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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。
At present, China’s “Steel Structure Design Code” (GB50017-2003) for the use of flat column column axis compression column, column legs are treated as an ideal hinge, but in fact they have a considerable rotation constraint. Considering the constraint of the plate column foot, the calculated length of the column can be reduced. The calculation of the length coefficient of the column foot is usually the approximate formula of the length coefficient calculated by the rotation of the column foot. The finite element method was used to establish the model of axisymmetric column-column foot model to calculate the length coefficient of the column directly by avoiding the rotation stiffness. The influence of the thickness of the bottom plate, the diameter of the anchor bolt and the cross-sectional dimension on the rotational restraint of the columnar column of the axial compression column .