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(1 同濟(jì)大學(xué)土木工程學(xué)院， 上海 200092；

2 悉尼大學(xué)土木工程學(xué)院, 悉尼 NSW2006;

3 同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室， 上海 200092; 4重慶大學(xué)土木工程學(xué)院, 重慶 400045)

［摘要］通過(guò)對(duì)現(xiàn)有組合梁抗火設(shè)計(jì)方法的總結(jié)和對(duì)比分析發(fā)現(xiàn)，中國(guó)規(guī)范和歐洲規(guī)范中承載力法在構(gòu)件溫度和承載力的計(jì)算上都基于相同的理論，只是某些參數(shù)的取值不同，最大的區(qū)別在于歐洲規(guī)范強(qiáng)調(diào)了對(duì)高溫下剪力連接件抗剪承載力的驗(yàn)算，中國(guó)規(guī)范則沒(méi)有考慮這一影響，而英國(guó)規(guī)范則基于試驗(yàn)研究的結(jié)果，給出了近似的計(jì)算公式。對(duì)于臨界溫度法，各規(guī)范均以表格或簡(jiǎn)化公式形式給出了臨界溫度計(jì)算方法，但只有英國(guó)規(guī)范考慮了常溫下抗剪連接程度的影響。通過(guò)將各規(guī)范計(jì)算結(jié)果與現(xiàn)有相關(guān)試驗(yàn)結(jié)果進(jìn)行對(duì)比發(fā)現(xiàn)，組合梁抗火設(shè)計(jì)時(shí)，應(yīng)考慮常溫下抗剪連接程度的影響；在現(xiàn)有中國(guó)規(guī)范組合梁抗火設(shè)計(jì)方法中考慮常溫下剪力連接程度后，能更準(zhǔn)確地預(yù)測(cè)組合梁的臨界溫度。

［關(guān)鍵詞］組合梁； 栓釘； 抗火設(shè)計(jì)； 剪力墻連接程度

中圖分類(lèi)號(hào)：TU3171，  TU973257文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2015)11-0070-05

Improvements of fire design specifications for composite beams

Chen Lingzhu1, 2， Li Guoqiang1,3， Jiang Shouchao1,3， Wang Weiyong4，   Ranzi Gianluca2

(1  College of Civil Engineering, Tongji University, Shanghai 200092, China；

2 The University of Sydney School of Civil Engineering, Sydney NSW2006, Australia;

3 State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;

4 School of Civil Engineering, Chongqing University, Chongqing 400045, China)

Abstract:Through summarizations and comparisons of current fire design methods for composite beams, both Chinese and European codes were found to be based on a similar theoretical approach called bearing capacity method for the evaluation of the moment capacity and its associated temperature field, with differences only related to the actual values assigned to a number of parameters. The biggest difference was that  Chinese code does not have a design check for the shear capacity of shear connectors at elevated temperatures but  European specifications do. And the approximate formula was provided based on test data in  British code. For the limiting temperature method, tables or simplified equations were suggested to obtain the limiting temperatures in Chinese, European and British codes, while the influence of the degree of shear connection at room temperature was included only in  British code. The importance in accounting for the influence of the degree of shear connection at room temperature in the fire design was highlighted from the comparisons carried out between calculated and measured test results. Based on these considerations, a suggestion for the Chinese code was presented to account for the shear capacity of shear connectors at elevated temperatures. The proposed method was shown to provide better prediction for the limiting temperatures of composite beams than the existing method in Chinese code.

Keywords:composite beam; shear stud; fire design； degree of shear connection

*土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放課題(SLDRCE-MB-05)。

作者簡(jiǎn)介：陳玲珠，博士研究生，Email: 2lingzhuchen@#edu.cn。

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