基于细观层次的塑钢纤维混凝土破坏机理数值模拟分析

NUMERICAL SIMULATION OF FAILURE MECHANISM OF STEEL FIBER REINFORCED CONCRETE FAILURE BASED ON MICRO-SCOPE

为掌握塑钢纤维混凝土的受压破坏机理,通过自编程序建立不同掺量下的塑钢纤维混凝土二维平面数值模型,对比分析不同模型的水平向位移及应力云图、垂直向位移及应力云图和裂纹开展情况,结果表明塑钢纤维使混凝土内部应力重分布,可改善混凝土传力路径,减少裂缝数量,减缓裂缝开展速度,提高混凝土的极限承载力。

In order to study the mechanism of steel fiber reinforced concrete compressive failure fully, the program has been compiled by the authors and different dosage of steel fiber concrete 2-D plane numerical model have been developed. The horizontal displacement and the stress nephogram, the vertical displacement,and the stress cloud nephogram, the crack development of different models are compared and analyzed.The investigation shows that steel fiber could make reinforced concrete internal stress distribution, improve the loading path of the concrete, reduce the number of cracks, slow crack expanding speed, improve the ultimate bearing capacity of concrete.