U型截面钢拱平面外稳定分析

U型截面钢拱由三块钢板焊接而成,可在截面内浇注混凝土形成钢-混组合结构,从而充分利用底板钢材的抗拉性能.当作用在拱平面内的荷载达到临界值时,拱可能出现平面外屈曲即侧倾问题,而使整个结构发生平面外失稳.如果U型截面钢拱沿整个弧线长度上没有隔板,则会出现两个侧板的局部屈曲.通过建立有限元计算模型,讨论了不同参数,包括截面尺寸,边界条件,有无隔板以及隔板间距情况下钢拱的稳定问题,并对计算结果进行分析,利用最小二乘法拟合,得到钢拱平面外稳定承载力的计算公式,可为工程设计提供参考依据.

Out-of-plane stability analysis of U-section steel arch

Introduced in this paper is a new U-section steel arch which is welded by three steel plates.It can be used as a single section in steel structure,as well as a composite section when concrete cast in hybrid structure.Arch is the preferred structure under bearing pressure,but for certain bending moment,out-of-plane instability,which is also called lateral buckling,in the whole structure will occur,while local buckling in U-shape section may also appear at the same time.In this paper,two kinds of instabilitie...