在地震刺激下分析桥梁结构的振动特征
Ling'ai Li1, Shengxiang Huang1
1School of Geodesy and Geomatics, Wuhan University, Wuhan 430072, China.
Entropy (Basel, Switzerland)
|June 26, 2024
概括
一种新方法分析了地震事件期间的桥梁振动,显示了2006年恒春地震对苏通长江大桥的影响最小. 这种方法有助于评估结构性地震损坏.
科学领域:
- 结构工程 结构工程
- 地震学 地震学
- 信号处理 信号处理
背景情况:
- 桥梁容易受到来自地震波的结构振动的影响.
- 评估桥梁的安全性和稳定性需要分析这些振动特征.
研究的目的:
- 提出和验证一种新的信号时频特征提取方法 (NTFT-ESVD),用于分析地震刺激下的结构振动.
- 评估2006年恒春地震期间对苏通长江大桥的地震反应和影响.
主要方法:
- 开发了NTFT-ESVD方法,集成时间频率转换,单数值分解和信息.
- 模拟地震波响应,以测试该方法在频率,振幅和时间参数提取方面的准确性.
- 在恒春地震期间,分析了来自苏通长江大桥的真实地震数据.
- 通过与地震站数据进行比较,验证了地震波到达时间检测.
主要成果:
- 模拟显示NTFT-ESVD的高精度与较低的相对误差 (频率:1%,振幅:5.9%,时间:6%).
- 苏通长江大桥经历了短期冲击,振动幅度≤1厘米,频率≤0.2赫兹.
- 2006年恒春地震对桥梁的稳定性和安全性没有造成严重威胁.
- 验证了用于确定地震波到达时间的方法.
结论:
- 对于分析结构中的地震反应,NTFT-ESVD方法是可靠的.
- 动态GNSS监测与时间频率分析相结合,有效评估地震波对桥梁的影响.
- 这种方法有助于管理人员评估结构性地震损害.
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