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Analysis of damage characteristics of concrete under dynamic uniaxial compression based on improved Najar energy method
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摘要: Najar能量法定义了损伤耗散能和无损应变能，并通过两者的比值确定了混凝土单轴受压情况下的损伤变量。该方法原理清晰，但不能在宏观上很好地描述混凝土单轴受压破坏的实际过程。针对此问题改进了Najar能量法，将混凝土受压过程中的弹性变形和塑性变形剥离开来，定义了一个新的损伤变量。为了对比分析改进前后的方法，进行了不同加载速率下的混凝土单轴压缩试验，并对试验数据加以拟合。以拟合后的试验数据为基础，分别利用改进前后的两种方法计算了混凝土受压过程中损伤变量，得到了改进前后损伤变量随应变变化的关系曲线。对比分析发现，改进后的Najar能量法在计算上更为简便，而且在宏观上更符合混凝土单轴受压的一般破坏规律。同时，这一关系曲线也反映了混凝土材料的应变率效应。Abstract: Najar energy method defines damage dissipation energy and nondestructive strain energy, and the ratio of those two is defined as the damage variable. The principle of the method is clear, but the method can't well describe the actual process of concrete uniaxial compression failure. In this paper, this method is improved, the delamination of elastic deformation and plastic deformation in the process of concrete compressiona is done, and a new damage variable is defined. In order to make a comparison between those two methods, the uniaxial compression tests of concrete under different loading rates are carried out, and the experimental data are fitted. Based on the fitted data, the damage variables in the compression process of concrete are calculated by those two methods, and the relationship curves between the damage variables and strain are obtained from the experimental studies. It is found from the experimental studies that the improved Najar energy method is more simple and more convenient than the conventinoal methods, and it is also more conformable to the general failure law of concrete under the uniaxial compression. At the same time, the relationship curves also reflect the strain rate effects of concrete.
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Keywords:
- concrete /
- uniaxial compression /
- damage characteristics /
- Najar energy method
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期刊类型引用(7)
1. 任青文，殷亚娟，顾嘉丰. 基于修正耗散能的水工混凝土损伤分析. 水利学报. 2024(10): 1199-1209 . 
百度学术
2. 王普，陈灯红，彭刚，王乾峰. 基于能量法的混凝土循环加卸载动态损伤特性. 水利水电技术. 2020(02): 192-197 . 百度学术
3. 吴聪，彭刚. 冻融劣化混凝土动态轴压弹塑性损伤研究. 西安理工大学学报. 2019(01): 102-108 . 百度学术
4. 王普，彭刚，刘苗苗，孙尚鹏，程卓群. 基于能量法的混凝土双轴动态受压损伤特性研究. 工业建筑. 2019(05): 98-102 . 百度学术
5. 李忠友，姚志华，胡柏. 基于能量耗散特征的脆性岩土材料三轴压缩损伤模型. 建筑科学与工程学报. 2019(04): 80-86 . 百度学术
6. 程卓群，彭刚，孙尚鹏，王普，刘苗苗. 基于Najar能量法的混凝土动态双轴受压损伤特性分析. 水利水运工程学报. 2019(04): 100-106 . 本站查看
7. 肖洋，彭刚，黄超，罗曦，彭竹君. 压剪共同作用下混凝土的损伤演化研究. 水利水运工程学报. 2018(02): 112-119 . 本站查看
其他类型引用(8)
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