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台风“凤凰”期间苏通斜拉桥的全尺寸测量与系统识别

Full-scale measurements and system identification on Sutong cable-stayed bridge during Typhoon Fung-Wong.

作者信息

Wang Hao, Tao Tianyou, Guo Tong, Li Jian, Li Aiqun

机构信息

Key Laboratory of C&PC Structures of Ministry of Education, Southeast University, No. 2 Sipailou, Nanjing 210096, China.

School of Civil Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China.

出版信息

ScientificWorldJournal. 2014;2014:936832. doi: 10.1155/2014/936832. Epub 2014 Jun 3.

DOI:10.1155/2014/936832
PMID:24995367
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4065720/
Abstract

The structural health monitoring system (SHMS) provides an effective tool to conduct full-scale measurements on existing bridges for essential research on bridge wind engineering. In July 2008, Typhoon Fung-Wong lashed China and hit Sutong cable-stayed bridge (SCB) in China. During typhoon period, full-scale measurements were conducted to record the wind data and the structural vibration responses were collected by the SHMS installed on SCB. Based on the statistical method and the spectral analysis technique, the measured data are analyzed to obtain the typical parameters and characteristics. Furthermore, this paper analyzed the measured structural vibration responses and indicated the vibration characteristics of the stay cable and the deck, the relationship between structural vibrations and wind speed, the comparison of upstream and downstream cable vibrations, the effectiveness of cable dampers, and so forth. Considering the significance of damping ratio in vibration mitigation, the modal damping ratios of the SCB are identified based on the Hilbert-Huang transform (HHT) combined with the random decrement technique (RDT). The analysis results can be used to validate the current dynamic characteristic analysis methods, buffeting calculation methods, and wind tunnel test results of the long-span cable-stayed bridges.

摘要

结构健康监测系统（SHMS）为在现有桥梁上进行全尺寸测量提供了一种有效工具，用于桥梁风工程的基础研究。2008年7月，台风“风神”袭击中国，侵袭了中国的苏通斜拉桥（SCB）。在台风期间，进行了全尺寸测量以记录风数据，并通过安装在苏通斜拉桥上的结构健康监测系统收集结构振动响应。基于统计方法和频谱分析技术，对测量数据进行分析以获得典型参数和特征。此外，本文分析了测量的结构振动响应，并指出了斜拉索和桥面板的振动特性、结构振动与风速之间的关系、上下游斜拉索振动的比较、斜拉索阻尼器的有效性等。考虑到阻尼比在减振中的重要性，基于希尔伯特-黄变换（HHT）结合随机减量技术（RDT）识别了苏通斜拉桥的模态阻尼比。分析结果可用于验证大跨度斜拉桥当前的动力特性分析方法、抖振计算方法和风洞试验结果。

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