申宇杰，  房正刚
    （西安建筑科技大学土木工程学院，西安710055）

[摘要] 目前，我国《钢结构设计规范》( GB50017-2003)对于采用平板柱脚的轴心受压柱，柱脚均当作理想铰接对待，而实际上却具有相当可观的转动约束作用。考虑平板柱脚的约束作用后，可使柱子的计算长度减小。关于平板柱脚柱计算长度系数的计算，通常是由平板柱脚转动刚度进而推出柱计算长度系数的近似公式。通过有限元建立轴心受压柱平板柱脚模型，避开转动刚度直接求得柱计算长度系数，并分析底板厚度、锚栓直径及截面尺寸等因素对轴压柱平板柱脚转动约束的影响。
[关键词] 平板柱脚；计算长度；轴心受压柱；有限元模型
中图分类号：TU392.5    文献标识码：A  文章编号：1002-848X(2011) S2-0262-04

    Finite element analysis of axially loaded column plated column base
    Shen Yujie, Fang Zhenggang
    ( College of Civil Engineering,  Xi' an University of Architecture&Technology,  Xi' an 710055,  China)

Abstract: At present, according to Code for design of steel structures( GB50017-2003), for axially loaded column with plated column base, the column bases are considered as hinged supports, but possess actually remarkable rotational restraint. The effective length of columns can be decreased when the rotational stiffness of plated column base is considered in calculation. The effective length factor of columns is usually calculated according the approximate formula which is deduced by the rotational stiffness. Axially loaded column plated column base models were established with the finite element software, the effective length factor of columns was obtained by the method which can avoid calculating rotational stiffness of plated column bases, the influence factors on the rotational restraint of axially loaded column plated column base, such as the base plate tluckness, the diameter of anchors, the column section size were also analyzed.
Keywords: plated column base; effective length; axially loaded column; finite element model