混凝土热-力耦合作用的细观模拟方法
Meso-scale approach to modeling concrete subjected to thermo-mechanical loading
摘要：
混凝土承受组合的压缩应力和温度荷载时，其压缩应变比混凝土单独承受压缩应力时要大得多。这种现象被称为瞬态热蠕变或负载引起的热应变，通常是由宏观唯象本构关系，只有有限的预测能力建模。在本研究中，提出了一种介观尺度的建模方法，其中宏观上观察到的瞬态热蠕变的结果从不匹配的热膨胀的介观尺度成分。混凝土的细观结构被理想化为由骨料、基体和界面过渡区组成的二维三相材料。各相的非线性材料响应采用损伤-塑性界面模型描述。采用细观尺度方法对均匀温度历史作用下的混凝土受压试件进行了分析，并将分析结果与文献报道的试验结果进行了比较。
英文摘要：
Concrete subjected to combined compressive stresses and temperature loading exhibits compressive strains, which are considerably greater than for concrete subjected to compressive stresses alone. This phenomenon is called transient thermal creep or load induced thermal strain and is usually modeled by macroscopic phenomenological constitutive laws which have only limited predictive capabilities. In the present study a meso-scale modeling approach is proposed in which the macroscopically observed transient thermal creep results from the mismatch of thermal expansions of the meso-scale constituents. The meso-structure of concrete is idealized as a two-dimensional three phase material consisting of aggregates, matrix and interfacial transition zones (ITZ). The nonlinear material response of the phases are described by a damage-plasticity interface model. The meso-scale approach was applied to analyze compressed concrete specimens subjected to uniform temperature histories and the analysis results were compared to experimental results reported in the literature.
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