Abstract

The uniaxial compressive experiment of steel fiber reinforced concrete cylinder was carried out by microcomputer controlled electro-hydraulic servo pressure testing machine, which studied the effects on the types of steel fiber, fiber volume fraction and concrete strength grade to uniaxial compressive behavior of steel fiber reinforced concrete. The results showed that steel fibers can significantly improve the compressive strength, peak strain of concrete, and ultimate compressive strain. The growth rate increases with the increase of steel fiber mix proportion, and decreases with the increase of concrete strength grade. Based on the test results, the calculated formulas of axial compression strength and peak strain of different types of steel fiber concrete were revised, and their rationality was verified by comparison with the test results. For the stress–strain curve, a suitable constitutive relationship model was selected. Comparison with the test curve proved that the model can better describe the whole process of steel fiber concrete under uniaxial compression.

摘要

采用微机控制的电液伺服压力试验机对钢纤维混凝土筒体进行单轴抗压试验，研究了钢纤维种类、纤维体积分数和混凝土强度等级对钢纤维混凝土单轴抗压性能的影响。具体的。结果表明，钢纤维可以显着提高混凝土的抗压强度、峰值应变和极限压应变。增长率随着钢纤维配合比的增加而增加，随着混凝土强度等级的增加而降低。根据试验结果，对不同类型钢纤维混凝土的轴压强度和峰值应变计算公式进行了修正，并通过与试验结果的对比验证了其合理性。对于应力-应变曲线，选择了合适的本构关系模型。与试验曲线对比证明，该模型能较好地描述钢纤维混凝土在单轴受压下的全过程。