考虑多轴应力状态影响的二维混凝土损伤模型
首发时间:2012-11-23
摘要:本文基于龙渝川和李正良提出的混凝土损伤模型,引入屈服函数模拟多轴应力状态对混凝土强度和损伤演化规律的影响,建立了改进的二维损伤本构模型。随后,本文应用该损伤模型对Kupfer双向受压试验进行了仿真分析。仿真结果显示,采用本文损伤模型计算得到了与试验可比的应力-应变响应,其中峰值荷载计算值与试验结果吻合程度高,反映出双轴受压应力状态导致的混凝土强度增高;同时,除单轴加载情况外,计算得到的应变响应与试验结果存在差异,这一差异随峰值荷载的升高而增大。数值算例表明,本文损伤模型能够模拟混凝土在双轴受压加载下的损伤行为,但模型宜引入塑性流动法则,建立新的损伤-塑性耦合模型,以改进多轴应力状态下混凝土不可恢复变形的演化规律。
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The two-dimensional damage model considering multi-axial stress
Abstract:An two-dimensional damage model accounting for the effect of multi-axial stress state is developed by embedding the yielding function into the damage model proposed by Long Yuchuan and Li Zhengliang. This model is applied to the simulation of Kupfer's concrete test under biaxial stress. The results show that the calculated stress/strain relation is comparable to the experimental one. The peak load obtained with the damage model is consistant with that obtained by the test and the compressive strength under biaxial stress is higher than that under uniaxial one. However, the numercial strain response is different with the experimental one because the evolutive rule of irrecoverable strain used herein is obtained under uniaxial stress. The results indicate that the damage model is applicable to simulate the damage behavoir of concrete under multi-axial stress and a new plastic-damage model should be developed based on the plastic flow theory to account for the influence of multi-axial stress on the evolution of irrecoverable strain.
Keywords: concrete damage and fracture damage model numerical simulation
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