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中文摘要：
借助连续介质力学理论，将损伤变量D引入强度理论，从理论上建立了混凝土材料因高温作用的损伤破坏准则，以反映材料内部状态的改变对混凝土材料强度的影响。计算值与文献试验值的对比结果证实了所提出的损伤破坏准则的合理性，同时也表明双轴强度极限线是逐渐萎缩的。
英文摘要：
Damage D was introduced into concrete strenth theory according to the theory of continuum, a damage failure criterion was established for concrete under high temperature through theoretical analysis. The dam_age failure criterion presented here can indicate the influence of damage evolution on the failure surface of concrete. Through the comparison between the theoretical data and testing data from some references, the results show that the failure surface of the biaxial concrete strength theory gradually shrinks with the increase of damage.
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