火灾后既有结构混凝土损伤评估的突变模型

为了充分考虑火灾后混凝土损伤的多种控制因素，简便而可靠的混凝土损伤综合评估方法，选取抗压强度、耐久性、爆裂和裂纹等4个损失系数为评价指标，采用突变理论的归一化公式和突变原则，构建火灾后混凝土损伤综合评估的突变模型，并予以工程实例分析。结果表明:该方法与模糊综合法、投影寻踪法、分形插值法、属性识别法、可拓物元法的评价结果具有较好的一致性，评价结果客观准确，是一种简单实用的火灾后混凝土损伤综合评估新方法。

Catastrophe model for assessment on concrete damage of post-fire existing structure

In order to fully consider various control factors of the post-fire concrete damage and develop a simple and reliable method to comprehensively assess concrete damage, four damage coefficients including compressive strength, durability, burst and crack were selected as the assessment indexes. A catastrophe model for comprehensive assessment on post-fire concrete damage was constructed by using the normalized formulas and catastrophe principles of catastrophe theory, and the engineering case analysis was conducted. The results showed that the evaluation result by this method has a good consistency with those by the fuzzy synthetic method, projection pursuit method, fractal interpolation method, attribute recognition method and extension matter-element method. The evaluation result is objective and accurate, which verifies that the model is a simple and practical new method to comprehensively assess the post-fire concrete damage.