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界面过渡区对混凝土动态力学行为影响分析

DOI: 10.13197/j.eeev.2015.01.11.duxl.002, PP. 11-19

Keywords: 混凝土,细观尺度,加载速率,界面过渡区,动态力学行为

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Abstract:

混凝土宏观力学行为由其细观结构形式决定。考虑细观非均质性的影响,将混凝土看作由骨料、砂浆基质和界面过渡区组成的三相复合材料,其中骨料为弹性体,砂浆基质及界面过渡区的力学性能采用耦合材料应变率效应的塑性损伤本构模型来描述。为探讨界面过渡区对混凝土动态力学行为的影响,对不同加载速率下双边缺口混凝土试件的拉伸力学行为、混凝土梁弯拉破坏行为及混凝土试件单轴压缩力学行为进行了数值研究。数值结果表明当加载速率较小时,界面过渡区的力学性能对混凝土动态破坏模式和宏观力学性能有显著的影响;而当加载速率(名义应变率>50/s,如冲击载荷)很大时,混凝土动态破坏模式基本不受界面过渡区力学性能的影响。

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