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（1 同濟大學(xué)土木工程學(xué)院， 上海 200092； 2 上海杉達(dá)學(xué)院， 上海 201209）
［摘要］部分包覆鋼-混凝土組合柱（PEC柱）能以較小的截面尺寸承擔(dān)較大的荷載，因而在實際工程應(yīng)用中具有較大長細(xì)比，承載力轉(zhuǎn)為由整體穩(wěn)定控制。利用有限元軟件ABAQUS建立PEC軸壓柱模型，對比既有試驗數(shù)據(jù)，校核其正確性。在此基礎(chǔ)上，對不同截面尺寸、材料強度配比下的構(gòu)件進(jìn)行參數(shù)分析。根據(jù)計算結(jié)果，對PEC柱的軸壓整體穩(wěn)定系數(shù)取值提出兩種方案：一是按照《鋼結(jié)構(gòu)設(shè)計標(biāo)準(zhǔn)》（GB 50017—2017）b，c類柱子曲線進(jìn)行設(shè)計計算；二是借助《鋼結(jié)構(gòu)設(shè)計標(biāo)準(zhǔn)》（GB 50017—2017）中的柱子曲線形式，更新缺陷系數(shù)，給出新的穩(wěn)定系數(shù)曲線。將兩種方案計算結(jié)果與試驗數(shù)據(jù)進(jìn)行了比較，對其適用性進(jìn)行了研究。
［關(guān)鍵詞］部分包覆鋼-混凝土組合結(jié)構(gòu)；軸壓柱；有限元分析；設(shè)計方法；穩(wěn)定系數(shù)
中圖分類號：TU398+.9文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)07-0022-08
Engineering calculation of overall stability bearing capacity of partially-encased composite steel and concrete columns under axial compression
LIN Dehui1, CHEN Yiyi1,2, LI Jie1
(1 College of Civil Engineering, Tongji University, Shanghai 200092, China; 2 Sanda University, Shanghai 201209, China)
Abstract:Partially-encased composite steel and concrete column (PEC column) is able to bear relatively larger load with smaller cross section, resulting in its increasing slenderness ratio in practical engineering applications and the bearing capacity is controlled by overall stability. A finite element model has been set up to model the behavior of PEC axial compressive columns and validated by comparison with previous experimental data. Based on the validated models, the parametric analysis for PEC columns with various section sizes and material strength ratios of was carried out. According to the calculation results, two options were proposed to select the stability factor for overall buckling of PEC columns under axial compression: one is for the choice of column curves in Standard for design of steel structures (GB 50017—2017)，that is members under axial compression could be calculated as class b or c section for its buckling capacity; the second was that based on formula forms in Standard for design of steel structures (GB 50017—2017), imperfection factors were updated and new column curves were suggested. Results of these two design methods were compared with those of tests to study their applicability.
Keywords:partially-encased composite steel and concrete structure;axial compressive column;finite element analysis;design method;stability factor
*科技部重點研發(fā)計劃項目(2016YFC0701603)。
作者簡介：林德慧，碩士，Email: 1351164@#edu.cn；通信作者：陳以一，博士，教授，博士生導(dǎo)師，Email: yiyichen@#edu.cn。
