摘要
有限元软件被广泛应用于以起重机金属结构为代表的结构稳定性计算中,通过有限元分析可以得到结构的特征值稳定系数k。从轴压稳定性分析角度,选择起重机结构常用材料Q345B和FGS90WV,分别研究了悬臂梁的轴压稳定问题和起重机动臂载荷平面外失稳问题,建立了结构的稳定系数k和强度安全系数n之间的关系。研究结果表明:结构的稳定系数k和构件长细比、边界支撑条件、非保向力有关;结构通过轴压稳定校核的前提条件是结构稳定系数k恒大于强度安全系数n。结构稳定系数k需合理取值才能保证结构的安全。
The finite element software is widely used in the structural stability calculation represented by the crane metal structure. The finite element analysis can obtain the eigenvalue stability coefficient k of the structure. From the perspective of axial compression stability analysis,the materials Q345 B and FGS90 WV are selected. The axial stability of the cantilever beam and the out-of-plane instability of the crane boom are studied respectively. The relationship between the stability coefficient k and the strength safety factor n of the structure is established. The results show that the stability coefficient k of the structure is related to the slenderness ratio of the beam,the boundary support condition and the following force. The prerequisite to pass the structural stability check duo to the axial compression is that the structural stability coefficient k is greater than the strength safety factor n. The structural stability factor k needs to be reasonably designed to ensure structural safety.
作者
张宏生
陆念力
ZHANG Hongsheng;LU Nianli(School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China)
出处
《中国工程机械学报》
北大核心
2020年第4期310-313,共4页
Chinese Journal of Construction Machinery
基金
哈尔滨工业大学宇航空间机构及控制技术重点实验室开放基金资助项目(30620170208)。
关键词
稳定性分析
有限元分析
特征值分析
轴压稳定性
非保向力
buckling analysis
finite element analysis
eigenvalue analysis
axial compression stability
following force
