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（1 長(zhǎng)安大學(xué)建筑工程學(xué)院， 西安 710061； 2 同圓設(shè)計(jì)集團(tuán)有限公司， 濟(jì)南 250101; 3 陜西省采購(gòu)招標(biāo)有限責(zé)任公司， 西安 710075； 4 陜西省高速公路建設(shè)集團(tuán)公司， 西安 710054)

［摘要］為了研究雙肢開孔冷彎薄壁型鋼拼合箱形截面立柱的軸向受力性能，采用有限元方法對(duì)拼合箱形截面立柱長(zhǎng)細(xì)比、腹板寬度、試件厚度、開洞情況及孔洞間距等參數(shù)進(jìn)行了非線性分析，并將有限元結(jié)果與《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》（GB 50018—2002）“有效寬度法”計(jì)算未開孔試件承載力進(jìn)行對(duì)比。綜合考慮腹板孔洞影響，對(duì)構(gòu)件軸壓承載力進(jìn)行折減，提出了適合雙肢開孔冷彎薄壁型鋼拼合箱形截面開孔試件軸壓承載力計(jì)算的建議修正公式。分析結(jié)果表明：試件軸壓承載力會(huì)隨長(zhǎng)細(xì)比增大及腹板孔洞的出現(xiàn)而減??；腹板位置處開孔洞會(huì)對(duì)試件極限承載力和破壞位置產(chǎn)生較大影響；開洞間距的大小不能明顯改變多孔試件的極限承載力，也不會(huì)改變多孔試件的屈曲失效模式。

［關(guān)鍵詞］冷彎薄壁型鋼； 開孔截面柱； 軸壓承載力； 有效寬度法； 折減系數(shù)

中圖分類號(hào)：TU392-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)11-0084-06

Numerical analysis and theoretical study on cold-formed thin-walled steel double limbs box section columns under axial compression

Nie Shaofeng1, Sun Yujin2, Tao Ying3, Ma Yi4

(1 School of Civil Engineering, Chang′an University, Xi′an 710061, China; 2 Tong Yuan Design Group Co.,  Ltd.,  Jinan 250101,China; 3 Shaanxi Provincial Procurement & Tendering Co.,  Ltd.,  Xi′an 710075, China; 4 Shaanxi Expressway Construction Group Company, Xi′an 710054, China)

Abstract:In order to study the structural behaviour of cold-formed thin-walled steel double limbs box section columns under axial compression, the verified finite element model was used for an extensive parametric study. Factors including slenderness ratio, web width，specimens thickness, holes and holes spacing were analyzed. The numerical study results were compared with the results calculated by “effective width method” in Technical specification for cold-bending thin-walled steel structure (GB 50018—2002). Considering the influence of web plate hole component，the axial compression bearing capacity was reduced，and modified formula of axial bearing capacity for cold-formed thin-walled steel double limbs box section columns specimens was proposed. The analytical results show that the axial bearing capacity of specimen decreases with the increment of slenderness ratio and the appearance of holes in the web. Moreover, the holes in the web have a significant influence on the ultimate bearing capacity and failure location of specimens. The holes spacing has little influence on the ultimate bearing capacity and failure mode of specimens with holes.

Keywords:cold-formed steel; columns with hole;  axial bearing capacity; effective width method;  reduction factor

*國(guó)家自然科學(xué)基金項(xiàng)目（51408052），陜西省工業(yè)攻關(guān)項(xiàng)目(2014K06-23)，陜西省青年科技新星項(xiàng)目（2016KJXX-51）。

作者簡(jiǎn)介：聶少鋒，博士，副教授，Email：niesf126@126.com。