【摘要】 文中以220 t全地面起重机伸缩臂架为研究对象，基于弧长法采用Abaqus软件对其进行非线性稳定性分析，根据载荷-位移曲线并结合弹塑性理论分析了臂架结构失稳的整个过程。由2种加载方式的对比结果表明，考虑了P-δ和P-Δ双重二阶效应的加载方式2的臂架模型与主要考虑了P-δ效应的加载方式1的臂架模型相比，其几何大变形效应更加显著，极值点失稳载荷值也有所降低，乃至臂架失稳后其侧向变形对臂架的倒塌趋势也会产生较大影响，该分析结果可为臂架结构工程设计提供分析依据。更多还原

【Abstract】 Taking the 220 t all terrain crane telescopic boom as the research object, the nonlinear stability of the boom was analyzed through Abaqus software based on the arc length method. By examining the load-displacement curve and applying elastic-plastic theory, the entire process of the boom’s structural buckling was dissected. A comparative analysis of the two loading modes indicated that the boom model under Loading Mode 2, which accounts for the compound secondorder effects of P-δ and P-Δ, exhibited more pronounced geometric large deflection than the model under Loading Mode 1, which primarily considers the P-δ effect. Consequently, the buckling load at the extreme point was reduced. Even postdeformation, the lateral deformation of the boom significantly influenced its collapse trajectory. These findings can serve as a valuable analytical basis for the engineering design of boom structures.更多还原