Static Behavior Research for New Spherical Suspendome Structures of Non-Circular Architectural Plan

The existing spherical suspendome structure is mainly suitable for buildings whose plane projection is standard circle. The supports around the structure are at the same elevation. When the plane required by the building is polygon or irregular curve shape composed of multiple arcs with different diameters, the existing conventional arrangement of spherical suspendome cannot meet the needs of this kind of building. In order to study the applicability of the spherical suspendome in the non-standard circular building whose plane projection is polygon or multiple arcs, this paper introduces a new type of spherical suspendome structure system, which is suitable for the plane of non-circular building. The spherical suspendome structure with good mechanical performance is applied to the building with irregular plane projection by using supports located in different elevations. The axis of the plane projection profile is composed of eight arcs, the dimension of the long axis is 89.89 m, the dimension of the short axis is 82.674 m, the height of the short axis is 4.104 m, and the height of the long axis is 4.876 m. The upper single-layer reticulated shell is arranged in K8+grid, with five ring cables and struts. In this paper, the effects of rise-span ratio, strut length, initial tension of ring cable, cross-sectional area of ring cable and horizontal stiffness of support on the structural displacement, internal force of member and reaction force of support of the new suspendome are studied. The results show that:1) the maximum vertical displacement of the new spherical suspendome decreases with the increase of the short axis rise span ratio, the length of the strut, the initial tension of the ring cable, the cross-sectional area of the ring cable and the horizontal stiffness of the support. 2) The maximum axial force decreases with the increase of the brace length, the initial tension of the ring cable, the cross-sectional area of the ring cable and the horizontal stiffness of the support, and does not vary with the short axis rise span ratio. The internal force of brace and ring cable decreases with the increase of short axis rise span ratio and horizontal stiffness of support, increases with the increase of initial tension of ring cable, and changes with brace length and ring cable section area are complex. The unbalanced force of ring cable joint decreases with the increase of short axis rise span ratio, strut length and support horizontal stiffness, and increases with the increase of ring cable initial tension and ring cable section area. 3) With the increase of the short axis rise span ratio, the horizontal reaction of the support is basically unchanged, while the vertical reaction of the support decreases; with the increase of the length of the strut and the cross-sectional area of the ring cable, the horizontal reaction of the support decreases, while the vertical reaction of the support increases; with the increase of the initial tension of the ring cable, the horizontal reaction of the support and the vertical reaction of the support decrease; with the increase of the horizontal stiffness of the support, the horizontal reaction of the support increases, while the vertical reaction of the support increases.