圆形钢管混凝土柱中钢-混凝土界面接触热阻的理论分析*

张江彬1，徐赵东1，韩金生2，李 杰3（1 东南大学土木工程学院，南京 210096； 2 山东科技大学，青岛 266510；3 中铁二十四局，上海 200070）

［摘要］目前现有不多的计算受火条件下钢-混凝土组合结构温度场方法中，一个主要的不足是忽略了钢与混凝土界面处接触热阻的影响，这将对钢-混凝土组合结构温度场的精确分析、高温下结构（构件）的力学性能以及结构（构件）耐火极限的精确分析产生一定程度的影响。采用综合考虑钢材和混凝土热物理参数的方法进行分析推导，通过求解热传导方程导出了圆形钢管混凝土柱中钢管内壁与核心混凝土间接触热阻的数学表达式。研究为进一步精确分析高温下钢管混凝土柱的力学性能及耐火极限提供了一种新的方法。

［关键词］钢管混凝土柱；热传导；接触热阻；界面

中图分类号：TU398.7文献标识码：A文章编号：1002-848X(2011)01-0030-05

Theoretical analysis on thermal contact resistance at steel-concrete interface of concrete filled-steel tubes

Zhang Jiangbin1, Xu Zhaodong1, Han Jinsheng2, Li Jie3

(1 Civil Engineering College, Southeast University, Nanjing 210096, China; 2 Shandong University of

 Science and Technology, Qingdao 266510, China; 3 China Railway 24 Bureau Group, Shanghai 200070, China)

Abstract:Among the existed methods to predict temperature field of steel-concrete composite structures under fire conditions, one of the drawbacks  is ignoring the effect of thermal contact resistance at the steel-concrete interface. It would have a great influence on the accurate analysis of temperature field, behaviors and fire resistance of steel-concrete composite structures (members) under high temperature. The method of comprehensively considering the thermophysical parameters of steel and concrete has been used to analysis and deduct. The mathematical expression of thermal contact resistance at the steel-concrete interface of circular concrete filled steel tube was derived through solving heat conduction equations. The work provides a new method for the further accurate analysis of the behaviors and fire resistance of concrete filled steel tubes.

Keywords:concrete filled steel tubes; heat conduction; thermal contact resistance; interface

建设部研究开发项目(2008-K3-6)，教育部新世纪优秀人才支持计划，江苏省333高层次人才支持计划。

作者简介：张江彬，硕士，Email:zhangjb8020@163.com。

参考文献

［1］UY B. Behaviour and design of thin-walled concrete-filled steel box columns［J］. Australian Civil/Structural Engineering Transactions,1996,CE39(1):31-38.

［2］李国强,韩林海.钢结构及钢-混凝土组合结构抗火设计［M］.北京:中国建筑工业出版社,2006.

［3］LIE T T,DENHAM. Factors affecting the fire resistance of circular hollow steel columns filled with bar-reinforced               concrete［R］.NRC-CNRC Internal Report,1993:651.

［4］章熙民,任泽霈,梅飞鸣.传热学［M］.北京:中国建筑工业出版社, 2001.

［5］MONDE M,ARIMA H,MITSUTAKE Y. Estimation of surface temperature and heat flux using inverse solution for one-dimensional heat conduction［J］.Journal of Heat Transfer, 2003:213-223.

［6］GERALD B F.Fourier analysis and its applications［M］.Beijing:China Machine Press,2005.

［7］GHOJEL J. Experimental and analytical technique for estimating interface thermal conductance in composite structural elements under simulated fire conditions［J］. Experimental Thermal and Fluid Science,2004(28):347-354.

［8］LIE T T, CHABOT M. A method to predict the fire resistance of circular concrete-filled hollow steel columns［J］. Journal of Fire Protection Engineering,1999(51):21-36.

［9］韩林海.钢管混凝土在高温作用下温度场的非线性有限元分析［J］.哈尔滨建筑大学学报,1997（4）:16-22.

［10］韩金生.配筋钢管混凝土柱抗火性能的试验研究［D］.南京:东南大学,2006.

［11］DG/TJ08—008—2000建筑钢结构防火技术规程［S］.上海，2000.

［12］JGJ99—98高层民用建筑钢结构技术规程［S］.北京：中国建筑工业出版社,1998.