一种低应变率下钢纤维混凝土本构关系
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摘要
采用岩石力学试验机,开展了同一低应变率下,钢纤维体积含量分别为0%、0.75%、1.5%、3%、4.5%、6%的混凝土材料的准静态力学试验,并获得了材料的应力-应变曲线,由试验结果可知:钢纤维混凝土材料的峰值应力、峰值应变随着纤维含量的增加而提高,材料达到峰值应力后呈现应力的应变软化特征。基于试验应力-应变曲线,提出了一种合理的钢纤维混凝土准静态本构关系,通过拟合试验应力-应变曲线,获得了相应的材料参数,拟合结果表明采用该形式的本构关系方程能很好地拟合试验曲线。
In this paper,quasi-static performance experiment for six kinds of concrete material with steel fiber volume ratio of 0%、0.75%、1.5%、3%、4.5%、6%respectively,was carried out by using a rock tri-axial testing machine.Stress-strain curves of steel fiber reinforced concrete with different steel fiber volume ratio were obtained at the same low strain rate.Experimental results show that with the increase of fiber content,peak strain and peak stress of steel fiber reinforced concrete material increase and the strain softening phenomenon occurs after the peak stress.Based on experimental results,a new constitutive equation of steel fiber reinforced concrete(SFRC)at low strain rate is proposed in this paper.By fitting experimental curve,the material parameters related to steel fiber contents were obtained.Fitting results show that the constitutive relation is in good agreement with the experimental data.
In this paper,quasi-static performance experiment for six kinds of concrete material with steel fiber volume ratio of 0%、0.75%、1.5%、3%、4.5%、6%respectively,was carried out by using a rock tri-axial testing machine.Stress-strain curves of steel fiber reinforced concrete with different steel fiber volume ratio were obtained at the same low strain rate.Experimental results show that with the increase of fiber content,peak strain and peak stress of steel fiber reinforced concrete material increase and the strain softening phenomenon occurs after the peak stress.Based on experimental results,a new constitutive equation of steel fiber reinforced concrete(SFRC)at low strain rate is proposed in this paper.By fitting experimental curve,the material parameters related to steel fiber contents were obtained.Fitting results show that the constitutive relation is in good agreement with the experimental data.
引文
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[9]王春来,徐必根,李庶林,等.单轴受压状态下钢纤维混凝土损伤本构模型研究[J].岩土力学,2006,27(1):151-154(WANG Chunlai,XU Bigen,LI Shulin,et al.Damage constitutive model of steel fiber reinforced concrete under uniaxial compression[J].Rock and Soil Mechanics,2006,27(1):151-154(in Chinese))
[10]Holmquist T J,Johnson G R.A computational constitutive model for glass subjected to large strains,high strain rates and high pressures[J].Journal of Applied Mechanics,2011,78(5):051003.
[11]Huang R Y,Wang Z L,Li Yongchi,et al.Study on the mechanical properties and constitutive model of steel fiber reinforced concrete[J].Low Temperature Architecture Technology,2009,134(8):32-34.
[12]严少华,钱七虎,孙伟,等.钢纤维高强混凝土单轴压缩下应力-应变关系[J].东南大学学报(自然科学版),2001,31(2):77-80(YAN Shaohua,QIAN Qihu,SUN Wei,et al.Stress-strain relationship of steel fiber high strength concrete under uniaxial compression[J].Journal of Southeast University(Natural science Edition),2001,31(2):77-80(in Chinese))
[2]刘永胜,王肖钧,金挺,等.钢纤维混凝土力学性能和本构关系研究[J].中国科学技术大学学报,2007,37(7):717-723(LIU Yongsheng,WANG Xiaojun,JIN Ting,et al.Study on the mechanical properties and constitutive relation of steel reinforced concrete[J].Journal of University of Science and Technology of China,2007,37(7):717-723(in Chinese))
[3]黄瑞源,李永池,章杰,等.钢纤维混凝土力学特性与本构模型研究[J].低温建筑技术,2009,31(8):32-34(HUANG Ruiyuan,LI Yongchi,ZHANG Jie,et al.Study on the mechanical properties and constitutive model of steel reinforced concrete[J].Low Temperature Architecture Technology,2009,31(8):32-34(in Chinese))
[4]陈德兴.钢纤维高强混凝土含损伤率型本构关系研究[D].中国科学技术大学,2009(CHEN Dexing.Study on constitutive relation of steel fiber high strength concrete with damage ratio[D].University of Science and Technology of China,2009(in Chinese))
[5]董毓利,谢和平,李世平.砼受压损伤力学本构模型的研究[J].工程力学,1996,13(1):44-53(DONG Yuli,XIE Heping,LI Shiping.Study on mechanical constitutive model of concrete compression damage[J].Engineering Mechanics,1996,13(1):44-53(in Chinese))
[6]许沭华,王肖钧,张刚明,等.KeVlar纤维增强复合材料动态压缩力学性能试验研究[J].实验力学,2001,16(1):26-33(XU Shuhua,WANG Xiaojun,ZHANG Gangming,et al.Experimental study on dynamic compressive mechanical properties of KeVlar fiber reinforced composites[J].Journal of Experimental Mechanics,2001,16(1):26-33(in Chinese))
[7]叶中豹.新型复合防护材料的动静态力学特性和工程应用研究[D].中国科学技术大学,2018(YE Zhongbao.New composite protective materials of the dynamic static mechanical properties and engineering application[D].University of Science and Technology of China,2018(in Chinese))
[8]钟晨,叶中豹,王颖,等.一种新形式非线性钢纤维混凝土本构关系[J].硅酸盐通报,2018,37(5):1583-1588(ZHONG Chen,YE Zhongbao,WANG Ying,et al.A new form of nonlinear steel fiber rein-forced concrete consitutive relation[J].Bulletin of the Chinese Ceramic Society,2018,37(5):1583-1588(in Chinese))
[9]王春来,徐必根,李庶林,等.单轴受压状态下钢纤维混凝土损伤本构模型研究[J].岩土力学,2006,27(1):151-154(WANG Chunlai,XU Bigen,LI Shulin,et al.Damage constitutive model of steel fiber reinforced concrete under uniaxial compression[J].Rock and Soil Mechanics,2006,27(1):151-154(in Chinese))
[10]Holmquist T J,Johnson G R.A computational constitutive model for glass subjected to large strains,high strain rates and high pressures[J].Journal of Applied Mechanics,2011,78(5):051003.
[11]Huang R Y,Wang Z L,Li Yongchi,et al.Study on the mechanical properties and constitutive model of steel fiber reinforced concrete[J].Low Temperature Architecture Technology,2009,134(8):32-34.
[12]严少华,钱七虎,孙伟,等.钢纤维高强混凝土单轴压缩下应力-应变关系[J].东南大学学报(自然科学版),2001,31(2):77-80(YAN Shaohua,QIAN Qihu,SUN Wei,et al.Stress-strain relationship of steel fiber high strength concrete under uniaxial compression[J].Journal of Southeast University(Natural science Edition),2001,31(2):77-80(in Chinese))