钢纤维掺量对钢筋混凝土桥面板冲切性能影响

通过对钢纤维体积率为0和0.38%的双向板试件进行冲切试验,得到试件的破坏形态、钢筋和混凝土荷载-应变规律等,进而量化评估钢纤维掺量对钢筋混凝土桥面板冲切性能的影响。结果表明:钢纤维体积率为0与0.38%的试件相比,相同荷载作用下后者的钢筋、混凝土应变较小;首条裂缝的出现时间推迟;试件在冲切破坏时挠度变形较大且板底表面混凝土脱落较少。

Effect of Steel Fiber Content on Punching Shear Performance of Reinforced Concrete Slab

In order to study the influence of steel fiber content on the punching performance of reinforced concrete slabs, we conducted the punching test of two-dimensional plate specimens with steel fiber volume fractions of 0 and 0.38%, and obtained the failure modes, the law of bars strains and concrete strains of the specimens. Then, we quantitatively evaluated the influence of steel fiber content on the punching performance of reinforced concrete slabs. The results show that comparing with the specimens with 0 and 0.38% steel fiber volume, the bars strains and concrete strains of the latter are less under the same load, and the first crack was delayed. The deflection of the specimen during punching failure is larger and less concrete on the bottom surface of the specimen shed.