混凝土动力随机损伤本构关系

A Stochastic Rate dependent Damage Model for Concrete

摘要:

考虑混凝土中的水对材料率敏感性的影响，引入包含黏性元件和弹性元件的细观模型，推导建立了混凝土动力损伤模型.将动力损伤模型引入到随机损伤理论的框架内，建立了能够描述单调加载与反复加载条件下混凝土力学行为的一维随机动力损伤本构关系.基于实验结果，对模型进行了系统的验证.结果表明,模型能够较好地再现混凝土的典型非线性特性，包括软化、残余应变以及率敏感性，可以应用于实际结构的非线性全过程分析.

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.