高掺量钢纤维自密实混凝土梁抗弯性能分析

Flexural behavior analysis of self-compacting concrete beam reinforced with high content of steel fiber

通过不断试配,获得体积掺量为3.0%的高掺量钢纤维自密实混凝土的配置方法,并在混凝土力学性能测试中得到相应配合比下混凝土的力学性能指标。利用ANSYS有限元软件,对所设计的试验梁以实测材料参数为依据进行数值模拟。计算结果表明,体积掺量为3.0%的钢纤维钢筋自密实混凝土梁与普通钢筋自密实混凝土梁相比,其开裂荷载、屈服荷载、弯曲韧性及结构刚度得到明显提升。通过对3.0%的高掺钢纤维自密实钢筋混凝土梁与普通钢筋自密实混凝土梁在裂缝宽度随荷载的变化规律及同一截面不同高度处混凝土应变的分布情况的对比分析,发现钢纤维具有良好的阻裂作用,并能有效提高混凝土的极限拉应变。

A configuration method of 3.0% volume quantities of steel fiber reinforced self-compacting concrete has been got through continuous trial mixture in this study. Based on the concrete mechanics performance tests, the mechanical properties of concrete index under various mixing ratios are obtained. According to the measured material properties, the testing beams are simulated using ANSYS finite element software . The calculation results show that the cracking load, yielding load, flexural toughness and structure stiffness of 3.0% volume quantities of the steel fiber reinforced self-compacting concrete beam, compared with ordinary reinforced self-compacting concrete beams, are significantly increased. It is found that the anti-crack function of the steel fiber is obvious by comparative analysis of two groups of testing beams in the change law of the crack width changing with the load and the same cross section at different heights of concrete strain distribution. It can also effectively tensile strain of concrete. The analysis results can provide a reference for the similar research improve the ultimate projects.