张超, 付馨迪, 杜修力, 颜学渊, 许莉, 贾宏宇. 多重四边形环索-张弦穹顶局部断索冲击分析[J]. 工程力学, 2021, 38(1): 64-77. DOI: 10.6052/j.issn.1000-4750.2019.12.0781
引用本文: 张超, 付馨迪, 杜修力, 颜学渊, 许莉, 贾宏宇. 多重四边形环索-张弦穹顶局部断索冲击分析[J]. 工程力学, 2021, 38(1): 64-77. DOI: 10.6052/j.issn.1000-4750.2019.12.0781
ZHANG Chao, FU Xin-di, DU Xiu-li, YAN Xue-yuan, XU Li, JIA Hong-yu. DYNAMIC ANALYSIS OF MULTI-LOOP CABLE-STRING DOME DUE TO SUDDEN CABLE FAILURE[J]. Engineering Mechanics, 2021, 38(1): 64-77. DOI: 10.6052/j.issn.1000-4750.2019.12.0781
Citation: ZHANG Chao, FU Xin-di, DU Xiu-li, YAN Xue-yuan, XU Li, JIA Hong-yu. DYNAMIC ANALYSIS OF MULTI-LOOP CABLE-STRING DOME DUE TO SUDDEN CABLE FAILURE[J]. Engineering Mechanics, 2021, 38(1): 64-77. DOI: 10.6052/j.issn.1000-4750.2019.12.0781

多重四边形环索-张弦穹顶局部断索冲击分析

DYNAMIC ANALYSIS OF MULTI-LOOP CABLE-STRING DOME DUE TO SUDDEN CABLE FAILURE

  • 摘要: 多重环索-张弦组合屋盖为复杂的弦支穹顶结构。任一拉索瞬断均会对屋盖结构产生十分显著的动力冲击作用。针对多重环索-张弦穹顶屋盖的结构特点,提出基于AP法的断索冲击动力分析方法。针对断索失效路径、断索持续时间、结构阻尼比及屋盖初始荷载等参数开展敏感性分析,得到适用于多重环索-张弦屋盖的断索冲击动力分析的适用参数。剩余屋盖结构的动力分析结果表明:拉索瞬断冲击下,剩余屋盖的位移及内力响应均会不同程度地大于拉索静力失效,拉索瞬断引起的冲击效应不可忽视。而且,部分结构响应的动力放大系数会大显著大于规范所推荐的放大系数DAF=2.0。不同类型的拉索瞬断分析结果表明:同一重环索中任一拉索瞬断引起的动力效应大致相同;外环索瞬断引起的动力效应会显著大于其他拉索;虽然外环索和张弦索的瞬断均会引起较大的动力响应,但是两者的分布规律差异较大;多根拉索瞬断引起的动力响应并非总是大于单根拉索瞬断。

     

    Abstract: The multi-loop cable-string dome (MLSD) is a complex suspended-dome structure. Sudden failure of any cables will cause a very significant dynamic impact on MLSD. Based on the AP method, this study proposes a dynamic analysis method to analyze the dynamic response of MLSD due to sudden cable broken. The sensitive analysis of different parameters was conducted, such as failure paths, failure time, damping ratio and initial loadings. The ideal parameters suitable for MLSD are recommended. The dynamic analysis results show that: the displacement and internal force response of the remaining MLSD due to cable sudden broken will be greater than the cable slowly failure. The dynamic amplification factor should be seriously considered when suffered from cable sudden broken. Moreover, the dynamic amplification factor (DAF) of some responses will be larger than 2.0 recommended by current design codes. The discussion on displacement DAFs due to different cables sudden broken shows that the DAFs due to the sudden failure of any cables of the same loop are the same. The DAFs caused by sudden failure of cables on the outer loop will be significantly greater than that of other loops. Both DAFs due to cable failure of the outer loop and the string are significant, but the DAFs value distribution are quite different. The dynamic response caused by multiple cable breakages is not always greater than that of a single cable.

     

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