不同支承条件对复合式索穹顶静力性能影响研究  

Static performance of composite cable dome under different supporting conditions

作　　者：陈志华[1] 楼舒阳 闫翔宇[2] 韩芳冰 马青[1] CHEN Zhi-hua;LOU Shu-yang;YAN Xiang-yu;HAN Fang-bing;MA Qing(School of Civil Engineering, Tianjin University, Tianjin 300072, China;Architectural Design and Research Institute, Tianjin University, Tianjin 300072, China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学建筑设计研究院,天津300072

出　　处：《空间结构》2018年第2期13-20,共8页Spatial Structures

基　　金：国家自然科学基金项目(51478310);天津市建委科技项目(2014-03);住房城乡建设部科学技术项目(2016-k5-062)

摘　　要：以天津理工大学体育馆工程为背景,对大跨度复合式索穹顶进行支承条件的研究,对比了不同环梁形式和约束条件对索穹顶静力性能的影响.建立了混凝土环梁、钢环梁、箱形截面混凝土环梁三种形式的模型,考虑三向铰接、柱对环梁弹簧刚度和与下部结构协同工作三种约束条件,得到不同支承下索穹顶结构变形、杆件预应力损失和环梁反力变化的基本规律.研究表明：一定范围内混凝土环梁截面积的变化会影响切向应力,轴向应力不变;钢环梁建筑效果好,但变形大,下弦单排约束最不利;环梁截面尺寸较大时,箱形截面梁能显著减轻自重,经济性好;和上下部结构协同工作模型相比,三向铰接约束会使设计偏于危险.Based on the gymnasium of Tianjin University of Technology,this paper studied the supporting conditions of large-span composite cable dome,and compared the influence of different ring beam forms and restraint conditions on the static performance of the cable dome.Three models of concrete ring beam,steel ring beam and box concrete ring beam were established,and three kinds of constraints were considered, namely three-way hinge,spring stiffness of column and cooperative working with substructure.The basic regular of the deformation of dome structure,the prestress loss of the cable and the reaction force of the ring beam were obtained.Results show that the variation of the cross-sectional area of the concrete ring beam will affect the tangential stress,but it will not affect the axial stress.The steel ring beam has great architectural effect,but the deformation is large.The form of single-row constraint is the most harmful.When the section size of the ring beam is large enough,box beam can significantly reduce the dead weight,and is more cost effective.Compared with the cooperative working model,the three-way hinge restraint model tends to bring risks to the design.

关 键 词：复合式索穹顶 支承条件 静力性能 环梁形式 约束条件 

分 类 号：TU393.3[建筑科学—结构工程]