隧道救援吊车机臂的结构分析

Structural Analysis of Tunnel Rescue Crane Boom

为了在设计阶段确定隧道救援吊车在起吊过程中机臂的变形情况和应力分布以及应力集中点位置,使用有限元法对作业状态下的机臂进行数值模拟.利用ANSYS软件完成了机臂在3种工况下(仅考虑自重;自重和15 t起吊载荷;自重和60 t起吊载荷)的强度及刚度计算,并基于强度分析和刚度分析对机臂进行了安全评定.结果表明:不同工况下,应力具有相似的分布规律,最大应力出现在机臂与支柱接触点附近以及耳梁与机臂腹板连接处,可以通过加厚耳梁翼板和腹板、增加支撑板数量、使用强度等级更高的材料来提高机臂的强度和刚度.

To determine the tunnel rescue crane deformation condition of boom, and the stress distribution and the stress concentration in the lifting process at the design stage, the numerical simulation calculations have been carried out to analyze the operating state of the crane boom by the finite element method. The calculation of strength and stiffness of crane boom under the three load cases （dead weight, dead weight plus 15 t lifting loads, dead weight plus 60 t lifting loads）were completed by using ANSYS software, and then the safety assessment of the boom was performed based on strength and stiffness analysis. The results show that the stress distribution is similar under different working conditions. Moreover, the maximum stress appears near the contact point of boom and pillar, the junction of beam with lifting eyes and boom web. To improve the strength and stiffness of the crane boom, we should thicken the flange and web of beam with lifting eyes, increase the number of support plates and use high strength materials.