大跨度拉索预应力带肋单层球面网壳的稳定性及应用研究

大跨度预应力带肋单层球面网壳结构的稳定性在设计中起着控制作用,尤其是各种因素(例如矢跨比、布索方式、缺陷及加载方式等)对该结构稳定性的影响还有待深入研究,目前研究多集中在中小跨度的带肋网壳结构动力或稳定性方面。该文对K6型和K8型110m拉索预应力带肋单层球面网壳的稳定性进行了较系统研究。分析了四种不同矢跨比、两种布索方案、四种初始缺陷和三种加载方式等因素对稳定性的影响;得到了不同因素对结构稳定性影响的关系曲线,找出了最优布索方案和矢跨比,并与天津市体育中心体育馆进行结构性能和耗钢量比较,结果表明:该结构形式能充分发挥材料性能,提高了极限承载力,与原结构相比节省了25.7%的钢材,经济效益显著,对于将来工程实践具有参考和指导意义。

APPLICATION AND STABILITY STUDY ON LARGE SPAN PRESTRESSED SINGLE-LAYAR SPHERICAL SHELL WITH RIBS

The stability of the shell plays a leading role in the design of large span pre-stressed single-layer spherical lattice shells with ribs. The stability is governed by many kinds of factors (for instance, different rise-span ratio, distributing cables layout, defects and distributing loads manner) that are needed to be further researched. The dynamic performance and stability of middle and short span shell with ribs have been investigated at present. Hence the stability of 110m’s K6, K8 pre-stressed cable single-layer spherical lattice shell has been systematically studied. The factors, four kinds of the rise-span ratio, two kinds of distributing cables layout, four kinds of initial defects, three kinds of distributing loads manners and so on, have been analyzed. The curves of different factors’ effect to stability have been drawn. And the optimization of distributing cable layout and the rise-span ratio have been found out, the structural performance and steel consumption of Tianjin Sports Center were compared to optimized shell. The results indicate that the characteristics of the shell have been brought into full play and ultimate capacity is improved, saving the steel of 25.7% compared to former structure. Consequently, the economic benefit is remarkable, so it can be applied to future practical project.