火灾后混凝土构件的剩余刚度估计  

ESTIMATION OF THE RESIDUAL STIFFNESSES OF FIRE-DAMAGED CONCRETER MEMBERS

作　　者：朱建明[1] 王晓纯[1] 魏东[2] 刘应华[2] 

机构地区：[1]北方工业大学建筑工程学院,北京100144 [2]清华大学航天航空学院工程力学系,北京100084

出　　处：《工程力学》2011年第8期193-197,207,共6页Engineering Mechanics

基　　金：国家重点基础研究专项基金项目(2001CB409603)

摘　　要：火灾后混凝土构件的剩余刚度是混凝土结构变形性能和抗震分析的重要指标,也是火灾后混凝土构件修复和加固的重要依据之一。该文基于等效弹性模量法、改进分段模型法以及参数反演法方法等计算了标准火灾作用后混凝土构件的剩余刚度,分析了受火时间、含钢率和截面尺寸等因素对剩余刚度的影响规律。计算表明该文发展的三种方法可以方便有效地计算火灾作用后混凝土构件的剩余刚度,这些估计方法及其所得结果可供有关混凝土结构工程设计时参考。The residual stiffness of concrete after exposure to fire is a very important issue for the load-carrying capacity assessment and seismic analysis of fire-damaged concrete structures. It is also one of the most important criterions of repairing and reinforcing fire-damaged concrete structures. Based on the equivalent elastic modulus method, improved sub-section model method and inverse method developed in this paper, the residual stiffness of fire-damaged concrete members are estimated. The effects of fire duration time, steel ratio and sectional dimensions on the stiffness are presented in detail. The results of examples show that the three methods developed in this paper can accurately and conveniently estimate the residual stiffness of fire-damaged concrete members.

关 键 词：火灾 混凝土结构 剩余刚度 等效弹性模量法 改进分段模型法 参数反演法 

分 类 号：TU312[建筑科学—结构工程]