薄腹工字形截面軸壓構(gòu)件有效面積計算方法比較*
姚行友1，李元齊1，沈祖炎1，申林2
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（1 同濟大學建筑工程系，上海 200092； 2 中國建筑標準設(shè)計研究院，北京 100048）［摘要］對各國規(guī)范以及Winter公式關(guān)于工字形截面構(gòu)件有效寬度的計算公式進行簡要介紹，并采用各國規(guī)范方法和有限元數(shù)值模擬對腹板不同寬厚比和構(gòu)件不同長細比的工字形截面軸壓構(gòu)件有效面積進行計算和分析。結(jié)果表明：《門式剛架輕型房屋鋼結(jié)構(gòu)技術(shù)規(guī)程》（CECS102:2002）在腹板寬厚比較大時有效面積過于保守，《鋼結(jié)構(gòu)設(shè)計規(guī)范》（GB50017—2003）、歐洲規(guī)范（E3-1.5:2006）對于長細比較大構(gòu)件有效面積過于保守，《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》（GB50018—2002）、美國規(guī)范（AISC:2005）以及Winter公式與數(shù)值結(jié)果吻合較好，且有一定的安全度，建議對于薄腹工字形截面軸壓構(gòu)件有效面積可采用《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》（GB50018—2002）計算方法進行計算。［關(guān)鍵詞］門式剛架；工字形截面；屈曲后強度；有效面積中圖分類號：TU3921文獻標識碼：A文章編號：1002-848X(2011)08-0075-04Comparative investigation on estimation methods for effective area of thin-webbed I-shaped members under axial compressionYao Xingyou1, Li Yuanqi1, Shen Zuyan1, Shen Lin2（1 Department of Building Engineering, Tongji University, Shanghai 200092, China；2 China Institute of Building Standard Design and Research, Beijing 100048, China)Abstract:Estimation methods of effective width recommended by the codes of some countries and Winter equation were introduced. The effective area of thin-webbed I-shaped members with different width-thickness ratio in web and slenderness ratio were estimated using these codes and finite element method. The results show that Technical specification for steel structure of light-weight buildings with gabled frames(CECS102：2002) is too conservative for members with large width-thickness ratio, while Code for design of steel structures (GB50017—2003) and European specification (E3-15:2006) are too conservative for members with large slenderness ratio. Technical code of cold-formed thin-wall steel structures(GB50018—2002), America specification (AISC: 2005) and Winter equation are close to the numerical results with a certain safety. Therefore, Technical code of cold-formed thin-wall steel structures(GB50018—2002) can be used to estimate the effective area of thin-webbed I-shaped members.Keywords:gabled frame; I-shaped section; post-buckling strength; effective area*國家科技支撐計劃項目（2006BAJ04A02-04）。作者簡介：姚行友，博士研究生，一級注冊結(jié)構(gòu)工程師，Email: yaoxingyoujd@163.com。參考文獻［1］CECS102：2002 門式剛架輕型房屋鋼結(jié)構(gòu)技術(shù)規(guī)程［S］. 北京:中國計劃出版社,2002.［2］GB50017—2003 鋼結(jié)構(gòu)設(shè)計規(guī)范［S］. 北京:中國計劃出版社,2003.［3］GB50018—2002 冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范［S］.北京:中國計劃出版社,2002.［4］AISC:2005 Specification for structural steel buildings［S］.Chicago: American institute of steel construction, Inc., 2005.［5］E3:1-5:2006 Design of steel structures［S］. UK: BSI, 2006.［6］YU W W. Cold-formed steel design［M］. 3rd edition. American: John Wiley, Sons, Inc., 2000.［7］沈祖炎, 李元齊, 王磊,等. 屈服強度550MPa高強鋼材冷彎薄壁型鋼結(jié)構(gòu)可靠度分析［J］. 建筑結(jié)構(gòu)學報, 2006, 27(3):26-34.
