摘要
当作用在拱平面内的荷载达到临界值时,拱可能出现平面外的侧倾失稳.现有研究大多采用径向荷载模式来研究U型截面拱的面外失稳.本文通过对径向荷载与竖向荷载模式有限元结果的比较,发现径向荷载模式偏于保守,在大矢跨比情况下误差较大.针对钢拱容易平面外失稳的问题,提出了加设缀板形成间断闭合截面来提高拱的稳定性.相比于加设隔板的方法,加设缀板对拱的屈曲荷载提高更为明显,而且加设缀板的方法用料少、施工更加简单.最后,提出箱型截面平面外屈曲荷载的计算公式,并由此给出加设缀板U型截面拱的平面外屈曲荷载的估算公式,供工程设计人员参考.
Arch is the preferred structure under bearing pressure, but out-of-plane buckling will occur under certain bending moment. Radial load mode is adopted to study the out-of-plane instability of U- section steel arch in the most existing research. In this article, radial and vertical load models are studied using finite element analysis. It shows that the results of the radial load are more conservative, and the bigger rise-span ratio, the greater error. To prevent buckling of steel arch, this paper proposes a method which is using a discontinuous-closed cross section with adding batten plate to enhance the stability of U- section steel arch. Compared with using the U-section steel arch with clapboard, the proposed method can get greater buckling load with less material. Meanwhile, adding batten plate construction is simple and economical. Finally, this paper puts forward calculation formula of the out-of-plane buckling load of box section arch, and approximate formula is also given to predict the out-of-plane buckling load of U section arch with batten plate, which can serve as a reference in design.
出处
《空间结构》
CSCD
北大核心
2013年第2期34-39,56,共7页
Spatial Structures
基金
国家重点基础研究发展计划(973计划)资助项目(2012CB723302)
关键词
U型截面钢拱
平面外失稳
荷载模式
加缀板
U-section steel arch
out-of-plane instability
load model
with batten plate
