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Structural performance of TH-Levy cable dome when
local component failure |
| XU Guo-jie1,ZHUO Xin1,SHOU Quan-gen2,QIU Li-ming2,FAN Feng3 |
1.College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China; 2.Zhejiang Zhancheng
Construction Group,Hangzhou 310005,China; 3. Keyi College, Zhejiang SciTech University, Hangzhou 310018, China |
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Abstract The structural performances of the new TH-Levy cable dome and the traditional Levy cable dome were analyzed when some components of ridge cable, diagonal cable, hoop cable or strut failed to work. The nonlinear finite element method was used to analyze the static performance of the two structures under fullspan load and half-span load. The Block Lanczos method was used to analyze the dynamic performance of the two structures. The analysis results showed that the upper hoop cables of the new cable dome can decrease structural deformations and component's internal forces when some components failed to work. Respectively, the new cable dome kept good static performance under design load, but the traditional cable dome completely lost structural bearing capacity when one ridge cable failed to work. The new cable dome was slightly better than the traditional cable dome in mechanical performance under design load when one diagonal cable failed to work. The new cable dome can retain parts of the structures to avoid collapse, but the traditional cable dome completely lost bearing capacity when one bottom hoop cable or strut failed to work. The natural frequencies of the new cable dome were greater than those of the traditional cable dome. Decreases of the natural frequencies of the new cable dome were less than those of the traditional cable dome when one ridge cable or diagonal cable failed to work. Results show that the dynamic performance of the new cable dome is better than that of the traditional cable dome.
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Published: 01 July 2011
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TH-Levy型索穹顶局部构件失效时的受力性能
对存在脊索、斜索、环索或撑杆等局部构件失效时的新型TH-Levy索穹顶和传统型Levy索穹顶进行受力性能研究.采用非线性有限元法对在满跨荷载和半跨荷载作用下2种类型结构的静力性能进行对比分析,采用Block Lanczos法对2种类型结构的动力性能进行对比分析.分析结果表明,新型索穹顶的上环索在控制结构内力分布的均匀性和减小结构变形上起着重要作用. 当单根脊索失效时,新型索穹顶在设计荷载作用下能够保持较好的受力性能,传统型索穹顶完全失去承载能力；当单根斜索失效时,新型索穹顶的受力性能略优于传统索穹顶,二者在设计荷载作用下均能保持较好的受力性能；当单根环索或撑杆失效时,新型索穹顶未失效的部分结构仍然具有承载能力,可以避免完全坍塌,传统索穹顶完全丧失承载能力；新型索穹顶完整结构的各阶自振频率大于传统型索穹顶,单根脊索或斜索失效时的各阶自振频率下降幅度均小于传统型索穹顶,表明新型索穹顶的动力性能和结构刚度优于传统型索穹顶．
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