Research On Calculation Method Of Shear Capacity Of Reinforced Concrete Beams

According to the test data of 231 shear-compression failure reinforced concrete beams without web reinforcement test data(including 199 beams under concentrated loads and 32 beams under distributed loads) and 307 reinforced concrete beams with web reinforcement (including 152 domedtic and 155 overseas), using regression analysis method, the statistic calculating formula of shear capacity of shear failure beams with 95 percentage degree of confidence is proposed in this articles,then compared this calculation methods with existing stardand. Main conclusions of this paper are as follows:1. Based on the collected 307 (including 152 domedtic and 155 overseas) test data under concentrated load of reinforced concrete beams with web reinforcement and the regression analysis, a calculation method of shear capacity of reinforced concrete beams with web reinforcement with 95 percentage degree of confidence was proposed as follow:The influence of generalized of shear span ratio was not considered in this method. Comparing the ratio of the experimental values and the calculated values, the result isμ=1.491,σ=0.432,δ=0.290.2. The calculation method of shear capacity of reinforced concrete beams without web reinforcement is:Based on the collected 231 (including 199 beams under concentrated loads and 32 beams under distributed loads) test data of reinforced concrete beams without web reinforcement. Comparing the ratio of the experimental values and the calculated values, the result isμ=2.244,σ= 1.310,δ=0.584.3. When considering the shear span ratio: Whereλ=M/Vh0, and 1≤λ≤3. whenλ<1, takeλ=1, whenλ>3, takeλ=3.Based on the collected 199 beams under concentrated loads test data of reinforced concrete beams without web reinforcement. Comparing the ratio of the experimental values and the calculated values, the result isμ=1.714,σ=0.604,δ=0.352.4. Considering the shear span ratio, the calculation method of shear capacity of reinforced concrete beams with web reinforcement is:Where whenλ<1, takeλ=1, whenλ>3, takeλ=3.Comparing the ratio of the experimental values and the calculated values, the result isμ= 1.280,σ=0.302,δ=0.236.