摘要
针对某工业厂房跨度大、荷载大、对挠度要求严格的特点,设计了一个双向张弦梁屋盖结构。通过对下弦索施加预拉力,与上弦杆通过撑杆成为一个整体受力的体系,结构呈现出较大的竖向刚度。在外荷载的作用下,跨中挠度仅为跨度的1/495,满足了工艺专业对屋盖挠度的要求。设计的杆件的应力比均不大于0.88,应力比分布较为均匀、合理。另外,由于双向张弦梁结构的上弦梁双向交叉布置,相较于普通的平面张弦梁结构,增强了张弦梁结构的面外稳定性,使其空间受力性能较好。结构的线性稳定的安全系数为5.2,非线性稳定性的安全系数为2.63,均满足规范要求,安全冗余度较高。结构在正常使用阶段,构件均处于线弹性状态,不会发生破坏,设计较为合理,可供类似项目设计参考。
Aiming at the characteristics of a long span,large load and strict deflection requirements of an industrial workshop,this paper illustrates the design of a two-way beam string roof structure.By applying prestress force to the lower cable,the upper beam and lower cable become an integral stress system through the braces.In this way,the whole structure presents a large vertical stiffness.Under the action of external load,the mid-span’s deflection is only 1/495 of the span length,which reaches the requirements of craft profession for the deflection of roof.The stress ratio of the component is less than 0.88,in order to require a relative uniform and reasonable stress ratio distribution.In addition,because of the bidirectional cross-arrangement of the upper beam of this two-way beam string structure,the out-of-plane stability of the beam string structure can be enhanced and its spatial mechanical performance is better by comparing with the ordinary plane beam string structure.The safety redundancy of structure is high,which is reflected in the linear stability safety factor of 5.2 and the non-linear stability safety factor of 2.63.In the normal use stage of the structure,the members are in a linear elastic state.There will be no damage and the design is reasonable,it can be used as a reference for the design of similar projects.
作者
陈松
CHEN Song(China Aviation Planning and Design Institute(Group)Co.,Ltd.,Beijing 100120,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S01期603-607,共5页
Building Structure
关键词
张弦梁
大跨空间结构
预应力钢结构
有限元分析
beam string
large-span spatial structure
prestressed steel structure
finite element analysis
