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圓形鋼管混凝土柱中鋼-混凝土界面接觸熱阻的理論分析*

張江彬1，徐趙東1，韓金生2，李 杰3（1 東南大學(xué)土木工程學(xué)院，南京 210096； 2 山東科技大學(xué)，青島 266510；3 中鐵二十四局，上海 200070）

［摘要］目前現(xiàn)有不多的計(jì)算受火條件下鋼-混凝土組合結(jié)構(gòu)溫度場方法中，一個主要的不足是忽略了鋼與混凝土界面處接觸熱阻的影響，這將對鋼-混凝土組合結(jié)構(gòu)溫度場的精確分析、高溫下結(jié)構(gòu)（構(gòu)件）的力學(xué)性能以及結(jié)構(gòu)（構(gòu)件）耐火極限的精確分析產(chǎn)生一定程度的影響。采用綜合考慮鋼材和混凝土熱物理參數(shù)的方法進(jìn)行分析推導(dǎo)，通過求解熱傳導(dǎo)方程導(dǎo)出了圓形鋼管混凝土柱中鋼管內(nèi)壁與核心混凝土間接觸熱阻的數(shù)學(xué)表達(dá)式。研究為進(jìn)一步精確分析高溫下鋼管混凝土柱的力學(xué)性能及耐火極限提供了一種新的方法。

［關(guān)鍵詞］鋼管混凝土柱；熱傳導(dǎo)；接觸熱阻；界面

中圖分類號：TU398.7文獻(xiàn)標(biāo)識碼：A文章編號：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

建設(shè)部研究開發(fā)項(xiàng)目(2008-K3-6)，教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃，江蘇省333高層次人才支持計(jì)劃。

作者簡介：張江彬，碩士，Email:zhangjb8020@163.com。

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