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（西南科技大學(xué)土木工程與建筑學(xué)院， 綿陽 621010）
［摘要］進(jìn)行了4組共36個冷彎薄壁方鋼管長柱的軸心壓力試驗，考慮了長細(xì)比、不同填充材料兩個變化參數(shù)，得到了試件的破壞模式及承載力等。結(jié)果表明，試驗中空鋼管柱發(fā)生失穩(wěn)破壞，由于寬厚比較大，局部失穩(wěn)發(fā)生后迅速導(dǎo)致整體失穩(wěn)，而填充材料后的試件，局部失穩(wěn)后承載力降低緩慢，依然可繼續(xù)承載；空鋼管側(cè)向位移值不易滿足《低層冷彎薄壁型鋼房屋建筑技術(shù)規(guī)程》（JGJ 227—2011）規(guī)定限值，尤其是當(dāng)長細(xì)比達(dá)到172-9時，側(cè)向位移值更難得到保證，而填充輕質(zhì)耐壓材料后可有效限制其側(cè)向位移發(fā)展，構(gòu)成柱的第二道抗破壞防線。填充材料后的柱，其穩(wěn)定承載力明顯提高；柱長細(xì)比越大，承載力提高越明顯。
［關(guān)鍵詞］冷彎薄壁方鋼管木組合長柱； 試驗研究； 極限承載力； 破壞模式
中圖分類號：TU398+.6文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2017)04-0075-06
Experimental study on axial compression behavior of cold-formed thin-walled square steel tube-timber composite long columns
Chu Yunpeng, Yao Yong, Yang Dongsheng, Zhang Chuntao
(College of Civil Engineering, Southwest University of Technology, Mianyang 621010, China)
Abstract:Experimental study on 4 groups of 36 specimens of axial compression behavior of cold-formed thin-walled square steel tube long columns was conducted considering two parameters of slenderness ratio and different filling materials, to obtain specimen failure mode and bearing capacity. Results show that the hollow steel tube columns suffer from unstable failure and overall instability rapidly occurs after local buckling due to the large width-thickness ratio. Bearing capacity of specimens with filling materials decreases slowly after local buckling, so the specimens can still undertake loadings. Lateral displacement value of hollow steel tube hardly meets requirements of limited value in Technical specification for low rise cold-formed thin-walled steel building (JGJ 227—2011) and lateral displacement value is more difficult to meet, especially slenderness ratio reaches 172-9. While steel tube filling the light pressure-resistant material can effectively limit the development of its lateral displacement to constitute the second lines of defense against damage of the column. The stability bearing capacity of the column is obviously improved after filling material, and the bigger the slenderness ratio is, the more obvious the bearing capacity is improved.
Keywords:cold-formed thin-walled square steel tube\|timber composite long column; experimental study; ultimate bearing capacity; failure mode
*國家自然科學(xué)基金項目(51508482)，四川省科技支撐計劃項目（2016GZ0318）。
作者簡介：褚云朋，博士研究生，副教授，Email:chuyunpeng@swust.edu.cn。
