（中国民航大学机场学院， 天津 300300）

［摘要］杆件重要性识别是分析空间结构抗倒塌能力的重要途径之一。为识别空间杆系结构杆件重要性，基于能量法研究了损耗因子识别理论，分析了内部损耗因子和耦合损耗因子变化与结构杆件重要性的内在联系。进行了设有荷载缓和拉索的弦支穹顶室内模型破坏试验，通过记录阶跃荷载作用下杆件内力变化时程曲线和节点竖向位移，分析了内部损耗因子和耦合损耗因子随阶跃荷载的变化曲线以及对应的结构杆件重要性。结果表明，子系统损耗因子变化体现了空间杆系结构内力重分布变化的剧烈程度，反映了跳跃失稳破坏过程中的结构失效模式变化，子系统划分越细对结构杆件重要性的预测越准确。利用该方法也解释了弦支穹顶结构极限承载力提高、整体破坏倾向加大的现象。

［关键词］空间结构； 弦支穹顶； 杆件重要性； 能量法； 损耗因子

中图分类号：TU393-3文献标识码：A文章编号：1002-848X(2018)21-0066-06

Component importance analysis of suspend-dome structure based on the loss factor theory

Wu Zhiwei, Liu Guoguang, Shen Xiaojing, Gong Xiaoling, Yang Yuemin

(Airport College, Civil Aviation University of China, Tianjin 300300, China)

Abstract:Component importance identification is one of the important methods in analyzing anti-collapse capability of spatial structure. In order to identify the component importance of spatial structure, loss factor identification theory was analyzed based on energy method. The internal relationships between internal loss factor, coupling loss factor and structural component importance were discussed. Laboratory model destructive test of suspend-dome with load-relieving cable was carried out. Bar′s internal force time-history changes and node′s vertical displacement under step loading were recorded, and the curves of internal loss factor and coupling loss factor under step loading were obtained, by which the structural component importance of suspend-dome was discussed and predicted. The results show that the loss factor changes of substructure system reflect the condition of structural internal force redistribution, and also stand for the structural failure mode changes under the damage process of structural snap-through buckling. The prediction of structural component importance could be more accurate when the structure is divided into more substructure systems. The phenomenon of the increase of the ultimate bearing capacity and overall damage tendency of suspend-dome could be explained by the loss factor theory.

Keywords:spatial structure; suspend-dome; component importance; energy method; loss factor

*国家自然基金面上项目（51508557），中央高校基本科研业务费中国民航大学专项资助（3122018C016），机场工程科研基地开放基金项目。

作者简介：武志玮，博士，讲师，Email：zwwu@cauc.edu.cn。