（1 同济大学土木工程学院， 上海 200092； 2 上海杉达学院， 上海 201209）

［摘要］部分包覆钢-混凝土组合柱（PEC柱）能以较小的截面尺寸承担较大的荷载，因而在实际工程应用中具有较大长细比，承载力转为由整体稳定控制。利用有限元软件ABAQUS建立PEC轴压柱模型，对比既有试验数据，校核其正确性。在此基础上，对不同截面尺寸、材料强度配比下的构件进行参数分析。根据计算结果，对PEC柱的轴压整体稳定系数取值提出两种方案：一是按照《钢结构设计标准》（GB 50017—2017）b，c类柱子曲线进行设计计算；二是借助《钢结构设计标准》（GB 50017—2017）中的柱子曲线形式，更新缺陷系数，给出新的稳定系数曲线。将两种方案计算结果与试验数据进行了比较，对其适用性进行了研究。

［关键词］部分包覆钢-混凝土组合结构；轴压柱；有限元分析；设计方法；稳定系数

中图分类号：TU398+.9文献标识码：A文章编号：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

*科技部重点研发计划项目(2016YFC0701603)。

作者简介：林德慧，硕士，Email: 1351164@tongji.edu.cn；通信作者：陈以一，博士，教授，博士生导师，Email: yiyichen@tongji.edu.cn。