| 引用本文: | 李岩,崔石林,陈逸民.考虑模态更新的断索作用下斜拉桥动力响应分析方法[J].哈尔滨工业大学学报,2024,56(3):1.DOI:10.11918/202205002 |
| LI Yan,CUI Shilin,CHEN Yimin.Dynamic response analysis method of cable-stayed bridge under cable broken based on modal updating[J].Journal of Harbin Institute of Technology,2024,56(3):1.DOI:10.11918/202205002 |
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| 摘要: |
| 为了考虑斜拉桥拉索断索全过程特征和桥梁结构模态时变特性的影响,反映断索事故中斜拉桥结构动力响应的全过程特征,提出一种考虑断索过程模型和结构模态信息更新的突发断索作用下斜拉桥动力响应分析方法,利用数值模拟主要开展了依托斜拉桥桥例分析典型断索场景下桥梁的动力行为特征和研究断索持时对桥梁动力响应特征的影响规律的工作。结果表明:考虑断索过程特征的模态更新方法较不考虑的情况桥梁结构动力响应峰值增幅近10%,同时整体响应也出现略滞后现象；当不同部位单根主塔拉索断裂时,总结得到了全桥主梁结构动力响应较大类型及峰值位置；发现当断索持时大于结构基本周期时,结构动力放大系数变化较小且幅值接近于1.0；当断索持时为0.01~1.0倍结构基本周期时,随着持时缩短结构响应的动力放大系数变大直至峰值。研究结果可为同类桥型考虑突发断索的设计和事后结构评定提供借鉴和参考。 |
| 关键词: 斜拉桥 斜拉索 断索作用 模态更新 动力响应 |
| DOI：10.11918/202205002 |
| 分类号:U441.3 |
| 文献标识码:A |
| 基金项目:国家重点研发计划(2021YFB2600500) |
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| Dynamic response analysis method of cable-stayed bridge under cable broken based on modal updating |
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LI Yan1,CUI Shilin1,CHEN Yimin2
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(1.School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China; 2.School of Civil Engineering, Hunan University, Changsha 410082, China)
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| Abstract: |
| In order to consider the influence of the stayed cable breakage process characteristics and the time-varying characteristics of the bridge mode, and reflect the whole process characteristics of the structural dynamic response in the cable breaking accident, this paper proposes a dynamic response analysis method of the cable-stayed bridge under the action of the sudden cable-breaking process model and the structural modal information update strategy. Numerical simulation is mainly used to analyze the dynamic behavior characteristics of bridges under typical cable-stayed bridges and to study the influence of broken cables on the dynamic response characteristics of bridges when broken cables are held. The results show that the modal updating method considering the characteristics of cable breakage process increases the peak dynamic response of the bridge structure by nearly 10% compared to the case without considering it, and the overall response also shows a slight lag phenomenon; When a single main tower cable breaks in different parts, the types and peak positions of the dynamic response of the entire bridges main beam structure are summarized. It was found that when the duration of cable breakage is greater than the basic period of the structure, the dynamic amplification coefficient of the structure changes less and the amplitude approaches 1.0; When the suspension time is 0.011.0 times the basic period of the structure, the dynamic amplification coefficient of the structural response increases to its peak as the suspension time shortens. The research results can provide reference and guidance for the design and post structural evaluation of similar bridge types considering sudden cable breakage. |
| Key words: cable-stayed bridge stay-cables cable breaking action modal update the dynamic response |
