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| Microplane modeling of ASR effects on concrete structures |
| DUAN An1, ZHANG Da wei1, ALNAGGAR Mohammed2 |
| 1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;2. Department of Civil and Environmental Engineering, Northwestern University, Evanston 60208, USA |
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Abstract A modified microplane model was developed to simulate the alkali silica reaction (ASR) damage based on the latest version of microplane theory M7 in order to accurately modeling the complicated behavior of concrete structures subjected to ASR. The material damage caused by the volume expansion of ASR gel was modeled in M7 as a reduction of material stiffness and boundaries. A stress effect function was proposed to depend on the normal stress of the microplane in order to consider the modification of ASR expansions due to applied stresses. The explicit algorithm for the model was established and implemented into commercial software ABAQUS. Finite element analysis of the ASR effect on laboratory specimens was conducted. The analytical results accorded with the experimental data. The validity of the proposed model was illustrated.
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Published: 29 October 2015
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微平面模型模拟ASR作用下混凝土力学行为
为了准确模拟发生碱 硅酸反应(ASR)的混凝土结构的复杂受力行为,在最新一代微平面理论的基础上,提出适于分析ASR作用下混凝土力学行为的微平面模型.修改了微平面应力边界和法向模量表达式,引入应力效应函数来模拟应力对ASR膨胀应变的影响.开发相应的动力显式算法,完成了该算法在有限元程序ABAQUS中的集成.对ASR作用下的混凝土试件力学性能和变形试验进行模拟可知,计算值与试验值吻合良好,验证了该模型的有效性.
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