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本文提出了臂架在变方向轴力作用下临界力的计算公式,从而使能量法求纵横弯曲的挠度公式应用于桁架式臂架计算,使问题得以简化。文中还提出了用刚度条件保证臂架的总体稳定,满足刚度和强度条件后,无须再验算总体稳定。此法不但简便而且具有较高的精度。该方法的应力和挠度计算值与实测值比较吻合。
In this paper, the calculation formula of the critical force of the boom under axial force of variable direction is put forward, so that the deflection formula of longitudinal and transverse bending by the energy method is applied to the truss boom calculation, which simplifies the problem. It is also proposed in this paper that the overall stability of the boom is guaranteed by the stiffness condition, and the stiffness and strength conditions are satisfied without the need of checking the overall stability. This method is not only simple but also has high precision. The calculated stress and deflection of the method are in good agreement with the measured values.