三铰拉梁式肋环型索穹顶结构受力性能研究  

Mechanical performance study of three joints tension-beam Geiger type cable dome structure

作　　者：罗斌[1,2] 丁明珉 潘杰 郭正兴[1,2] 阮杨捷[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]东南大学国家预应力工程技术研究中心,江苏南京210096 [3]无锡市建筑设计研究院有限责任公司,江苏无锡214001

出　　处：《建筑结构学报》2016年第11期61-67,137,共8页Journal of Building Structures

基　　金："十二五"国家科技支撑计划(2012BAJ03B06);国家自然科学基金项目(51308105);江苏高校优势学科建设工程项目;2014年度江苏省研究生培养创新工程项目(KYLX_0152)

摘　　要：按照刚性脊索穹顶结构的思路,将常规肋环型索穹顶中的脊索替换为三铰拉梁,提出了一种三铰拉梁式肋环型索穹顶结构。制作了1个直径为6 m的三铰拉梁式肋环型索穹顶结构模型,对其张拉成型过程和不同静力荷载作用下的结构响应进行了数值模拟和试验研究。结果表明:张拉成型过程中,斜索和环索的索力逐渐增大,拉梁局部变形逐渐减小,结构整体由存在较大平面外偏移的松弛状态逐渐刚化成型;竖向荷载作用下,三铰拉梁式肋环型索穹顶整体变形较小,拉梁中铰局部变形是预应力设计和位移控制的关键;结构整体为柔性空间体系,对非对称荷载作用较为敏感;卸载后,结构可以恢复初始的形状与内力,呈现弹性特征。有限元模型可以较好地模拟结构在张拉成型和加载过程中的位形和受力规律,可用于三铰拉梁式肋环型索穹顶结构的受力性能分析。Based on the idea of rigid ridge-cable dome structure, a new structure called three joints tension-beam Geiger type cable dome, which replaces the ridge cables of traditional Geiger domes with three joints, tension-beams was proposed. A scaled model with the diameter of 6 meters was manufactured, the numerical simulation and an experimental study on form-finding construction and structural responses in different load-cases was conducted. The result shows that during forming process, the forces of cables gradually increase and the local deformations of tension- beams decrease gradually as well. The whole structure changes from the initial relaxed state, which includes large out- of-plane displacement, to the designed state. Furthermore, under vertical loads, the overall displacement of three joints tension-beam cable dome is small, and the local deformation of mechanism joints which are located on tension- beams is the key point of pretension designing and displacement controlling. Furthermore, three joints tension-beam Geiger type cable dome is a kind of flexible space system, which is sensitive to asymmetric loads. After unloading, the structure restores its original shape and force, which presents the elastic characteristic. The variations of the deformation and stress can be illustrated by the numerical analysis accurately, and the numerical simulation can be utilized to perform mechanical analysis of three joints tension-beam cable dome structure.

关 键 词：肋环型索穹顶 三铰拉梁 张拉施工成型 静力试验 受力性能 

分 类 号：TU393.303[建筑科学—结构工程]