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为了研究不同抗冲切键在钢筋混凝土板柱节点的受冲切性能,对配置普通箍筋(试件GB)、U型箍筋(试件UB)和抗剪锚栓(试件MB)3种类型抗冲切键的钢筋混凝土板柱节点进行试验。通过对破坏形态、极限承载力、变形、混凝土和钢筋应变及抗冲切键的应变分析,结果表明:3类试件冲切锥斜截面坡度分别为20°(试件GB)、27°(试件UB)和12°(试件MB),配置锚栓试件的极限承载力和延性都有提高;3类试件均表现为脆性破坏形态,虽然试件UB在承载力方面优于试件GB,提高幅度达到9%,但是挠度提高仅为6.6%,且破坏形态没有发生变化,与试件GB相比,试件MB不仅承载能力提高了11.5%,而且变形能力改善更为明显,提高幅度达到42.9%,在失效前由呈现无任何征兆的脆性破坏转为具有一定延性的破坏形式;3类试件中抗冲切键均起到限制裂缝开展的目的,与试件GB不同,试件UB和试件MB距柱头前两排抗冲切键承担的荷载更多,限制裂缝开展更加有效。
In order to study the punching properties of different punched shear bond in the column of reinforced concrete slab columns, the results of the tests on the punching properties of common column stirrup (specimen GB), U-stirrup (specimen UB) and shear anchor bolt (specimen MB) 3 All kinds of punching and cutting of reinforced concrete slab nodes were tested. The results of the strain analysis of the failure mode, the ultimate bearing capacity, the deformation, the strain of the concrete and steel bar and the anti-punching shear keys show that the inclined sections of punching taper of the three kinds of specimens are 20 ° (GB), 27 ° ( (UB) and 12 ° (MB), the ultimate bearing capacity and ductility of anchor specimens were all increased. All three specimens showed brittle fracture morphology. Although the specimen UB was superior to the test specimen in bearing capacity Piece GB increased by 9%, but the deflection increased only 6.6%, and the failure morphology did not change. Compared with specimen GB, specimen MB not only increased the carrying capacity by 11.5%, but also improved the deformation ability more obviously. The improvement range reached 42.9%. Before the failure, the brittle failure without any indication changed to the damage form with a certain ductility. The punching and cutting in all three kinds of specimens all played the purpose of limiting the crack initiation. Compared with GB, Specimens UB and specimen MB bear more load away from the first two rows of punches at the top of the stigma to limit crack initiation more effectively.