陈宇良, 姜锐, 陈宗平, 张绍松. 复合受剪钢纤维再生混凝土破坏机理及强度计算[J]. 工程力学, 2023, 40(3): 88-97, 128. DOI: 10.6052/j.issn.1000-4750.2021.08.0677
引用本文: 陈宇良, 姜锐, 陈宗平, 张绍松. 复合受剪钢纤维再生混凝土破坏机理及强度计算[J]. 工程力学, 2023, 40(3): 88-97, 128. DOI: 10.6052/j.issn.1000-4750.2021.08.0677
CHEN Yu-liang, JIANG Rui, CHEN Zong-ping, ZHANG Shao-song. FAILURE MECHANISM AND STRENGTH CALCULATION OF COMPOSITE SHEAR STEEL FIBER RECYCLED CONCRETE[J]. Engineering Mechanics, 2023, 40(3): 88-97, 128. DOI: 10.6052/j.issn.1000-4750.2021.08.0677
Citation: CHEN Yu-liang, JIANG Rui, CHEN Zong-ping, ZHANG Shao-song. FAILURE MECHANISM AND STRENGTH CALCULATION OF COMPOSITE SHEAR STEEL FIBER RECYCLED CONCRETE[J]. Engineering Mechanics, 2023, 40(3): 88-97, 128. DOI: 10.6052/j.issn.1000-4750.2021.08.0677

复合受剪钢纤维再生混凝土破坏机理及强度计算

FAILURE MECHANISM AND STRENGTH CALCULATION OF COMPOSITE SHEAR STEEL FIBER RECYCLED CONCRETE

  • 摘要: 为研究钢纤维再生混凝土在复合受剪状态下的力学性能,以取代率、法向应力和钢纤维掺量为变化参数,设计了102个标准立方体试件进行复合受剪试验。观察了钢纤维再生混凝土在直剪、压剪作用下的破坏形态,获取了其在直剪、压剪作用下的全过程剪切应力-位移曲线,深入分析了取代率、法向应力和钢纤维掺量对钢纤维再生混凝土剪切强度、峰值位移的影响规律。结果表明:随着法向应力的增大,剪切强度逐渐增大;随着取代率的增加,掺量为0%的钢纤维再生混凝土剪切强度随之减小,掺量为1%的钢纤维再生混凝土剪切强度先增大后减小;与掺量为0%的钢纤维再生混凝土相比,掺量为1%的钢纤维再生混凝土平均剪切强度提高了10.77%;提出了剪切强度公式,所得计算值与试验值吻合良好。

     

    Abstract: To investigate the mechanical behavior of steel fiber recycled concrete under a composite shear condition, 102 standard cubic specimens were designed for the composite shear test with a substitution rate, with normal stress and with steel fiber content as changing parameters. The failure modes of steel fiber recycled concrete under direct shear and compression shear were observed, and the shear stress-displacement curves of the whole process were obtained. The influences of substitution rate, of normal stress and, of steel fiber content on the shear strength and on the peak displacement of steel fiber recycled concrete were analyzed in depth. The research shows that shear strength increases with the increase of normal stress. The shear strength of recycled concrete with steel fiber content of 0% decreases with the increase of substitution rate. The shear strength of recycled concrete with steel fiber content of 1% increases first and then decreases with the increase of substitution rate. The average shear strength of steel fiber recycled concrete with the content of 1% increases by 10.77% compared with the steel fiber recycled concrete with the content of 0%. The shear strength formula is presented, and the calculated results agree well with the test results.

     

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