李雪琛¹，  吴晓兰²，  左中杰¹，  张华栋¹，  王  立³
   （1 中电投工程研究检测评定中心振动所，北京 100840； 2 中国建筑技术集团有限公司，北京100013；3 中国电子工程设计院，北京 100840）

[摘要] 采用ABAQUS软件建立了多室式钢管混凝土T形长柱的有限元模型，对4组试件进行了模拟分析，得出荷载-位移曲线。在此基础上对多室式钢管混凝土T形长柱的偏压性能进行分析，得出N/N_u -M/M_u相关曲线，分析了各参数对N/N_u-M/M_u相关曲线的影响。采用已有钢管混凝土承载力计算公式，对有限元分析结果进行数值回归，引入 δ、η等系数，提出该类长柱偏压承载力简化计算方法。分析结果表明，所提出的简化计算公式与数值模拟结果符合良好，可供工程设计参考。
[关键词] 钢管混凝土；多室式；T形截面；偏压；有限元
中图分类号：TU398    文献标识码：A  文章编号：1002-848X(2012) Sl-0754-05

Performance analysis on multi-cell T-shaped concrete filled steel tubular long cloumn under eccentric compression
Li Xuechen¹, Wu Xiaolan², Zuo Zhongjie¹, Zhang Huadong¹, Wang Li³
(1 C +E Center for Engineering Research Test and Appraisal, Beijing 100840, China; 2 China Building Technique Group Co., Ltd., Beijing 100013, China; 3 China Electronics Engineering Design Institute, Beijing 100840, China)

Abstract: The finite element modes of multi-cell T-shaped concrete filled steel tubular long column were established by using ABAQUS software. Four groups of specimens were analyzed, and the calculated force-displacement curve was drawn. On the basis of investigation above, analyses on multi-cell T-shaped concrete filled steel tubular long column under eccentric compression were proceed, and N/N_u-M/M_u curves were obtained. The effects of various factors on the N/N_u-M/M_u curves were analyzed. A simplified formula for calculating the ultimate strength of the new type of composite members under eccentrically loading is recommended in the end, using the formula form which had been applied. Analysis results show that the calculation results from the proposed formulas agree well with the finite element analysis results. The formulas are valuable to the engineering design.
Keywords: concrete filled steel tubular columns, multi-cell; T-shaped section; eccentric compression; finite element method