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（1 同濟(jì)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］利用有限元方法建立部分包覆鋼-混凝土組合柱（PEC柱）模型，對(duì)比既有試驗(yàn)數(shù)據(jù)，校核其可行性。經(jīng)大量參數(shù)計(jì)算，在多高層建筑結(jié)構(gòu)常見(jiàn)的柱子長(zhǎng)細(xì)比范圍內(nèi)考察了壓彎構(gòu)件極限狀態(tài)下軸力-彎矩相關(guān)曲線的特點(diǎn)。提出了采用軸力-彎矩相關(guān)方程表達(dá)的PEC柱單向面內(nèi)壓彎整體穩(wěn)定承載力計(jì)算公式，利用既有試驗(yàn)數(shù)據(jù)、有限元計(jì)算數(shù)據(jù)對(duì)該公式的適用性、可靠性進(jìn)行校核。結(jié)果表明，在繞強(qiáng)軸失穩(wěn)與繞弱軸失穩(wěn)的情況下公式均偏安全且經(jīng)濟(jì)，可用于實(shí)際工程中。

［關(guān)鍵詞］部分包覆鋼-混凝土組合結(jié)構(gòu)；壓彎柱；整體穩(wěn)定承載力；工程計(jì)算公式；軸力-彎矩相關(guān)曲線

中圖分類(lèi)號(hào)：TU398+.9文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)07-0014-08

Engineering calculation of overall stability bearing capacity of partially-encased composite steel and concrete columns under eccentric 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:A partially encased composite steel and concrete columns (PEC columns) model was developed using the finite element method, and its feasibility was validated by comparison with previous experimental data. Based on a large number of parameter analysis, the characteristics of axial force-bending moment correlation curve  of the compression-bending member under the limit state were investigated within the range of column slenderness ratios which are commonly used in multi-story and high-rise buildings. The formulas for calculating the overall stability bearing capacity of PEC columns under eccentric compression were proposed using the axial force-bending moment correlation equation. The applicability and reliability of the formula were validated by previous experimental data and finite element simulation data. The results show that the formulas are safe and economical in the case of instability around the strong axis and instability around the weak axis, and can be used in practical engineering.

Keywords:partially encased composite steel and concrete structure;eccentrically loaded column;overall stability bearing capacity;engineering calculation formula;correlation curve of axial force-bending moment

*科技部重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC0701603)。

作者簡(jiǎn)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。