中文摘要：

将混凝土模型化为非饱和变形多孔多相介质。基于控制干空气、湿份及基质溶解物的质量守恒、混凝土介质混合体的动量守恒和焓（能量）守恒的耦合偏微分方程组,建立了一个混凝土化学-热-湿-力全耦合数学模型,其中基本未知变量为固相位移、混合气体压力、毛细压力、温度和基质溶解物质量。通过数值预测结果与试验测量结果的定量比较,显示出所发展的数学模型在重现高温条件下混凝土中化学-热-湿-力耦合现象的能力。

英文摘要：

The concretes are modeled as unsaturated deforming reactive porous media in this paper.A coupled chemo-thermo-hygro-mechanical model for concrete exposed to high temperatures is presented.The mathematical model consists of a set of coupled,partial differential equations governing the mass balance of the dry air,the mass balance of the water species,the mass balance of the matrix components dissolved in the liquid phases,the enthalpy（energy）balance and momentum balance of the whole medium mixture.The solid displacements,gas pressure,capillary pres-sure,temperature and the mass of the matrix components dissolved in the liquid phases are taken as primary unknowns of the model.Quantitative comparison of experimental and simulated results shows the capability of the proposed FE model in reproducing coupled chemo-thermo-hy-gro-mechanical phenomena in concretes at high temperatures.