索托拱壳结构静力承载机制研究与工程应用OA

To address the problem in large-span structures where structural height is constrained and stringent deformation limits are required,an arch-shell structure with cable and steel arch members was proposed.In this structure,the cables and steel arch members work together to resist vertical loads,resulting in high vertical stiffness.This paper introduced the structural composition and fundamental mechanical principles of the cable-supported arch-shell structure,and investigated the mechanism of load distribution and transfer between cables and steel arch members under gravity loads and upward wind loads.Subsequently,a parametric study of the static behavior was conducted using the control variable method,in which four key parameters were considered:aspect ratio of the structural boundary shape,the sag-to-span ratio of the cables,the rise-to-span ratio of the steel arch,and the horizontal stiffness of the supports.The results show that as the ratio of the cable span to the steel arch span increases,the nonlinearly proportion of gravity load transferred through the steel arch increases.With an increase in the sag-to-span ratio of the cables and the rise-to-span ratio of the steel arch,the structural stiffness nonlinearly improves.Additionally,as the horizontal stiffness of the supports increases,the structural stiffness nonlinearly enhances.Finally,typical structural parameters were selected for construction tensioning analysis.The calculations indicate that during the tensioning process,as the pretension force increases,the support reactions and axial forces of the steel arch decrease,while the support reactions and tensile forces of the cables increase.The successful application of the cable-supported arch-shell structure on the roof of the Chengdu Science Fiction Museum has confirmed its suitability for buildings with large spans,restricted structural heights,and stringent deformation requirements.