【摘要】 弗伦第尔网壳在双层网壳的基础上拆去斜腹杆形成,厚跨比小,稳定性是其设计的控制因素.毂式节点可有效传递杆件在面外的弯矩,而不能有效传递杆件在面内的弯矩.铝的弹性模量仅约为钢材的1/3.为了探究采用毂式节点连接的弗伦第尔铝网壳的稳定性,本文在利用Midas有限元软件对一拟建跨度为125m的弗伦第尔铝网壳进行了完善模型和缺陷模型的特征值屈曲分析后,利用Ansys有限元分析软件进行了考虑几何和材料双重非线性的全过程跟踪分析.分析结果表明:本结构对初始缺陷较为敏感,结构的实际承载力较特征值屈曲分析结果有很大程度的降低.本文系统地研究了空腹铝网壳的稳定性,可为以后类似工程提供参考.更多还原

【Abstract】 The Vierendeel shell is formed on the basis of double-layer reticulated shell removing the diagonal web members.As the ratio of thickness to height is low,the stability is the control factor in the design.The hub joint can effectively transfer the moment out of plane,but can not transfer that inner plane.Meanwhile as a new type of metal material,the elastic modulus of aluminum is only about 1/3 of the steel’s.In order to study the stability of the Vierendeel shell with hub joints connecting each member,the eigenvalue buckling analysis of perfect model and defect model of a proposed Vierendeel aluminum shell with a span of 125m is performed by the finite element software Midas.Then,the finite element analysis software Ansys is used in process tracking analysis considering geometric and material nonlinearity.The analysis results show the structure is sensitive to the initial defects,and the structure’s real bearing capacity is much lower than its buckling eigenvalue.Systemetically stability analysis can provide a reference for future similar projects.更多还原