高强变肋钢筋与混凝土间粘结锚固性能梁式试验

Experiments on the performance of bond anchorage between high strength variable rib reinforcement and concrete

为研究横肋间距增大对630 MPa级高强钢筋与混凝土间的粘结锚固性能的影响,文中采用梁式粘结试验方法,对42根标准外形钢筋和横肋间距增大钢筋与混凝土的粘结锚固性能进行试验,对比分析了混凝土保护层厚度、钢筋直径、锚固长度等因素对两类钢筋与混凝土粘结锚固性能的影响。结果表明:横肋间距增大的630 MPa级高强钢筋与混凝土的粘结强度不低于标准外形高强钢筋,两类钢筋与混凝土的粘结强度随混凝土强度、钢筋直径、锚固长度变化规律基本一致。横肋间距增大对630 MPa钢筋与混凝土的粘结锚固性能无显著影响。

To study the influence of the increase of cross rib spacing on the bond-slip behavior between 630 MPa high-strength steel bars and concrete, a test was carried out on the bond-slip behavior between steel bars and concrete by the beam bond test method, with using 42 standard shape steel bars and reinforcement with increased cross rib spacing. The influences of the thickness of concrete cover, diameter of rebars and anchorage length on the bond and anchorage performance of two types of rebars and concrete were analyzed.The results show that the bond strength between 630 MPa high-strength steel bar and concrete with increased cross rib spacing is not lower than that of standard shape high-strength steel bars, and the change of bond strength of two types of steel bars and concrete is basically consistent with that of concrete strength, steel bar diameter and anchorage length. The increase of the distance between transverse ribs has no significant effect on the bond-slip behavior of 630 MPa steel bar and concrete.