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(蘭州理工大學(xué)土木工程學(xué)院, 蘭州 730050)
摘要: 為了研究大開口索承網(wǎng)格結(jié)構(gòu)在施工過程中發(fā)生局部斷索對整體結(jié)構(gòu)的影響,以巴中體育中心為背景,考慮在 50%張拉完成、90%張拉完成及 100%張拉完成后出現(xiàn)局部斷索對結(jié)構(gòu)的影響. 運(yùn)用瞬態(tài)動力學(xué)完全積分法及單元生死技術(shù)分析不同部位的徑向索斷裂后的結(jié)構(gòu)響應(yīng),并對斷索前后撐桿受力進(jìn)行分析. 考慮一種以節(jié)點(diǎn)位移和索力變化量為基礎(chǔ)的雙因素重要性指標(biāo),來判斷索的重要程度,并對其重要性排序. 結(jié)果表明:隨著張拉階段的進(jìn)行,結(jié)構(gòu)發(fā)生斷索后的響應(yīng)在逐漸增大,斷索發(fā)生后會出現(xiàn)局部失效現(xiàn)象,但整體結(jié)構(gòu)安全;一類索到三類索的重要性逐漸降低.
關(guān)鍵詞: 大開口索承網(wǎng)格結(jié)構(gòu); 局部斷索; 施工過程; 重要性指標(biāo)
中圖分類號:TU394 文獻(xiàn)標(biāo)志碼:A 文章編號: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
∗國家自然科學(xué)基金(51778273).
第一作者:王秀麗,博士,教授,博士生導(dǎo)師,主要從事大跨度空間結(jié)構(gòu)與鋼結(jié)構(gòu)領(lǐng)域的研究,Email:1135739056@ qq. com.
[引用本文] 王秀麗,吳凱凱,趙鑫磊. 大開口索承網(wǎng)格結(jié)構(gòu)施工過程斷索分析[J]. 建筑結(jié)構(gòu),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.
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