大跨度电缆支桥结构频率与环境因素的相关性分析基于支向量的回归
Jingye Xu1, Tugang Xiao1, Yu Liu1
1School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China.
Sensors (Basel, Switzerland)
|December 9, 2023
概括
桥梁结构频率主要受到温度的影响,而不是湿度. 这项研究使用了先进的方法来分析桥梁数据,为结构健康评估提供了洞察力.
科学领域:
- 结构工程 结构工程
- 环境监测 环境监测
- 土木工程 土木工程是指土木工程.
背景情况:
- 桥梁的动态特性对环境因素很敏感.
- 了解温度和湿度的影响对于结构健康评估至关重要.
研究的目的:
- 调查环境温度和湿度对京汉丹双岛桥的模态频率的影响.
- 建立一种可靠的方法,以在不同的环境条件下评估桥梁结构健康.
主要方法:
- 协变驱动的随机子空间识别 (SSI-COV) 用于识别模态频率.
- 相关性分析检查频率与温度和湿度的关系.
- 支持矢量机器回归 (SVR) 来模拟温度对频率的影响.
主要成果:
- 温度被确定为影响频率变化的主要因素,显示出强烈的线性相关性.
- 湿度与频率变化之间的相关性很小.
- 该SVR模型有效地根据温度预测频率,并提供可靠的装配余量.
结论:
- 温度显著影响桥梁模态频率,而湿度的影响微不足道.
- 开发的SVR模型准确地捕捉并预测温度诱导的频率变化.
- 在考虑温度影响后,分析后的频率数据的平滑显示,每日波动显著减少,提高了结构健康评估的准确性.
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