丁发兴, 吴霞, 向平, 余志武, 聂磊鑫. 钢纤维混凝土多轴损伤比强度准则[J]. 工程力学, 2022, 39(9): 123-132. DOI: 10.6052/j.issn.1000-4750.2021.05.0372
引用本文: 丁发兴, 吴霞, 向平, 余志武, 聂磊鑫. 钢纤维混凝土多轴损伤比强度准则[J]. 工程力学, 2022, 39(9): 123-132. DOI: 10.6052/j.issn.1000-4750.2021.05.0372
DING Fa-xing, WU Xia, XIANG Ping, YU Zhi-wu, NIE Lei-xin. DAMAGE RATIO STRENGTH CRITERION FOR STEEL FIBER REINFORCED CONCRETE UNDER MULTIAXIAL STRESSES[J]. Engineering Mechanics, 2022, 39(9): 123-132. DOI: 10.6052/j.issn.1000-4750.2021.05.0372
Citation: DING Fa-xing, WU Xia, XIANG Ping, YU Zhi-wu, NIE Lei-xin. DAMAGE RATIO STRENGTH CRITERION FOR STEEL FIBER REINFORCED CONCRETE UNDER MULTIAXIAL STRESSES[J]. Engineering Mechanics, 2022, 39(9): 123-132. DOI: 10.6052/j.issn.1000-4750.2021.05.0372

钢纤维混凝土多轴损伤比强度准则

DAMAGE RATIO STRENGTH CRITERION FOR STEEL FIBER REINFORCED CONCRETE UNDER MULTIAXIAL STRESSES

  • 摘要: 以损伤比强度理论为基础,建立了钢纤维混凝土真三轴损伤比强度准则,并根据钢纤维混凝土试验资料,推荐了钢纤维混凝土损伤比变量表达式中的6个经验参数。利用钢纤维混凝土在单轴、双轴和三轴受力状态下的应力-应变曲线试验结果验证了损伤比取值合理性,对比了单轴受拉、单轴受压和双轴等压等典型受力状态下钢纤维混凝土和普通混凝土损伤比变量取值的差异。通过与国内外共104组钢纤维体积率为0.5%~2.5%的钢纤维混凝土三轴强度试验资料的比较,表明六经验参数钢纤维混凝土损伤比强度准则的三维破坏包络面接近已有认识;通过与国内外强度准则比较,表明损伤比强度准则与钢纤维混凝土三轴试验数据有较高的吻合度。对于围压三轴受力状态,提出简化的钢纤维混凝土常规三轴强度准则,并与已有常规三轴强度准则进行比较分析。此外,对于材料处于二轴受力,推荐了简化的损伤比二轴强度准则中的经验参数取值。

     

    Abstract: Based on the damage ratio strength theory, the true triaxial damage ratio strength criterion for steel fiber reinforced concrete (SFRC) was established. The six empirical parameters in the expression of the damage ratio variable of the criterion were recommended according to the test data of SFRC. The values of the damage ratio variable were verified by the experimental results of SFRC under uniaxial, biaxial and triaxial loading conditions, and the values of damage ratio of SFRC under uniaxial tension, uniaxial compression and biaxial equal compression stress conditions were compared with those of plain concrete. By comparing the predicted results with the experimental data of 104 SFRC specimens containing 0.5%~2.5% of fibers, against some strength criteria, the proposed criterion is verified that it can represent the triaxial failure surfaces of SFRC and give relatively good approximation of the experimental results. A simplified conventional triaxial damage ratio strength criterion for SFRC was proposed for confining triaxial stress state, and was compared with the existing conventional triaxial strength criteria. In addition, the empirical parameters of the simplified biaxial damage ratio strength criterion were recommended for biaxial stress states.

     

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