A Stochastic Rate dependent Damage Model for Concrete

Abstract:

By considering the strain rate effect of concrete induced by the pore water, a mesoscopic rate dependent damage model was developed based on a compound system made up of a series of elastic elements and viscous elements. Then by introducing the developed rate dependent damage model to describe the damage evolution, the stochastic damage model was proposed to model the nonlinear behaviors of concrete under monotonic and hysteretic uniaxial loading. Based on the experimental data, the proposed stochastic damage model of concrete was systematically verified. The simulation results indicate that the typical nonlinear behaviors of concrete, including the softening, the residual strain and the rate dependency, can be well described by the proposed model. The developed model offeres a good choice for the nonlinear simulation of concrete structures.

Key words:concrete; damage; plasticity; rate dependency; cyclic loading