【摘要】 在钢筋混凝土多、高层建筑结构中,可能出现一些长细比、轴压力比常规柱类构件明显偏大的框架柱类构件,设计时需要考虑这类构件是否面临失稳风险,本文拟对此类构件的稳定性验算提出建议方法。为此梳理了压杆稳定问题的有关概念,给出了框架柱"非弹性计算长度"的求解方法,运用非线性有限元分析了框架柱对应的非弹性单杆模型在各主要因素影响下稳定临界荷载的变化规律并据此拟合出其数学表达式,最后根据上述结果给出了框架柱类构件沿一个平面主轴的稳定性验算方法。更多还原

【Abstract】 In reinforced concrete multi-rise and high-rise building structures,it is possible that some frame column members have significantly larger slenderness ratio and axial compression force than those of conventional ones.In this case,it is needed in the design phase to consider whether such members are at risk of instability,and thus a stability checking method for such members was proposed in this paper.Related concepts of column stability were presented and a method of calculating the"inelastic effective length"of frame column was proposed.Nonlinear finite element method was applied to analyze the change rule of stable critical load of inelastic column models corresponding to frame columns under the effect of main factors,and accordingly.a mathematical expression of stable critical load could be fitted.Eventually a stability checking method of frame column members along a plane principal axis was given based on above results.更多还原