混凝土的弹塑性损伤双面本构模型

针对混凝土材料拉压应变空间下损伤机制的不同,结合连续损伤力学和塑性理论建立了一个全新的本构模型。该模型中损伤和塑性变形的演变由应变空间的同一个非弹性曲面来控制,但对拉压应变空间中非弹性曲面的演变分别采用了随动强化法则和各向同性演化规律。计算结果表明,该模型能较好地描述混凝土材料在单轴及多轴单调加载和低周反复荷载下的典型非线性特征。

A two-surface plasticity/damge constitutive model for plain concrete

In order to capture the different responses of concrete under tensile and compressive strain space,a novel constitutive model is proposed which combines the theories of plasticity and continuum damage mechanics.This model is strain based and the same inelastic surfaces are used for both damage evolution and permanent deformation;the evolution of the inelastic surfaces is governed by an isotropic evolution law for compression and a kinematic law for tension.It is proved by numerical examples that the model can well describe the performance of concrete under uniaxial and multiaxial monotonic and cyclic loading.