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Analysis of dynamic biaxial compression damage characteristics of concrete based on Najar energy method
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摘要: 利用动静力三轴试验机进行不同加载速率、不同侧向压力下混凝土的抗压试验，基于改进的Najar能量法，提出一种新的损伤变量计算方法，以此分析侧向压力和加载速率对混凝土双轴受压状态下损伤演化的影响。研究结果表明：①峰值应力随加载速率的增大而增大；相同加载速率下，峰值应力随侧压力增大而增大，混凝土达到峰值应力后承载力下降趋势不受侧压影响；②混凝土双轴受压状态下损伤演化可分为线弹性阶段、损伤加速变化阶段和损伤收敛阶段；③加载速率越大，损伤加速发展阶段损伤变量的增长越迅速且该阶段对应的应变范围越小；④侧向压力对混凝土损伤演化有明显影响，混凝土损伤的发展随着侧应力的增大而出现滞后现象。Abstract: The compression tests of concrete under different lateral pressures and different loading rates are carried out by using a dynamic and static triaxial testing machine. Based on the improved Najar energy method, a new calculation method for damage variables is proposed to analyze the influences of the lateral pressures and loading rates on the damage evolution of concrete under biaxial compression stress. The analysis results show that:(1) The peak stress increases with the increase of the loading rates. Under the same loading rates, the peak stress increases with the increase of the lateral pressures. When the concrete reaches the peak stress, the decreasing trend of the bearing capacity is not affected by lateral pressures. (2) The damage evolution of concrete under biaxial compressive stress state can be divided into three stages: the elastic stage, the damage acceleration stage and the damage convergence stage. (3) The higher the loading rate is, the faster the damage variable increases in the accelerated development stage and the smaller the strain range in this stage. (4) The lateral pressure has a significant influence on the damage evolution of concrete. The development of concrete damage lags with the increase of the lateral stresses.
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Key words:
- concrete /
- Najar energy method /
- strain rate /
- biaxial compression /
- damage
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图 1 混凝土动态单轴受压应力-应变曲线
Figure 1. Dynamic uniaxial compression stress-strain curves of concrete
图 2 不同加载速率下的双轴受压应力-应变曲线
Figure 2. Stress-strain curves of biaxial compression under different loading rates
图 5 不同加载速率下单轴受压的刚度退化曲线
Figure 5. Stiffness degradation curves of concrete under different loading rates
图 6 不同侧压下双轴受压刚度退化曲线
Figure 6. Stiffness degradation curves of concrete under different lateral pressures
图 8 修正后的单轴受压损伤演化
Figure 8. Corrected uniaxial compression damage evolution of concrete
图 9 不同应变速率下单轴受压的损伤演化曲线
Figure 9. Damage evolution curves of uniaxial compression under different loading rates
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