几种空腹网壳的自振特性理论研究
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摘要
采用有限元软件ANSYS建立了球面、柱面以及双扁壳三种空腹网壳为算例的三维空间梁单元计算模型,探讨了在结构参数矢跨比、网壳厚度、网格尺寸和杆件截面对空腹网壳动力特性的影响。本文提取了前20阶自振频率和前12阶模态振型,分析了三类网壳自振频率和基本频率在上述参数变化时的变化规律,以及网壳模态振型随阶次增加的振动规律,对空腹网壳结构的合理参数范围给出了建议,为网壳设计和抗震分析提供参考。
Three calculated models of Spherical,Hyperboloid and Cylindrical Vierendeel Latticed Flat Shell were established by finite element software ANSYS.The influence of dynamic characteristics on structure parameters of ratio of height and span,grid size,shell thickness and Grid rods section was discussed.The top 20 rank-order frequency and top 12 rank-order mode shape were extracted.The rule of three types of vierendeel shell vibration frequency and fundamental frequency which changed with the parameters told above were analyzed,and analysis of shell mode shapes changed with increasing order of variation,recommendations of appropriate range of shell parameters were given,which provided a reference for design and seismic analysis of the shell.
Three calculated models of Spherical,Hyperboloid and Cylindrical Vierendeel Latticed Flat Shell were established by finite element software ANSYS.The influence of dynamic characteristics on structure parameters of ratio of height and span,grid size,shell thickness and Grid rods section was discussed.The top 20 rank-order frequency and top 12 rank-order mode shape were extracted.The rule of three types of vierendeel shell vibration frequency and fundamental frequency which changed with the parameters told above were analyzed,and analysis of shell mode shapes changed with increasing order of variation,recommendations of appropriate range of shell parameters were given,which provided a reference for design and seismic analysis of the shell.
引文
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