金浏, 贾立坤, 张仁波. 低温下钢纤维混凝土断裂行为细观数值研究[J]. 工程力学, 2023, 40(S): 200-206. DOI: 10.6052/j.issn.1000-4750.2022.06.S023
引用本文: 金浏, 贾立坤, 张仁波. 低温下钢纤维混凝土断裂行为细观数值研究[J]. 工程力学, 2023, 40(S): 200-206. DOI: 10.6052/j.issn.1000-4750.2022.06.S023
JIN Liu, JIA Li-kun, ZHANG Ren-bo. MESOSCALE FINITE ELEMENT ANALYSIS FOR FRACTURE BEHAVIORS OF STEEL FIBER REINFORCED CONCRETE AT LOW TEMPERATURE[J]. Engineering Mechanics, 2023, 40(S): 200-206. DOI: 10.6052/j.issn.1000-4750.2022.06.S023
Citation: JIN Liu, JIA Li-kun, ZHANG Ren-bo. MESOSCALE FINITE ELEMENT ANALYSIS FOR FRACTURE BEHAVIORS OF STEEL FIBER REINFORCED CONCRETE AT LOW TEMPERATURE[J]. Engineering Mechanics, 2023, 40(S): 200-206. DOI: 10.6052/j.issn.1000-4750.2022.06.S023

低温下钢纤维混凝土断裂行为细观数值研究

MESOSCALE FINITE ELEMENT ANALYSIS FOR FRACTURE BEHAVIORS OF STEEL FIBER REINFORCED CONCRETE AT LOW TEMPERATURE

  • 摘要: 为了探讨钢纤维混凝土材料在低温下的断裂行为,通过有限元分析方法,在细观层次建立了不同钢纤维体积分数(V=0.0%、0.5%和1.0%)的混凝土试块三维数值模型,分别在3个温度点下(T=20 ℃、−40 ℃和−80 ℃)进行了劈裂抗拉强度试验以及三点弯曲加载试验,得到了相应的破坏模式以及荷载-跨中挠度曲线。研究结果表明,混凝土的断裂能随着温度的降低呈增大趋势,且钢纤维体积分数越大,断裂能越大。而混凝土的特征长度随着温度的降低逐渐减小,但纤维的加入很大程度地增大了其特征长度。

     

    Abstract: In order to investigate the fracture behavior of steel fiber reinforced concrete materials at low temperatures, 3D numerical models of concrete specimens with different volume fractions of steel fibers (V=0.0%, 0.5% and 1.0%) were developed at the meso-scale by means of finite element analysis, and splitting tensile strength tests as well as three-point bending loading tests were conducted at three temperatures (T=20 ℃, −40 ℃ and −80 ℃). The corresponding damage modes and load-span deflection curves were obtained. The results show that the fracture energy of concrete tends to increase with the decrease of temperature, and the fracture energy increases with the increase of fiber volume fraction. The characteristic length of concrete decreases with decreasing temperature, but the addition of fibers largely increases its characteristic length.

     

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