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人字形密肋网壳由密肋平板在脊线处相交构成.为了解网壳屋盖与下部结构在竖向荷载作用下的共同工作性能,基于位移法求解了屋盖的内力,采用有限元方法对比计算了点支承屋盖和整体结构屋盖的内力及变形.在此基础上考虑下部结构抗侧刚度、屋盖矢跨比和肋刚度的影响计算了25个算例.结果表明:顶层抗侧刚度和矢跨比是影响屋盖内力的主要因素,屋盖轴力和矢跨比呈非线性关系;屋盖具有较强的拱向传力性质,脊线类似于拱的系杆;与点支承屋盖相比,共同工作使横隔下弦的内力明显增大,并引起下部楼盖轴力,且屋盖边梁应按双偏心受力构件计算承载力;顶层采用异型柱是调整屋盖内力分布的有效措施,当异型柱演化为短肢剪力墙时,建议墙肢长度取屋盖一个投影网格长度;增大矢跨比有利于降低屋盖挠度,屋盖内力分布对矢跨比较为敏感,矢跨比不宜低于1/6;过大的肋刚度对提高屋盖整体承载力意义不大,肋截面高度可取屋盖跨度的1/40~1/50.
Herringbone densely-spaced esophageal ribbed shell is formed by intersecting ribbed plate at the ridge line.In order to understand the common working performance of reticulated shell roof and substructure under vertical load, the internal force of roof is solved based on displacement method, Methods The internal forces and deformations of the point-supported roof and the whole structure roof were calculated and compared. Based on the above results, 25 examples were calculated considering the lateral stiffness of the superstructure, the spanwise ratio of the roof and the stiffness of the roof. The results show that: Lateral stiffness and ratio of span to span are the main factors that affect the internal force of the roof. The axial force and the ratio of roof to span of the roof are nonlinear. The roof has a strong arch-to-wall force and the ridges are similar to those of arch. Compared with the point support roof, work together to significantly increase the internal force of the bottom chord and cause the axial force of the lower floor, and the roof girder should be double eccentric load bearing capacity components; the top is shaped column is to adjust When the special-shaped column evolves into the short-limbed shear wall, it is suggested that the length of the wall-length be taken as a projected grid length of the roof. Increasing the ratio of roof-to-span will help to reduce the deflection of the roof, Cross-sensitive, cross-ratio should not be less than 1/6; too Large rib stiffness to improve the overall bearing capacity of little significance, the rib section height desirable roof span 1/40 ~ 1/50.