摘要
根据考虑结构几何非线性的有限元动力时程积分算法,开发了有限元程序SD_FEM。使用该程序建立了精细的索-梁组合结构有限元模型,计算了结构的自振特性与结构在外部动力荷载作用下的振动响应。分别讨论了当整体结构自振频率与拉索局部自振频率有1∶1、2∶1和不成倍数关系时,索-梁相关振动导致拉索振动的状况。分析了数值计算结果,总结了索-梁相关振动的本质规律。
A nonlinear FEM program named SD-FEM was developed based on the FE dynamic time history integral algorithm considering geometric nonlinearity. A micromesh FE model for a cable-beam structure was built by using the program,its natural vibration characteristics and its vibration response under external dynamic loading were calculated.The situations of local cable vibration caused by cable-beam vibration were discussed when the ratio of the global natural frequency of the model to the natural frequency of cable was 1 ∶ 1,2 ∶ 1 and not a multiple,respectively. The numeric calculation results were analyzed,and the essential rules of cable-beam vibration were summarized.
出处
《振动与冲击》
EI
CSCD
北大核心
2015年第5期159-167,共9页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(51178396)