Stochastic Damage Constitutive Law for Firedamaged Concrete

Abstract:

Based on the damage configuration and failure feature of firedamaged concrete,this paper presents studies of the stochastic evolution law of firedamaged concrete (FDC) under uniaxial tension and uniaxial compression.The stochastic damage constitutive relationship models of FDC under uniaxial tension and uniaxial compression are established with the Weibull distribution and spring damage element model by considering the damage factors such as the initial damage of concrete,the damage caused by elevated temperature and the damage healing under crack closure.Through the proposed method,four mechanical features of FDC are explained by theoretical derivation rather than test data fitting.The theoretical derivation results are compared with test data and the proposed method proves feasible in explaining the failure mechanism of FDC.