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(1 同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家實(shí)驗(yàn)室，上海 200092； 2 重慶大學(xué)土木工程學(xué)院，重慶 400045； 3 上海江歡成建筑設(shè)計(jì)有限公司，上海 200002)

［摘要］根據(jù)現(xiàn)行《建筑鋼結(jié)構(gòu)防火技術(shù)規(guī)范》(CECS200：2006)中簡(jiǎn)支組合梁抗火承載力驗(yàn)算方法，提出了簡(jiǎn)支組合梁抗火設(shè)計(jì)的臨界溫度法，給出了臨界溫度的計(jì)算方法。對(duì)影響簡(jiǎn)支組合梁臨界溫度的參數(shù)分析研究發(fā)現(xiàn)：在確定的荷載比下簡(jiǎn)支組合梁的鋼梁截面、材料強(qiáng)度、有效寬度等對(duì)簡(jiǎn)支組合梁的臨界溫度的影響較小，而耐火極限和樓板厚度對(duì)簡(jiǎn)支組合梁臨界溫度影響較大。給出了一般簡(jiǎn)支組合梁在不同樓板厚度、不同耐火極限下，不同荷載比對(duì)應(yīng)的臨界溫度，可供工程設(shè)計(jì)使用。

［關(guān)鍵詞］簡(jiǎn)支組合梁；荷載比；臨界溫度；耐火極限

Simplified approach for fire-resistance design of simple-supported composite beams

Li Guoqiang¹, Wang Weiyong², Zhou Hongyu³(1 School of Civil Engineering, Tongji University, Shanghai 200092, China; 2 School of Civil Engineering, Chongqing University, Chongqing 400045, China; 3 JIANGS Architects & Engineers, Shanghai 200041, China)

Abstract:Based on the fire resistance validation method in current Technical Code on Fire safety of Steel Structure, critical temperature method for fire resistance design of composite beams is proposed. The calculation method of critical temperature is presented. Parameters affecting the critical temperature are analysed. The results show that at a definite load level, section shape of steel beams, material properties and effective width have little influence on the critical temperature of simple-supported composite beams. However, the fire duration and depth of slabs have significant influence on the critical temperature. The critical temperature of normal simple-supported composite beams, at various slab depth and fire duration, is given to provide a reference for engineering.

Keywords:simple-supported composite beams; load level; critical temperature; fire duration

作者簡(jiǎn)介：李國(guó)強(qiáng)(1963-)，教授，博導(dǎo)，Email:gqli@#edu.cn。

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