再生微粉活性粉末混凝土单轴受压应力-应变曲线研究

Study on Uniaxial Compressive Stress-Strain Curve of Reactive Powder Concrete with Waste Brick Powder

为了进一步了解再生微粉活性粉末混凝土(RPC)的受压性能,通过试验分析并结合有限元模拟,研究了不同配比再生微粉RPC的单轴受压应力-应变曲线。利用有限元软件Ansys在细观层次上建立了随机分布钢纤维模型,建立的随机钢纤维模型能较好地反映实际情况。进而采用数值模拟的方法分析了钢纤维体积掺量对RPC受压应力-应变曲线的影响。研究结果表明,随着再生微粉对水泥替代率的增加,峰值应力减小,峰值应变和弹性模量略有降低但变化不显著。钢纤维的加入提高了再生微粉RPC的峰值应力、峰值应变和弹性模量,且随着钢纤维掺量增加,峰值应力增长,弹性模量有一定增长,峰值应变变化不明显。

In order to further understand the compression performance of RPC with waste brick powder,the stress-strain curve of RPC with waste brick powder was investigated through experimental analysis combined with finite element simulation.The random steel fiber finite element model at mesoscopic level was developed using Ansys.The model coincided well with the test results.Furthermore,the influence of steel fiber volume content on the compression curve of RPC was analyzed by numerical simulation.With the increase of cement replacement rate,the peak stress decreases,while the peak strain and elastic modulus decrease slightly but the change is not significant.The addition of steel fiber increased the peak stress,peak strain and elastic modulus of RPC.And with the increase of steel fiber content,the peak stress increased,the elastic modulus increased to a certain extent,and the peak strain did not change significantly.