采用定长索设计的索网玻璃幕墙结构索长误差控制理论  

CONTROL METHOD OF CABLE LENGTH ERRORS IN CABLE NETS IN GLASS CURTAIN WALLS BY USING UN-ADJUSTABLE CABLE LENGTH DESIGN

作　　者：张旭乔[1] 郭彦林[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工程力学》2017年第6期28-40,共13页Engineering Mechanics

基　　金：国家自然科学基金面上项目(51378288);国家重点研发计划项目(2016YFC0701204)

摘　　要：单层索网结构体系目前已广泛应用于大尺度玻璃幕墙工程中。而将定长索设计的方法应用于其设计施工中,具有明显优势。在使用定长索设计时,索网玻璃幕墙中整索长度的准确性与节点连接的标定准确性都会影响张拉成形后各索的拉力及节点位形的精确度,进一步影响玻璃幕墙的位形及受力性能。该文首先分别讨论这两种索长误差影响的区别和联系,说明这两者均可转化为索段的索长误差以进行进一步研究。在此基础上,将两种索长误差结合,研究索段初始索长误差的敏感性。之后,应用概率论的相关理论,写出索段索长误差用整索索长误差和节点连接偏差表示的数学关系式,并给出不同施工方法下的不同表达关系。最后,综合应用可靠度理论及线性规划方法,提出整索长度误差和节点连接标定偏差的控制限值。研究成果给采用定长索设计的单层索网幕墙结构的索长误差控制提供指导。The cable net has been widely used in large-size glass curtain walls. It could save labors and costs to use un-adjustable cable length design in the construction of cable nets in glass curtain walls. In cable nets, the precision of the length of the whole cables and the accuracy of the segments of cables spaced by lock compressive blocks would both affect the configuration and structural performance. In this paper, the difference and relationship between the influences of these two factors are analyzed, and it indicates that both of these could transform to the length error of each cable segment. Based on this, the sensitivity analyses of cable length errors are conducted by considering these two factors together. Furthermore, the length errors of cable segments in different construction sequences are mathematically expressed by the whole cable length errors and the segment length deviation by probability theory. Finally, the control criteria of whole cable length errors and segment length deviations are proposed by using reliability theory and linear programming method. The results obtained will be used as a reference both in the design and in the construction of cable nets.

关 键 词：索网玻璃幕墙结构 控制限值 可靠度理论 定长索 整索长度误差 节点连接标定偏差 

分 类 号：TU394[建筑科学—结构工程] TU382