摘要
索膜结构属于风敏感结构,其在风荷载作用下的反应,与结构的自振特性密切相关。通过索膜结构的自振特性分析发现,索膜结构的自振频率较低且呈连续密集分布,振型也比较复杂;影响其自振特性的主要结构参数是膜中预应力和结构跨度,随着膜中预应力的增加,自振频率呈较大幅度提高,而随着结构跨度的增大,自振频率却大幅度降低;另外,加劲索的张拉刚度对自振频率特别是第一自振频率影响很小;运用有限元软件ANSYS模拟分析了一个实际算例,验证了以上结论。
Cable - membrane structure is a wind sensitive structure. Response under wind - load correlates with free vibration characteristics. Free vibration characteristics of cable - membrane structure are analyzed. Results show that the free vibration frequency is low and distributes in succession, and the vibration modes are complicated. The prestress in membrane and the structure＇s span are two main structural parameters influencing free vibration characteristics of cable - membrane structure. The free vibration frequency increases greatly along with increase of the prestress in membrane, and it reduces greatly with the increase of the structure span.
出处
《计算机仿真》
CSCD
北大核心
2009年第4期328-330,334,共4页
Computer Simulation
基金
陕西省教育厅2006年度科学研究计划项目(06JK271)
关键词
索膜结构
自振特性
自振频率
风荷载
Cable - Membrane structure
Free vibration characteristics
Free vibration frequency
Wind - load
