冷彎薄壁方鋼管長(zhǎng)柱軸壓與偏壓性能研究*
褚云朋，姚勇，鄧勇軍，肖術(shù)連
- 摘 要
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（西南科技大學(xué)土木工程與建筑學(xué)院， 綿陽(yáng) 621010）［摘要］進(jìn)行了9組共18個(gè)冷彎薄壁方鋼管受壓長(zhǎng)柱試件的試驗(yàn)研究，考慮了長(zhǎng)細(xì)比、偏心距兩個(gè)變化參數(shù)，得到了試件的破壞形態(tài)、荷載-位移曲線以及承載力等重要數(shù)據(jù)，并采用有限元方法進(jìn)行了數(shù)值模擬計(jì)算。結(jié)果表明：1）對(duì)于軸心受壓柱，在長(zhǎng)細(xì)比λ≤36.4時(shí)，柱發(fā)生強(qiáng)度破壞，承載力較高；對(duì)于受壓偏心距較大的柱，發(fā)生屈曲破壞，且發(fā)生局部屈曲后在持荷下迅速喪失承載能力。2）偏心距對(duì)受壓構(gòu)件極限承載力影響很大，在長(zhǎng)細(xì)比λ≥29.1時(shí)，極限承載力隨偏心距增加而迅速降低；建議在長(zhǎng)細(xì)比λ≥58.2時(shí)，受壓柱需加支撐以減小計(jì)算長(zhǎng)度，提高極限承載力。3）有限元計(jì)算結(jié)果與試驗(yàn)結(jié)果較為接近，差值在12%以內(nèi)，具有一定準(zhǔn)確度。［關(guān)鍵詞］冷彎薄壁方鋼管柱; 試驗(yàn)研究; 有限元分析; 屈曲性能中圖分類號(hào)：TU392.1 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)21-0018-05Research on behavior of cold-formed thin-walled long square steel tube columns under concentrically and eccentrically compressive loadsChu Yunpeng, Yao Yong, Deng Yongjun, Xiao Shulian(College of Civil Engineering, Southwest University of Technology, Mianyang 621010, China)Abstract: Tests of 18 specimens (9 groups) of cold-formed thin-walled square steel tube long columns under compressive loads were carried out. Slenderness ratio and the eccentricity of the specimens were considered and the data of failure mode, load-displacement curve as well as the bearing capacity of every specimen were obtained. Numerical simulation was carried out using finite element analysis method. Results show that: 1）columns under concentrically compressive loads with the slenderness ratio less than 36.4 occur strength failure with high bearing capacity; for specimens under eccentrically compressive loads, their carrying capacity decrease dramatically when columns occur buckling or local buckling failure. 2）Eccentricity has great influence on ultimate bearing capacity of compression members and their ultimate bearing capacity sharply reduce in reverse proportion to eccentricity when slenderness ratio is greater than 29.1. Braces between compression members are needed to add to reduce the calculated length and improve the ultimate bearing capacity when the slenderness ratio is greater than 58.2.3）The finite element simulation results are in good agreement with experimental results with difference less than 12%.Keywords: cold-formed thin-walled square steel tube column; experimental study; finite element analysis; buckling behavior*國(guó)家高技術(shù)研究發(fā)展支撐計(jì)劃(863計(jì)劃)項(xiàng)目(2009AA032304)，四川省科技支撐計(jì)劃項(xiàng)目（2011GZ0043），四川省教育廳基礎(chǔ)研究項(xiàng)目（12ZB157）。作者簡(jiǎn)介：褚云朋，博士研究生，講師，Email：chuyunpeng@swust.edu.cn。參考文獻(xiàn)［1］周緒紅，石宇，周天華，等. 低層冷彎薄壁型鋼結(jié)構(gòu)住宅體系［J］.建筑科學(xué)與工程學(xué)報(bào)，2005，22(2)：1-14.［2］姚勇，褚云朋，鄧勇軍，等.低層冷彎薄壁型鋼結(jié)構(gòu)體系動(dòng)靜性能數(shù)值模擬［J］.建筑結(jié)構(gòu)，2011，41(2)：41-45.［3］石宇，周緒紅，苑小麗，等. 冷彎薄壁卷邊槽鋼軸心受壓構(gòu)件承載力計(jì)算的折減強(qiáng)度法［J］. 建筑結(jié)構(gòu)學(xué)報(bào)，2010，31(9)：78-86.［4］羅洪光，郭耀杰，劉華琛. 冷彎薄壁軸壓柱畸變屈曲直接強(qiáng)度法和有效面積法對(duì)比分析［J］.建筑結(jié)構(gòu)，2011，41(2)：51-60.
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