- 摘 要
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（中國民航大學機場學院， 天津 300300）
［摘要］桿件重要性識別是分析空間結(jié)構(gòu)抗倒塌能力的重要途徑之一。為識別空間桿系結(jié)構(gòu)桿件重要性，基于能量法研究了損耗因子識別理論，分析了內(nèi)部損耗因子和耦合損耗因子變化與結(jié)構(gòu)桿件重要性的內(nèi)在聯(lián)系。進行了設(shè)有荷載緩和拉索的弦支穹頂室內(nèi)模型破壞試驗，通過記錄階躍荷載作用下桿件內(nèi)力變化時程曲線和節(jié)點豎向位移，分析了內(nèi)部損耗因子和耦合損耗因子隨階躍荷載的變化曲線以及對應(yīng)的結(jié)構(gòu)桿件重要性。結(jié)果表明，子系統(tǒng)損耗因子變化體現(xiàn)了空間桿系結(jié)構(gòu)內(nèi)力重分布變化的劇烈程度，反映了跳躍失穩(wěn)破壞過程中的結(jié)構(gòu)失效模式變化，子系統(tǒng)劃分越細對結(jié)構(gòu)桿件重要性的預(yù)測越準確。利用該方法也解釋了弦支穹頂結(jié)構(gòu)極限承載力提高、整體破壞傾向加大的現(xiàn)象。
［關(guān)鍵詞］空間結(jié)構(gòu)； 弦支穹頂； 桿件重要性； 能量法； 損耗因子
中圖分類號：TU393-3文獻標識碼：A文章編號：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
*國家自然基金面上項目（51508557），中央高?；究蒲袠I(yè)務(wù)費中國民航大學專項資助（3122018C016），機場工程科研基地開放基金項目。
作者簡介：武志瑋，博士，講師，Email：zwwu@cauc.edu.cn。
