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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.
When the load acting on the arch plane reaches the critical value, the arch may appear out-of-plane roll instability.Most radial buckling modes are used to study the out-of-plane buckling of U- Compared with the results of finite element method of the vertical load model, it is found that the radial load mode is conservative, and the error is larger in the case of large pitch-span ratio. In view of the problem of out-of-plane buckling of the steel arch, Closed section to improve the stability of the arch.Compared with the addition of partitions method, adding a slab to the arch buckling load to increase more obvious, and the addition of slab method with less material, the construction easier.Finally, The calculation formula of out-of-plane buckling load of box-section is proposed, and the formula for calculating the out-of-plane buckling load of the slab U-section arch is given for reference by engineering designers.