某展览中心屋盖钢板带结构找形分析  

Form-finding analysis of stress-ribbon roof structure for an exhibition hall

作　　者：周平槐[1] 杨凯文[2] 

机构地区：[1]浙江省建筑设计研究院,杭州310006 [2]东南大学土木工程学院,南京211189

出　　处：《建筑结构》2017年第17期55-59,70,共6页Building Structure

摘　　要：国内某展览中心屋盖采用单层单向悬索结构,其中悬索用钢板带代替;定长悬索通过压重后变形而获得初始预应力。先通过单索抛物线理论确定符合建筑使用功能和美观效果的初始态以及相应屋面压重;然后结合施工方案,以初始态为基础,通过不断调整预起拱值的大小反推假定的零状态,进行施工全过程正分析,直到压重下悬索的变形位置达到建筑控制位置为止。结果表明,确定悬索零始态的关键在于边桁架张拉的水平距离和悬索的初始长度;通过试算确定的零状态模型,变形后悬索位置与建筑控制几何位置之间的差距满足预先设定的不大于10mm的要求;所采用的找形分析计算方法不仅能得到零状态以便施工放样,同时还可得到杆件相应初始内力,为分析屋盖结构承受其他外荷载提供条件。此外,还比较了典型节点的位置、典型构件的轴拉力随施工过程的变化规律。One-way monolayer suspension roof structure was adopted in an exhibition hall in China,and the cable structure was replaced by steel plate strip. The initial prestress on suspension cable with fixed length was obtained by deformation due to compression. The single cable parabolic theory was used to determine the initial state of the building that meets the building service function and the aesthetic effect as well as the corresponding roof weight. Then combined with the construction plan,with the initial state as the basis,pre-cambering value was continuously adjusted to deduce the assumed zero initial state to conduct the overall process analysis of construction until the deformation position of the suspension cable under heavy weight achieves the architectural control position. The results show that the key to determine the zero initial state of the suspension cable lies in the horizontal distance of side truss tension and initial length of suspension cable. The zero state model is determined through the trial,and the gap between suspension cable position after the deformation and geometric position of architectural control meet the preset requirement of no more than 10 mm. The adopted form-finding analysis method not only can obtain the zero state for construction layout,but also can get the corresponding initial internal force for the bars,which provide conditions for analyzing other load conditions of roof structure. In addition,the positions of the typical nodes and the changing laws of the tension of typical members with the construction process were also compared.

关 键 词：单层单向悬索结构 钢板带 单索抛物线理论 施工全过程分析 找形分析 

分 类 号：TU443[建筑科学—岩土工程]