(兰州理工大学土木工程学院, 兰州 730050)

摘要: 为了研究大开口索承网格结构在施工过程中发生局部断索对整体结构的影响,以巴中体育中心为背景,考虑在 50%张拉完成、90%张拉完成及 100%张拉完成后出现局部断索对结构的影响. 运用瞬态动力学完全积分法及单元生死技术分析不同部位的径向索断裂后的结构响应,并对断索前后撑杆受力进行分析. 考虑一种以节点位移和索力变化量为基础的双因素重要性指标,来判断索的重要程度,并对其重要性排序. 结果表明:随着张拉阶段的进行,结构发生断索后的响应在逐渐增大,断索发生后会出现局部失效现象,但整体结构安全;一类索到三类索的重要性逐渐降低.

关键词: 大开口索承网格结构; 局部断索; 施工过程; 重要性指标

中图分类号:TU394 文献标志码:A 文章编号:1002-848X(2023)11-0130-07

DOI:10. 19701 / j. jzjg. 20201203

Analysis of cable breaking in construction of large opening cable supported grid structure

WANG Xiuli, WU Kaikai, ZHAO Xinlei

(School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

Abstract: In order to study the influence of local cable breaking on the whole structure during the construction of largeopening cable supported grid structure, taking Bazhong Sports Center as the background, the influence of local cablebreaking on the structure was considered after 50%, 90% and 100% tensioning completion. The transient dynamicintegration method and element birth and death technique were used to analyze the structural response after the radial cablewas broken in different parts, and the stress of the strut before and after the cable breaking was analyzed. A double factorimportance index based on the change of node displacement and cable force was considered to judge the importance degreeof cable and rank its importance. The results show that: with the progress of the tension stage, the response of the structureafter cable breaking is gradually increasing, and the local failure phenomenon will appear after the cable breaking, but theoverall structure is safe. The importance of the cable from the first type to the third type is gradually reduced.

Keywords:large opening cable supported grid structure; local cable breaking; construction process; importance index

∗国家自然科学基金(51778273).

第一作者:王秀丽,博士,教授,博士生导师,主要从事大跨度空间结构与钢结构领域的研究,Email:1135739056@ qq. com.

[引用本文] 王秀丽,吴凯凯,赵鑫磊. 大开口索承网格结构施工过程断索分析[J]. 建筑结构,2023,53(11):130-136,148. WANG Xiuli, WU Kaikai, ZHAO Xinlei. Analysis of cable breaking in construction of large opening cablesupported grid structure[J]. Building Structure,2023,53(11):130-136,148.