钢筋钢纤维增强混凝土板冲切性能试验研究

对13块无腹筋简支整浇钢筋钢纤维高强混凝土双向板进行试验,分析混凝土强度、钢纤维体积率和钢纤维掺加范围对板冲切性能的影响。试验结果表明:钢纤维的掺入对钢筋高强混凝土板的冲切性能的改善比较显著。随着钢纤维掺加范围的增加,局部钢纤维高强混凝土板冲切极限承载力和韧性呈线性提高,但掺加范围增大到2倍板厚时,再继续增加掺加范围冲切性能基本不再变化,可以通过该措施来减少钢纤维用量。

RESEARCH ON LOCAL STEEL FIBER HIGH-STRENGTH REINFORCED CONCRETE SLABS SUBJECTED TO PUNCHING SHEAR

The influence of the concrete strength, volume of steel fiber and filling range of steel fiber on punching shear performance of slabs was discussed through the experiment on the 13 steel fiber high-strength reinforced concrete two-way simple slabs. Furthermore, the failure mechanism of slabs subjected to punching shear was discussed. The test results show that steel fiber can improve obviously the punching shear performance of slabs. With the increases of the volume or filling range of steel fiber, the punching shear bearing capacity and ductility of local steel fiber high-strength reinforced concrete slabs increased. It was observed that the punching shear ultimate bearing capacity and ductility hardly increased when the filling range of steel fiber was two times of slab thickness. The measure can reduce the steel fiber content.