论文部分内容阅读
对钢柱在热荷载下的平面内弹性屈曲进行了分析。柱端有两个弹性转动弹簧约束,可模拟邻近结构构件施加的反力或者模拟弹性基础。假定温度沿界面呈线性分布。基于非线性应变-位移关系,通过能量法可得到平衡和屈曲计算方程。在3种不同的热荷载效应下对柱的屈曲进行了分析。结果表明:所提出的分析方法可用于计算弹性屈曲的临界温度。热梯度对于柱稳定性的改进具有很重要的作用。此外,当增加转动约束的刚度和减小柱长细比时,热梯度对柱的影响会减少。同时发现,转动约束会显著影响柱的弹性屈曲承载力,增加约束的转动刚度会使得临界温度上升。
The in-plane elastic buckling of steel columns under thermal load was analyzed. There are two elastic rotation springs on the column ends that simulate the reaction forces applied by the adjacent structural members or simulate the elastic foundation. The temperature is assumed to be linear along the interface. Based on the nonlinear strain-displacement relationship, the equilibrium and buckling equations can be obtained by energy method. The buckling of the column was analyzed under three different heat load effects. The results show that the proposed analytical method can be used to calculate the critical temperature of elastic buckling. Thermal gradients play an important role in the improvement of column stability. In addition, the effect of the thermal gradient on the column decreases as the stiffness of the rotation constraint increases and the slenderness ratio of the column decreases. At the same time, it is found that the rotational restraint will significantly affect the elastic buckling bearing capacity of the column, and increasing the restraining rotational stiffness will make the critical temperature rise.