拉索预应力巨型网格结构参激振动及动力稳定性研究  

Research on parametric vibration and dynamic stability of prestressed reticulated mega-structures

作　　者：贺拥军[1] 贾志诚 周绪红[2] HE Yongjun;JIA Zhicheng;ZHOU Xuhong(College of Civil Engineering,Hunan University,410082 Hunan,China;College of Civil Engineering,Chongqing University,400044 Chongqing,China)

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]重庆大学土木工程学院,重庆400044

出　　处：《应用力学学报》2023年第1期146-153,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.51878261,51890902)。

摘　　要：针对拉索预应力巨型网格结构的参激振动及动力稳定性问题进行了研究。首先建立索-拱简化模型,分析了桁架拱拉索参激振动的诱发机制与特征,并利用ANSYS软件进一步探究了参激振动的影响因素,然后对简谐荷载作用下拉索预应力桁架拱及整体结构的动力稳定性进行了分析。研究表明:当结构振动频率为索基频的2倍左右时,拉索会发生参激振动,振动响应特征与激励幅值、阻尼、拉索初张力、支承方式等相关;拉索预应力桁架拱在水平简谐荷载作用下一般会发生动力失稳破坏,在竖向简谐荷载作用下发生动力强度破坏,拉索预应力巨型网格整体结构在简谐荷载作用下通常发生动力失稳破坏。The parametric vibration and dynamic stability of prestressed reticulated mega-structures was investigated.Firstly,a bowstring-arch model was derived to analyze the mechanism and characteristics of the parametric vibration of the cables on cable-strut,and the influencing factors were further discussed by utilizing ANSYS.Then the dynamic stability of the cable-strut and the prestressed reticulated mega-structures was researched under harmonic loads.The analytical and numerical results indicate that the cable will have a larger scale vibration stimulated by low excitation amplitudes when the structural vibration frequencies is close to twice of natural frequency of cables.The dynamic instability failure usually occurs on cable-strut under the horizontal harmonic load while the dynamic strength failure happens under the vertical harmonic load,and generally,the dynamic instability failure takes place in the prestressed reticulated mega-structures under the harmonic loads.

关 键 词：拉索预应力巨型网格结构 参激振动 动力失稳破坏 动力强度破坏 

分 类 号：TU393.3[建筑科学—结构工程]