基于静态参数识别的火灾后混凝土结构受火温度估计  

ESTIMATION OF THE TEMPERATURE DISTRIBUTION IN CONCRETER STRUCTURES AFTER FIRE BY STATIC PARAMETER IDENTIFICATION

作　　者：魏东[1] 刘应华[1] 向志海[1] 

机构地区：[1]清华大学航天航空学院工程力学系,北京100084

出　　处：《工程力学》2010年第1期148-153,共6页Engineering Mechanics

基　　金：国家重点基础研究专项基金项目(2001CB409603)

摘　　要：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 order to provide the credible decisions to remove or reinforce the concrete structures suffered fire damage, the safety assessments are needed to analyze their residual load-carrying capacities and service performances. The maximal temperature distribution in concrete structures is one of the most crucial parameters of the structural damage identification and safety assessment due to the close relationship between temperature and material performances. The inverse method is proposed in this paper to estimate the temperature based on the static parameter identification. Finally, compared with test observations, numerical results show that the present study provides a feasible method to predict the temperature gradient, which is important for the safety assessment of concrete structures after fire.

关 键 词：火灾 参数识别 受火温度 混凝土结构 安全评价 

分 类 号：TU311.2[建筑科学—结构工程]