拉索预应力巨型网格结构布索形式研究  

Research on Arrangement Styles of Cables for Prestressed Reticulated Mega-structures

作　　者：贺拥军[1] 王继新[1] 周绪红[2] HE Yongjun WANG Jixin ZHOU Xuhong(College of Civil Engineering,Hunan University,Changsha 410082,China College of Civil Engineering, Chongqing University, Chongqing 400044, China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]重庆大学土木工程学院,重庆400044

出　　处：《湖南大学学报（自然科学版）》2017年第7期1-6,共6页Journal of Hunan University:Natural Sciences

基　　金：国家重点研发计划项目(2016YFC0701201);湖南省高校科技创新团队计划资助项目[湘财教指(2015)616号]~~

摘　　要：针对由预应力和巨型网壳结构组合而成的一种超大跨度拉索预应力空间结构体系,总结了该结构体系已提出的两种预应力布置形式的索杆布置原则、受力机理、具体形式与几何拓扑关系;并在此基础上提出两种改进型拉索预应力布索形式.通过与已提出的两种布索形式及未布索桁架拱进行对比分析,初步研究了改进型布索形式下立体桁架拱的静力及稳定性能.对比指标包括结构最大位移、支座水平反力、杆件内力峰值、结构稳定极限承载力及失稳模态等5个方面.分析结果表明,两种改进型布索形式的引入均可有效地提高桁架拱的结构刚度,改善结构的静力性能,并能较大地提高其稳定承载力,同时还能改善已有布索形式的缺陷,是较合理的索杆布置;其中第2种改进型布索形式的综合性能更好,是一种更有效的布索形式.In terms of the prestressed spatial structure system consisted of prestressed and giant reticu- lated shell structure, the arrangement principle of cables and struts, force mechanism, configuration and to- pological relations for existing two types of cable-strut arrangements were summarized.Based on the above analysis, two improved kinds of cable-strut arrangement schemes were put forward. Through the comparison of the structures with the existing two types of cable-strut arrangements and the corresponding non-pretensioned truss arch in five aspects including maximum displacement, horizontal reaction force, peak value of member internal force, ultimate load and buckling mode, the static performance and stability of the truss arches, the responses of two improved cable-strut arrangement schemes were studied.The results indicate that the structural rigidity, static performance and stability of truss arches can be effectively improved for the introduction of improved cable-strut arrangement schemes.Additionally, the defects of the existing two types can be ameliorated, which demonstrates the reasonable arrangements of the cables and struts in the two improved schemes.Comparatively, the second improved scheme had optimized comprehensive performance,and it is more efficiency.

关 键 词：拉索预应力巨型网格结构 布索形式 静力性能 稳定承载力 屈曲模态 

分 类 号：TU393.3[建筑科学—结构工程]