›› 2009, Vol. 30 ›› Issue (7): 1987-1992.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of damage constitutive model of SFRC considering effect of damage threshold

XUE Yun-liang, LI Shu-lin, LIN Feng, XU Hong-bin   

  1. School of Architectural and Civil Engineering, Xiamen University, Xiamen 361005, China
  • Received:2008-10-22 Online:2009-07-10 Published:2011-03-10

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Abstract:

Based on the characteristics of whole stress-strain curve of SFRC of different steel fiber volume ratios of laboratory test, the change of damage variable and the necessity of considering the influence of the damage threshold in developing the damage constitutive model of SFRC are discussed. Then, according to continuum damage theory and the statistical approaches of strength, the introduction of damage threshold based on the traditional Weibull random distribution of two parameters, the damage constitutive model of compression process of SFRC considering the damage threshold is proposed. This model can reflect the linear-elastic characteristics of SFRC deformation in low stress level or small deformation. Then when the value of damage threshold is determined by experience, the expression of two other parameters of Weibull random distribution is deduced through the geometric conditions of the whole stress-strain curve of SFRC. Finally, the analysis results of MATLAB contrast with uniaxial compression test results, it is shown that this model correctly reflects the stress-strain relation under uniaxial compression; and the value of damage threshold is discussed.

Key words: SFRC, damage threshold, microcosmic element strength, constitutive model

CLC Number: 

  • TU317
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