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（東北林業(yè)大學土木工程學院， 哈爾濱 150040）
［摘要］為了研究翼緣V形加勁對高強冷彎薄壁槽鋼受彎構(gòu)件屈曲模式和承載力的影響，分別對翼緣無V形加勁、翼緣偏腹板一側(cè)V形加勁、翼緣中間V形加勁以及翼緣偏卷邊一側(cè)V形加勁等4種截面形式的8組G550高強冷彎薄壁槽鋼受彎試件進行了靜力試驗研究。結(jié)果表明，翼緣V形加勁試件相比翼緣無V形加勁試件的受彎承載力提高了28%～53%，且翼緣V形加勁導致試件的畸變屈曲問題突顯；翼緣V形加勁位置對試件的屈曲模式和受彎承載力有重要影響，且與卷邊寬度有關(guān)。短卷邊試件表現(xiàn)為畸變屈曲，其中翼緣中間V形加勁試件的受彎承載力最大；長卷邊試件表現(xiàn)為局部與畸變的相關(guān)屈曲，其中翼緣偏腹板一側(cè)V形加勁試件的受彎承載力最大，但較翼緣中間V形加勁試件的受彎承載力提高了不到1%；綜合考慮，翼緣中間V形加勁對提高試件受彎承載力效果最好。對試驗進行了有限元模擬，試驗結(jié)果與有限元模擬結(jié)果吻合良好。
［關(guān)鍵詞］高強冷彎薄壁槽鋼； 受彎構(gòu)件； 翼緣V形加勁； 屈曲模式； 受彎承載力； 有限元模擬
中圖分類號：TU392-1文獻標識碼：A文章編號：1002-848X(2018)23-0101-07
Buckling behavior experiment and numerical simulation on G550 high-strength cold-formed thin-walled channel steel flexural members with V-shaped stiffeners in flange
Zhao Jinyou, Li Jing, Li Ying
(College of Civil Engineering, Northeast Forestry University, Harbin 150040, China)
Abstract:In order to investigate the influence of the V-shaped stiffeners in the flanges on buckling modes and bearing capacity of high-strength cold-formed thin-walled channel steel flexural members, static test research was conducted on 8 groups of G550 high-strength cold-formed thin-walled channel steel flexural specimens with 4 kinds of cross-sections 1 11including non-V-shaped stiffening flange, V-shaped stiffening flange near the web, intermediate V-shaped stiffening flange and V-shaped stiffener flange near the edge. Results indicate that bending strength of the specimens with V-shaped stiffening flange can be increased about 28% to 53% compared with the specimens without V-shaped stiffening flange, and the distortional buckling of the specimen is more prominent due to V-shaped stiffening flange. The flange stiffening position has a significant influence on the bending strength and buckling mode of the specimens, which are also related to the edge stiffener width. The distortional buckling occurs on the specimens with the short edge stiffener, in which bending strength of the specimens with intermediate V-shaped stiffening flange is the maximum. The interaction between local and distortional buckling occurs on the specimens with the long edge stiffener, in which bending strength of the specimens with V-shaped stiffening flange near the web is the maximum but no more than 1% of bearing capacity of specimens with intermediate V-shaped stiffening flange. Overall, intermediate V-shaped stiffening flange is the best way to increase the bending strength of the specimens. The finite element simulation of the experiments was carried out, and the experimental results were in good agreement with the finite element simulation results.
Keywords:high-strength cold-formed thin-walled channel steel; flexural member; V-shaped stiffener in flange; buckling mode; bending strength; finite element simulation
*黑龍江省自然科學基金項目（E2015056），中央高?；究蒲袠I(yè)務(wù)費專項項目（2572017CB01）。
作者簡介：趙金友，博士，副教授， Email: jinyou2000@163.com。
