摘要:
现有球面弦支穹顶结构主要适用于平面投影为标准圆形的建筑，其结构周圈的支座位于同一标高。当建筑要求的平面为多边形或者由多段不同直径圆弧构成的不规则曲线形状时，现有常规的球面弦支穹顶布置形式无法满足该类建筑的需求。为研究球面弦支穹顶在平面投影为多边形或多段圆弧构成的非标准圆形建筑中的适用性，介绍了一种新型球面弦支穹顶结构体系，该体系适用于非圆建筑平面，通过采用位于不同标高内的支座将受力性能较好的球面弦支穹顶结构应用到平面投影不规则的建筑中。其平面投影轮廓轴线由八段圆弧组成，长轴尺寸89.89 m，短轴尺寸82.674 m，短轴方向矢高4.104 m，长轴方向矢高4.876 m。上层单层网壳采用K8+联方型网格布置，共设置了五道环索和撑杆。
研究了矢跨比、撑杆长度、环索初拉力、环索截面积和支座水平刚度等参数变化对该新型弦支穹顶结构的结构位移、杆件内力和支座反力等静力性能的影响规律。研究结果表明：1）随着短轴矢跨比、撑杆长度、环索初拉力、环索截面积和支座水平刚度的增大，新型球面弦支穹顶结构最大竖向位移减小。2）网壳最大轴力随着撑杆长度、环索初拉力、环索截面积和支座水平刚度的增大而减小，不随短轴矢跨比变化。撑杆内力和环索内力随着短轴矢跨比和支座水平刚度的增大而减小，随着环索初拉力的增大而增大，随着撑杆长度和环索截面积变化复杂。环索节点不平衡力随着短轴矢跨比、撑杆长度和支座水平刚度的增大而减小，随着环索初拉力和环索截面积的增大而增大。3）随着短轴矢跨比增大，支座水平反力基本不变，而支座竖向反力减小；随着撑杆长度和环索截面积的增加，支座水平反力减小，而支座竖向反力增加；随着环索初拉力的增大，支座水平反力、支座竖向反力值减小；随着支座水平刚度的增大，支座水平反力增大，而支座竖向反力减小。
Abstract:
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.
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