有限元分析在桥式起重机主梁局部稳定性校核中的应用

Application of Finite Element Analysis in Local Stability Check of Main Girder of Bridge Crane

局部稳定性是桥式起重机结构承载能力的重要参数,在设计环节需要进行局部稳定性校核。主梁局部稳定性计算方法在GB3811-2008起重机设计规范中有详细规定,但其计算公式需已知主梁腹板边缘的应力大小;采用传统计算方法较为复杂耗时,一般需要2 d^3 d,且常由于计算模型简化较大,导致计算精度不高。采用有限元分析能获取结构的应力分布云图,并从有限元分析结果中直接提取应力值进行主梁局部稳定性校核,整个过程可在0.5 d内完成,且提高了计算精度。

Local stability is an important parameter of bearing capacity of bridge crane structure. The calculation method for the local stability of the main beam is specified in detail in GB3811-2008, but the calculation formula needs to know the stress magnitude of the web edge of the main beam. The traditional calculation method is complicated and time-consuming, which generally requires 2-3 working days, and is not accurate. The finite element analysis can obtain the stress distribution cloud map of the structure, and the direct extraction of the stress value from the finite element analysis results for the local stability check of the main beam can be completed within half a working day, and the calculation accuracy is improved.