冷彎薄壁卷邊槽鋼檁條彎曲變形的抗彎剛度*
孫德發(fā)1,2
- 摘 要
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（1 嘉興學(xué)院結(jié)構(gòu)工程研究所，嘉興 314001；2 萊比錫應(yīng)用技術(shù)大學(xué)建筑工程學(xué)院，萊比錫 04251）［摘要］在分析比較歐洲規(guī)范EN 1993-1-3和我國《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》（GB 50018—2002）的基礎(chǔ)上，針對冷彎薄壁卷邊槽鋼檁條彎曲變形的抗彎剛度進(jìn)行了較深入的探討和對比分析。計(jì)算結(jié)果表明：按《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》（GB 50018—2002）計(jì)算有效截面抗彎剛度相對保守，按毛截面計(jì)算抗彎剛度稍顯不安全，按EN 1993-1-3計(jì)算相對合理。在滿應(yīng)力狀況下，對于2mm厚C140～C250規(guī)格的冷彎薄壁卷邊槽鋼檁條，在正常使用極限狀態(tài)下，抗彎剛度折減系數(shù)可取毛截面抗彎剛度的0.95倍（Q235鋼）和0.9倍（Q345鋼）。［關(guān)鍵詞］冷彎薄壁卷邊槽鋼; 檁條; 有效截面; 彎曲變形; 抗彎剛度中圖分類號(hào)：TU392.5 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2014)21-0013-04Bending rigidity of cold-formed thin-wall lipped channel purlins for bending deflectionSun Defa1,2(1 Institute of Structural Engineering, Jiaxing University, Jiaxing 314001, China; 2 Faculty of Civil Engineering and Architecture, Leipzig University of Applied Sciences, Leipzig 04251, Germany)Abstract: Based on the comparison analysis of Eurocode EN 1993-1-3 and Technical code of cold-formed thin-wall steel structure (GB 50018—2002) in China, intensive study and comparison analysis were carried out about the bending rigidity of cold-formed thin-wall lipped channel purlins for bending deflection. The calculating results show that the provisions in the GB 50018—2002 specifications are too conservative about the effective section bending rigidity and the bending rigidity calculated according to gross cross-section is unsafe, while the results are reasonable according to the EN 1993-1-3. Under the full stress condition, the reduction factor for the bending rigidity of cold-formed thin-wall lipped channel purlins from C140 to C250 (thickness of 2mm) are 0.95 times (Q235 steel) and 0.9 times (Q345 steel) of the gross crosssection bending rigidity respectively at the serviceability limit state.Keywords: cold-formed thin-wall lipped channel; purlin; effective cross-section; bending deflection; bending rigidity* 浙江省重點(diǎn)科技創(chuàng)新團(tuán)隊(duì)項(xiàng)目（2012R1002206）,浙江省本科院校中青年學(xué)科帶頭人學(xué)術(shù)攀登項(xiàng)目（pd2013309）。作者簡介：孫德發(fā)，博士，副教授，Email：sdf@mail.zjxu.edu.cn。參考文獻(xiàn)［1］CECS 102∶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(jì)劃出版社，2003.［2］GB 50018—2002冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范［S］.北京：中國計(jì)劃出版社，2002.［3］EN 1993-1-3∶2006-Eurocode 3: design of steel structure, part 1-3: general rules, supplementary rules for cold-formed thin gauge members and sheeting［Ｓ］．Brussels: European Committee for Strandardization,2006.［4］苗二萍，劉小峰，彭奕亮. 冷彎薄壁C形鋼梁彎曲變形分析［J］.建筑結(jié)構(gòu)，2010，40（2）：56-58.［5］DAN DUBINA, VIOREL UNGUREANU, RAFFAELE LANDOLFO. Design of coldformed steel structures［M］. Portugal： ECCS-European Convention for Constructional Steelwork,2012.［6］張耀春，王海明. 冷彎薄壁型鋼C形截面構(gòu)件受彎承載力試驗(yàn)研究［J］.建筑結(jié)構(gòu)學(xué)報(bào)，2009，30（3）：53-61.［7］王海明，張耀春. 冷彎型鋼C形截面受彎構(gòu)件平面內(nèi)穩(wěn)定性能研究［J］.建筑結(jié)構(gòu)，2009，39（4）：87-91.［8］GB 50017—2003 鋼結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］.北京：中國計(jì)劃出版社，2003.
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