钢筋钢纤维高强混凝土箍筋梁剪切延性分析

Study of ductility of steel fiber reinforced high-strength concrete beams with stirrups

根据13根钢筋钢纤维高强混凝土矩形梁的剪切破坏试验进行了梁的剪切延性研究.参照受弯构件的延性分析,定义了梁剪切延性指标和能量吸收比,定量分析了钢纤维、箍筋、混凝土强度等级和剪跨比对梁剪切延性的影响,并比较了钢纤维和箍筋提高梁剪切延性的效率.试验结果表明,钢纤维虽不足以在根本上改变梁剪切破坏的脆性,但可以使其延性得到显著提高,钢纤维在体积掺率低于0.5%的条件下提高剪切延性的能力等效于等量箍筋.

A total of 13 rectangular beams are tested to study the shear deformability and the ductility of steel fiber reinforced high-strength concrete beams with web reinforcement. By means of the method of ductility analysis of flexural member, shear ductility index and energy absorption ratio are defined. After a detailed calculation, the influence of the main factors such as steel fiber, stirrups, strength of concrete and shear span ratio on shear ductility of beams is analyzed quantitatively. The effectiveness of stirrups and that of steel fibers on improving shear ductility of beams are compared. The result of this experiment indicates that steel fiber can evidently promote the ductility although it can not improve the brittleness of shear damage. When its volume ratio is less than 0.5%, it has the same effectiveness in increasing shear ductility of beams as to the equivalent amount of stirrups.