钢筋钢纤维混凝土牛腿受剪承载力试验研究

根据12根钢筋钢纤维混凝土牛腿受剪试件的试验结果,讨论了钢纤维体积率、剪跨比、钢纤维混凝土强度对钢筋钢纤维混凝土牛腿斜截面破坏形态和受剪承载力等的影响,建立了钢筋钢纤维混凝土牛腿受剪承载力的计算模型,给出了与钢筋混凝土牛腿计算公式相衔接的钢筋钢纤维混凝土牛腿受剪承载力的计算公式,并进行了数值计算。结果表明,钢纤维对钢筋混凝土牛腿斜截面破坏形态影响较小,但能够提高牛腿的延性。随钢纤维体积率和钢纤维混凝土强度的增加,钢筋钢纤维混凝土牛腿的斜截面受剪承载力逐渐提高,随剪跨比的增大,受剪承载力随之降低。数值计算时,以达到钢纤维混凝土抗剪强度为破坏标准来控制迭代收敛,计算结果与试验结果吻合较好。

Experimental study on shear capacity of reinforced concrete corbel with steel fiber

Based upon the experimental results of the shear capacity of 12 reinforced concrete corbels with steel fiber,this paper discusses the effects of steel fiber volume ratio,shear span ratio and steel fiber concrete strength on the failure pattern of oblique section and shear capacity of reinforced concrete corbel with steel fiber.A calculating model of shear capacity for the reinforced concrete corbels with steel fiber is set up.Finally,the relative formula for calculating shear capacity for reinforced concrete corbel with steel fiber,which is in conjunction with that for calculating reinforced concrete corbels,is given.Numerical calculation is also carried out.The results indicate that the steel fibers have little effect on the failure mode of reinforced concrete corbel with steel fiber,but the ductility of reinforced concrete corbel can be improved.The shear capacity is increased with the increase of the volume fractions of steel fibers and steel fiber concrete strength.With the increase of shear span ratio,the shear capacity decreases.In numerical calculation,the calculated results coincide with the test data regarding the shear strength as failure criterion to control iterated convergence.