小剪跨比牛腿承载性能试验研究

为了分析小剪跨比钢筋混凝土牛腿在竖向荷载作用下的破坏情况,通过试验研究了不同剪跨比和混凝土强度对牛腿承载能力的影响,分析了牛腿纵筋的承载力-应变曲线和破坏形态.结果表明:在小剪跨比情况下,牛腿破坏形态大致可分为剪切破坏和斜压破坏2种破坏形态;混凝土强度的提高使钢筋混凝土牛腿受剪承载力增大而且基本呈线性关系;随着剪跨比的增大,牛腿的极限承载力明显下降;在荷载一定的情况下,裂缝宽度基本上随剪跨比的增大而增大,钢筋的应变值随剪跨比的减小而变小.

Experimental study on carrying capability of corbels of small shear span ratio

In order to analyze the failure mechanisms of the reinforced concrete corbels of small shear span ratio under a vertical load,the effects of shear span ratio and concrete strength on the carrying capacity of reinforced concrete corbels were studied through experiments.The curve of carrying capacity-strain and failure modes was analyzed.The results indicate that the failure modes of reinforced concrete corbels of small shear span can be classified into two types: shear failure,and diagonal compression failure.The carrying capacity of the reinforced concrete corbels increases with the increase of the concrete strength and the decrease of shear span ratio,showing linear relations.The crack width and steel strain increase with the increase of shear span ratio at a given load.