大跨度弦支穹顶结构的静力特性及施工仿真分析

发布时间：2019-05-16 05:28

【摘要】：弦支穹顶是由上部单层网壳和下部索杆体系组合而成的新型杂交空间结构体系。由于其下部索杆体系的引入,从而使上部单层网壳的稳定性与整体刚度得到加强。该体系对边界约束要求较低,且造型美观、新颖,设计、施工难度相对索穹顶较小因而具有广阔的应用前景。本文在总结已有研究成果的基础上,结合某体育馆实际工程,对大跨度椭圆形弦支穹顶结构进行了较系统的研究。主要工作如下:1.对大跨度椭圆形弦支穹顶结构的静力性能进行了计算分析。对比了弦支穹顶与相应单层网壳在荷载作用下的结构变形、构件内力等静力特性,并考虑了改变矢跨比对弦支穹顶静力性能的影响。2.对椭圆形弦支穹顶和相应单层网壳的非线性屈曲性能进行对比研究。考虑几何非线性、材料弹塑性、初始几何缺陷及活载半跨布置,考察了最不利屈曲模态的选取和初始几何缺陷值的改变等对弦支穹顶稳定承载力的影响规律。在此基础上,对不同矢跨比弦支穹顶的稳定性能进行了研究。3.对4种不同施工方案下结构的节点位移、杆件内力计算结果进行比较,分析了不同的张拉顺序和张拉控制应力对结构响应的影响。在此基础上,确定出较为合理的施工方案。综上所述,本文针对某椭圆形弦支穹顶实际工程,对其静力性能及稳定性进行了较深入地研究,并与相应的单层网壳进行了对比。探讨了不同施工仿真分析方案的合理选取问题。
[Abstract]:Chord Dome is a new hybrid spatial structure system, which is composed of upper single-layer reticulated shell and lower cable-bar system. Due to the introduction of the lower cable-bar system, the stability and overall stiffness of the upper single-layer reticulated shell are strengthened. The system has low requirements for boundary constraints, beautiful shape, novel design and less difficulty in construction than cable domes, so it has a broad application prospect. On the basis of summing up the existing research results and combining with the actual project of a gymnasium, this paper makes a systematic study on the structure of long-span elliptical chord branch domes. The main work is as follows: 1. The static performance of long-span elliptical chord Dome structure is calculated and analyzed. The static characteristics such as structural deformation and internal force of members under load are compared between chord-supported domes and corresponding single-layer reticulated shells, and the influence of changing rise-span ratio on static performance of chord-supported domes is considered. 2. The nonlinear buckling behavior of elliptical chord-supported domes and corresponding single-layer reticulated shells is compared. Considering geometric nonlinear, material elastoplasticity, initial geometric defects and live load half span arrangement, the effects of the selection of the most unfavorable buckling modes and the change of initial geometric defects on the stable bearing capacity of chord domes are investigated. On this basis, the stability of chord domes with different rise-span ratios is studied. The calculation results of joint displacement and internal force of members under four different construction schemes are compared, and the effects of different tension sequence and tension control stress on the structural response are analyzed. On this basis, a more reasonable construction scheme is determined. To sum up, the static performance and stability of an elliptical chord Dome are deeply studied in this paper, and compared with the corresponding single-layer reticulated shell. The reasonable selection of different construction simulation analysis schemes is discussed.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU399

【相似文献】