【Author】LI Jing-shuang; WANG Zhe; XING Yi-chuan

【Abstract】 In order to simulate the behavior of concrete under genuine triaxial compression, a plastic constitutive model is constructed on the data analysis of conventional and genuine triaxial compressive experiments on concrete. In this model, the zero value of initial yield stress is considered, the four-parameter Hsieh-Ting-Chen failure criterion is accepted, and the hardening and softening of materials are assumed to obey the isotropic rule and the non-associated flow rule. The dilation is related to plastic work, and the lode angle is introduced in the plastic potential function. This model is validated against conventional and genuine triaxial compressive experiments conducted on cubic concrete specimens of two different mix proportions, in which six groups of monotonous proportional compression test are included in each proportion.

【Key words】 concrete; constitutive law; non-associated rule; plasticity; dilation; genuine triaxial compression