超大跨钢桁架穹顶组合网壳不同简化支承的分析对比  

Structural Analysis of a Super-span Reticulated Shell Composed of Steel Trusses and a Suspendome with Different Supports

作　　者：刘金鹏[1] 邓长根[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《结构工程师》2016年第5期51-58,共8页Structural Engineers

基　　金：国家自然科学基金项目(51478330)

摘　　要：对建造在钢筋混凝土框架顶上的超大跨钢桁架弦支穹顶组合网壳结构,用SAP2000分别建立了底部框架支承、协同弹性支承、简化弹性支承、不动铰支承的网壳结构有限元模型,计算并对比了这些网壳结构有限元模型在重力荷载和温度作用组合下的自振特性、关键构件轴力、竖向位移、屈曲因子,以考察不同支承条件对钢网壳结构受力性能的影响。从分析精度和可靠性方面综合评价,选用有限元模型的优先顺序为底部框架支承模型、协同弹性支承模型、简化弹性支承模型、不动铰支承模型。不动铰支承模型可简化分析,亦可满足工程精度要求,在适当条件下可在结构设计分析中采用。A super-span reticulated shell composed of steel trusses and a suspendome built on top of reinforced concrete frames was simulated with SAP2000 with one of the following finite element models： the reticulated shell with bottom frame supports,with synergistic elastic supports,with simplified elastic supports,or with fixed hinge supports. The vibration characteristics,vertical displacements,key member axial forces,and buckling factors of above four finite element models under loads and action combination were calculated and compared to investigate the effects of these four different supports. The priorities of finite element models based on the analysis accuracy and reliability are the bottom frame support model,the synergistic elastic support model,the simplified elastic support model,the fixed hinge support model. The fixed hinge support model may be adopted in structural design and analysis under appropriate conditions since it may simplify analysis and meet the engineering accuracy requirement.

关 键 词：钢网壳 弹性支承 自振特性 关键构件轴力 竖向位移 屈曲因子 

分 类 号：TU399[建筑科学—结构工程]