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工程力学  2015 

混凝土循环加卸载动态损伤特性研究

DOI: 10.6052/j.issn.1000-4750.2013.12.1152, PP. 141-145

Keywords: 混凝土,循环加卸载,刚度退化,损伤,本构模型

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Abstract:

利用大型多功能动静力三轴仪对混凝土试件进行了5种应变速率下的动态循环加卸载压缩试验。对混凝土的物理力学参数的变化规律进行了统计分析。结果表明:峰值应力和弹性模量随加载速率的提高而增大,但峰值应变随加载速率的变化表现出较大的离散性。在此基础上,进一步研究了混凝土在不同加载速率下的刚度退化规律。最后,选用基于Weibull统计理论的分段式动态损伤本构模型对试验数据进行拟合。经验证,此模型能够较好的模拟混凝土材料的本构特性。

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