The light weight and high strength-to-mass ratio of thin-walled boxed sections have incited interest in their widespread use in the construction of domes. However, the installation of these sections in forming the dome geometry has induced initial twists and curving features, to which their mechanical response has rarely been explored. Therefore, the structural performance of a structure with thin-walled twisted box sections is numerically studied in this paper, employing ANSYS, the verification of which is carried out through a comparison with experimental results. Additional components examined include the longitudinal stiffening rib, diaphragm, and web. The effects of variations in the thicknesses of these member plates on the mechanical behaviors are investigated. In general, the ultimate capacity of the structure is improved by increasing the thickness of the longitudinal stiffening rib, diaphragm, and web, but the strengthening effect of the stiffener is limited by a certain thickness enhancement. The common failure mode of the initial model is found to be an overall elastic-plastic buckling. A reduction in the thickness of the stiffener or web creates a curving deformation zone in the lower arch at the ultimate capacity, whereas the diaphragm thickness has little effect on the failure mode of the model.

中文翻译：

---

薄壁扭转箱形截面结构的结构性能

薄壁盒装截面的重量轻和强度质量比高，这引起了人们对其在穹顶结构中的广泛应用的兴趣。然而，这些部分在形成圆顶几何形状时的安装会引起初始扭曲和弯曲特征，很少探索它们的机械响应。因此，本文采用ANSYS对薄壁扭箱截面结构的结构性能进行数值研究，并通过与试验结果的对比进行验证。检查的其他组件包括纵向加强肋、隔膜和腹板。研究了这些构件板的厚度变化对机械性能的影响。一般来说，通过增加纵向加劲肋、隔板和腹板的厚度来提高结构的极限承载力，但加劲肋的加强效果受限于一定的厚度增加。发现初始模型的常见失效模式是整体弹塑性屈曲。加强筋或腹板厚度的减少在极限承载力下在下拱处产生弯曲变形区，而隔膜厚度对模型的破坏模式几乎没有影响。