石油化工设计 ›› 2025, Vol. 42 ›› Issue (3): 6-11.

• 设计技术 • 上一篇    下一篇

基于弹性和弹塑性预应力的结构屈曲对比分析

左安达1,韩志威1,石乾宇2,李翔3   

  1. 1.惠生工程(中国)有限公司,上海 201210

    2.哈尔滨锅炉厂有限责任公司,黑龙江哈尔滨 150046

    3.上海第二工业大学 资源与环境工程学院,上海 201209

  • 收稿日期:2025-01-02 出版日期:2025-08-25 发布日期:2025-08-25
  • 作者简介:左安达,男,2013年毕业于大连理工大学安全技术及工程专业,硕士,主要从事石油化工静设备的常规设计与分析设计工作,高级工程师。联系电话:021-20308037.

Comparative Buckling Analysis of Structures based on Elastic and Elastic-plastic Pre-stress

Zuo Anda1, Han Zhiwei1, Shi Qianyu2, Li Xiang3   

  1.  1. Wison Engineering Ltd., Shanghai, 201210;  2. Harbin Boiler Company Ltd., Harbin, Heilongjiang, 150046;  3. School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai, 201209
  • Received:2025-01-02 Online:2025-08-25 Published:2025-08-25

摘要: 国标GB/T 4732-2024《压力容器分析设计》引进了ASME Ⅷ-2-2021中关于屈曲分析和评定的新方法,对新方法的正确认识有助于将来在工程设计中的合理利用。现从屈曲的理论基础出发,以压力容器中典型组合结构为例,基于弹性和弹塑性预应力的两种屈曲分析方法进行有限元数值计算及结果对比分析,得出若干结论供参考和进一步探讨:屈曲分析中通常以第1阶屈曲模态计算屈曲载荷并确定许用载荷是合理可行的;对处于弹性屈曲状态的结构,弹性和弹塑性预应力屈曲分析最终计算得到的屈曲载荷值几乎是相同的,实际工程应用中可直接采用弹性预应力屈曲分析以减少计算工作量并提高计算效率,最终确定的许用载荷值相较于弹塑性预应力屈曲分析,安全裕量也更大。

关键词: 压力容器, 有限元, 弹性预应力, 弹塑性预应力, 屈曲分析

Abstract:

GB/T4732 Pressure Vessels Design by Analysis has introduced the new methods for buckling analysis and evaluation in ASME Ⅷ-2-2021. The correct understanding of the new methods will be helpful for their rational use in engineering design in the future. Based on the theoretical principles of buckling, this paper takes typical combined structures in pressure vessels as an example, and carries out finite element numerical calculations using two buckling analysis methods based on elastic and elastic-plastic pre-stress. After comparative analysis, some conclusions were obtained for reference and further discussion. It is reasonable to calculate the buckling load with the first-order buckling mode and determine the allowable load accordingly in buckling analysis. For structures in elastic buckling state, the buckling load values calculated by elastic and elastic-plastic pre-stress analysis are almost the same. In practical engineering applications, elastic pre-stress buckling analysis can be directly used to reduce the calculation workload and improve the calculation efficiency, and the final allowable load value has a greater safety margin than that determined by elastic-plastic pre-stress buckling analysis.

Key words: pressure vessel, finite element, elastic pre-stress, elastic-plastic pre-stress, buckling analysis