部分钢纤维增强高强混凝土剪力墙正截面承载力计算

Normal Section Bearing Capacity of Partial Steel Fiber Reinforced High Strength Concrete Shear Wall

在3片剪跨比为2.03的高强混凝土剪力墙试件低周反复加载试验的基础上,对比研究了未掺加钢纤维、仅边缘构件增强以及整体增强3种不同情况下构件的破坏模式、滞回性能和承载力情况.结果表明3片剪力墙均呈现受弯破坏模式,钢纤维增强后的剪力墙滞回曲线和极限荷载均高于普通高强混凝土,但两者相差不大.在此基础上,采用ABAQUS程序研究了钢纤维掺加宽度比例、纤维体积率、轴压比等参数对该构件正截面承载力的影响,提出了考虑钢纤维掺加宽度比例、钢纤维体积率、轴压比等因素的部分钢纤维增强高强混凝土剪力墙正截面承载力计算公式.将此公式计算结果与已有试验数据进行对比,平均误差为3.9%,证明了该公式的可靠性,可为部分钢纤维增强高强混凝土剪力墙正截面承载力计算提供依据.

On the basis of low cycle repeated loading test of three specimens of high strength concrete shear wall with shear span ratio of 2.03,the failure mode,hysteresis performance and bearing capacity of the members were analyzed under three different conditions: without steel fiber,with steel fiber only in edgy member and in overall shear wall. The results show that all three shear walls exhibit bending failure mode,and the hysteresis curve and ultimate load of the shear wall with steel fiber are higher than those of high strength concrete wall without steel fiber,but the difference between the two is small. On this basis,the influence of steel fiber blending width,fiber volume ratio and axial compression ratio on the normal section bearing capacity of the member was studied by ABAQUS program,and a formula for calculating the strength of partial steel fiber reinforced high strength concrete shear walls considering factors such as steel fiber blending width,steel fiber volume ratio and axial compression ratio is proposed. The calculation result of this formula is compared with the existing experimental data,and the average error is 3.9%,indicating the reliability of the formula,which can provide basis for calculating the normal section bearing capacity of some partial fiber reinforced high strength concrete shear walls.