基于残余位移的空间结构火灾温度场推定方法  

Inverse presumption method for temperature fields of spatial structure based on residual displacement

作　　者：崔璟[1] 尹凌峰[1] 郭小明[1] 唐敢[2] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]南京航空航天大学土木工程系,江苏南京210016

出　　处：《浙江大学学报（工学版）》2016年第4期720-726,共7页Journal of Zhejiang University：Engineering Science

基　　金：江苏省高校优势学科建设工程资助项目(1105007001);江苏省普通高校研究生科研创新计划资助项目(CXLX12_0076)

摘　　要：针对火灾下结构温度场的反演问题,提出基于火灾后结构残余位移的温度场逆向推定方法,以有限元位移解与实测位移的差值为优化目标函数,选取合适的权函数构造火灾后的结构温度场逆向推定算法,通过温度场迭代计算定量得到结构经历的最高温度场分布,为科学评估火灾后的钢结构残余性能和结构修复加固提供理论依据.设计Williams双杆火灾试验,对比试验数据和逆向推定结果表明,温度场逆向推定方法是可行的,具有较高的精度.A temperature inversion presumption method was developed based on post-fire structure residual deformations according to the inverse problem for temperature field of spatial structure exposed to fire.The difference between measured and finite element method values was made as optimization object function.An inverse algorithm was constructed by selecting an eligible weight function.The temperature field distribution was obtained by iterative calculation.A theoretical basis for scientificly evaluating the residual performances of post-fire structure and formulating reliable repair and reinforcement schemes was provided.Williams toggle frames for fire experiment were designed.The collected test data was compared with the presumption results.The method is feasible and the results have enough accuracy.

关 键 词：火灾后 残余位移 逆向推定方法 温度场 

分 类 号：TU311[建筑科学—结构工程]