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工程中通常需要对遭受火灾而未倒塌的混凝土结构进行安全评价,以确定其损伤程度,为结构的拆除或加固提供可靠依据。结构外表面和内部曾受到的受火温度是火灾后混凝土结构安全评估研究中关注的关键问题,也是其是否安全的判定准则之一。该文基于静态测量数据的参数识别方法,利用混凝土受火逐层损伤的特性以及火灾后力学参数与温度的对应关系,建立了估计火灾后混凝土结构内的温度梯度分布的反演格式和算法。最后通过数值算例验证了该方法的可行性和准确性。
In the project, it is usually necessary to evaluate the safety of concrete structures that have suffered a fire without collapse, so as to determine the degree of damage and provide a reliable basis for the demolition or reinforcement of structures. The temperature of the fire exposed to the outside of the structure and the inside of the structure is one of the key issues concerned in the safety evaluation of concrete structures after a fire and one of the criteria for determining whether it is safe or not. Based on the method of parameter identification of static measurement data, the inversion format and algorithm for estimating the temperature gradient distribution in concrete structures after fire are established by using the characteristics of concrete damaged by fire and the corresponding relationship between mechanical parameters and temperature after fire. Finally, a numerical example is given to verify the feasibility and accuracy of the proposed method.