钢筋钢纤维高强混凝土板冲切承载力

ULTIMATE BEARING CAPACITY OF STEEL FIBER REINFORCED HIGH-STRENGTH CONCRETE SLABS SUBJECTED TO PUNCHING SHEAR

通过对6块尺寸为1 800 mm×1 800 mm×150 mm钢纤维高强混凝土板的冲切试验,研究混凝土强度等级和钢纤维体积率对板冲切极限承载力的影响。结果表明:钢纤维高强混凝土板冲切破坏之前的变形主要是弯曲变形,钢纤维的掺入提高了钢筋混凝土板的冲切承载力。在试验结果的基础上,运用统一强度理论和塑性极限分析方法,建立钢筋钢纤维高强混凝土板冲切极限承载力的计算公式。

Influences of concrete strength and steel fiber volume fraction on the ultimate bearing capacity of reinforced highstrength concrete square slabs subjected to punching shear are investigated through the experiments on six reinforced steel fiber reinforced high-strength concrete square slabs. The test results show that the deformation of slab before punching shear failure is caused by bending deformation and the steel fiber increases the ultimate bearing capacity of reinforced high-strength concrete square slabs. Finally, the formulas of ultimate bearing capacity are gotten based on the unified strength theory.