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一种新形式低应变率下钢纤维混凝土本构关系
A new form of the constitutive relation of steel fiber reinforced concrete under low strain rate
投稿时间: 2017-05-21  最后修改时间: 2017-08-05
DOI:
中文关键词:  钢纤维混凝土  准静态试验  纤维含量  本构关系
英文关键词:Steel Fiber Reinforced Concrete(SFRC)  Quasi-static compression experiment  Fiber content  Constitutive relation
基金项目:国家自然科学基金资助项目(11402266,11202206);安徽高等学校省级自然科学重点研究项目 (KJ2016A315)
作者单位E-mail
叶中豹 中国科学技术大学 yzb@mail.ustc.edu.cn 
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中文摘要:
      本文采用岩石三轴试验机分别进行了钢纤维体积率为0%、0.75%、1.5%、3%、4.5%、6%的六种混凝土材料准静态性能试验,得出了同一低应变率下,不同钢纤维含量的应力-应变关系曲线,实验结果表明:随着纤维含量的增加,钢纤维混凝土材料的峰值应变,峰值应力都随之提高,并在峰值应力之后出现应力的应变软化现象。以实验结果为基础,提出了一种新形式低应变率下钢纤维混凝土本构关系方程,通过对试验曲线的拟合,得到与钢纤维 含量相关的材料参数,拟合结果表明采用该本构关系与试验数据吻合较好。
英文摘要:
      Using rock tri-axial compression test experimental system, we carried out the quasi-static compression experiment of steel fiber reinforced concrete with fiber volume ratio of 0%、0.75%、1.5%、3%、4.5% and 6%, Draw different steel fiber content, the same strain rates of stress - strain curves, The results showed that: With the increase of fiber content, the peak stress are increased, and the strain softening after the peak stress was observed. Based on the test results, a new type of constitutive relation is proposed, the details how to get the equation and the material parameters is discussed completely were used to fit the experiment curves. Good agreement between numerical simulations and experiment curves is achieved , it is concluded that the new constitutive relation proposed is perfect for steel fiber reinforced concrete.
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