摘要大跨度网壳结构既具有杆系结构的特性又具有薄壳结构的优点，因其造型具 有美感、受力合理、自重轻、覆盖跨度大、节省资源等优势，在国内外广泛应用。 网壳结构节点、杆件数量繁多，为方便对其进行受力分析对其建模很有必要。同 时网壳结构振动频率大、对载荷分布敏感，不当的风载荷将导致网壳不稳定，发 生大变形甚至遭受损坏。本文利用 ANSYS 分析软件对网壳结构进行了参数化建 模、静力分析和模态分析，并分析风载荷作用下网壳结构的时域和频域特性。73837
本课题首先分析了单层球面网格的结构特点、受力特点，选取 Beam4 单元 并用 APDL 语言建立网格的参数化模型，将几何边界条件约束，施加载荷进行 静力分析，分析结果表明网壳所承受内力、应力最大的杆件在内部第二个环向圈 杆件上，通过对网壳结构模态分析得到一阶自振频率为 18.443Hz。采用线性滤 波法中的自回归算法进行风速模拟再转化为风载荷，将模拟所得的载荷施加到网 壳上，进行时域分析得到主要节点的位移、加速度的时程，分析结果表明节点的 位移均值不为 0 的随机过程和加速度均值为 0。通过对时域分析所得数据进行傅 里叶变换得到该网壳的频域特性，表明该网壳在 0.6Hz 处存在明显的共振峰。
该论文有图 31 幅，表 3 个，参考文献 29 篇。
毕业论文关键词：单层球面网壳 静力分析 模态分析 风振响应
Parametric Modeling and wind-induced responsed analysis of single-layer spherical reticulated shell
Abstract Large-span reticulated shell structure has both characteristics of frame structure and has the advantage of thin-shell structures, due to its aesthetic shape, reasonable force, light, covering the span and savings in resources and other advantages, widely at home and abroad. Numerous shell node, bar, for the convenience of its force analysis is necessary for modeling. While shell vibration frequency, load-sensitive, will result in an unstable shell of improper wind load, large deformation or damage. Analysis based on ANSYS software of reticulated shell structure in parametric modeling and modal analysis, static analysis, and analysis of reticulated shell structure under wind load time-domain and frequency-domain characteristics.
This subject first analysis has single layer spherical network grid of structure features, and by force features, selected Beam4 unit and APDL language established network grid of parameter of model, will geometry border conditions constraints, imposed load for static force analysis, analysis results showed that network shell by bear forces, and stress maximum of rod pieces in internal second a ring to circle rod pieces Shang, through on network shell structure die state analysis get a order since vibration frequency for 18.443Hz. Algorithm of linear Autoregressive filtering method is used for wind load simulation of the load will impose on the shell, time domain analysis is the main node of the displacement, acceleration time-history, analysis result indicates displacement of a node does not have the value 0 of stochastic processes and the acceleration value is 0. Based on the time domain analysis of data obtained by Fourier transform of the time domain characteristics of shell, indicating that the shell at 0.6Hz there is a clear formant.
Key Words: single-layer spherical reticulated shell static analysis modal analysis wind-induced response
目录
摘 要 I
Abstract II
目录 APDL单层球面网壳参数化建模及风振响应分析:http://www.youerw.com/jixie/lunwen_84216.html