMENTAL INVESTIGATION ON FLEXURAL BAHAVIOR OF RC BEAMS WITH GRADE HRB500

Based on 7 beams with grade HRB500 reinforcement of low-cost and high-performance,the failure modes,deformation characteristics and bearing capacities matched different strength concrete are analyzed.To test whether the formulas for calculating the bearing capacity,crack width and deflection in the existing code are suitable for the concrete beams with grade HRB500 reinforcement of high-performance.The result indicates that the value of bearing capacity is larger than the one calculated by the code,crack spacing measured is less than the one calculated by the code,but datas of crack width measured and calculated were represented in a fluctuate form,although the two are very close to each other,its calculated method can not use formula given in the code.And deflections measured are larger than the ones calculated by the code.As a result,a modified factor for calculating the deflections of the beam is given.