拉索预应力折线型立体桁架拱布索方案研究  

Research on the Arrangement Styles of Cables for Pretensioned Folded Line Type 3D-trussed Arch

作　　者：贺拥军[1] 章小桐[1] 周绪红[1,2] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]兰州大学土木工程与力学学院,甘肃兰州730000

出　　处：《湖南大学学报（自然科学版）》2011年第8期7-12,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50508013);湖南省杰出青年基金资助项目(08JJ1006);教育部新世纪优秀人才资助项目(NCET-2007-0266);'十一五'国家科技支撑计划重点资助项目(2006BAJ18B06-01)

摘　　要：针对折线型立体桁架拱结构,提出了4种拱平面内的布索方案,研究了4种方案下预应力拱结构的静力及稳定性能,分别从结构位移的减小、索初始预拉力值的高低、水平支反力的降幅、杆件内力分布的均匀性及结构稳定性的提高5个方面与未布索立体桁架拱作了综合对比.结果表明,按照桁架拱在极限荷载作用下的屈曲形态布置撑杆拉索能够最有效地改善拱的静力性能,提高其稳定极限承载力.另外,由对预应力桁架拱的失稳模态分析发现,拉索通过撑杆对结构施加预应力能更有效地约束结构的整体变形.For the folded line type three-dimensional （3D） trussed arches, four arrangement styles of cables in the arch plane were presented. The static and stability property of the pretensioned 3D trussed arch in those four arrangement styles was studied. The numerical results including the decrease in struc- tural displacement, the initial tensile force of cables, the reduction in horizontal reaction force, the uni- formity of distribution of member forces and the improvement of structural stability were compared with those of the corresponding 3D-trussed arch, and it has been shown that the mechanical properties of the arch can be greatly improved with the arrangement style where the struts and cables were arranged accord- ing to the buckling shape of the arch subjected to the ultimate load. In addition, the analysis results o[ the instability modes of the pretensioned 3D-trussed arch indicate that the global deformation of the arch can be controlled effectively by introducing struts to the prestressing system.

关 键 词：静力性能 拉索预应力 折线型立体桁架拱 布索方案 稳定极限承载力 失稳模态 

分 类 号：TU356[建筑科学—结构工程]