组合式箍筋双筋混凝土梁受力性能试验研究

Experimental study on mechanical behavior of RC beam with compression reinforcement using overlapping hoops

组合式箍筋是预制装配整体式混凝土结构施工关键技术之一。为验证组合式箍筋的上部箍肢是否可有效约束双筋梁上部受压钢筋,制作13根梁进行对比试验研究。试验中受压钢筋达到或接近屈服。结果表明,与常规封闭箍筋相比,采用组合式封闭箍筋的双筋梁受弯和受剪性能与普通封闭式箍筋梁接近。梁受弯破坏时受压纵筋被组合式箍筋有效约束,受压钢筋没有发生失稳现象。

Overlapping hoops are often used in precast concrete structures for the convenience of construction. However,it is not clear whether the steel bars in compression can be effectively constrained by the two separated parts of the hoops. To clarify this,in total 13 concrete beams were casted and experimentally studied with their compression reinforcements almost being of yield. It was found that,the mechanical behavior of the beam with overlapping hoops is almost the same as the ones using normal closed hoops. The steel bars in compression can be effectively constrained by the overlapping hoops, as the steel bars do not fail due to unstability.