大型跨海桥梁的船撞风险评估、智能监控与安全防护研究
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1.跨海大桥实测风场特性分析
- 关键词:
- 海域环境;风场特性;健康监测;斜拉索
- 朱绪江;郭健;畅卫杰;刘舟峰
- 《2019世界交通运输大会》
- 0年
- 中国北京
- 会议
风场特性实测分析对于实际结构的振动分析具有重大意义,针对位于海域环境下的金塘大桥实测数据,采用统计和频谱分析的方法对桥址处风场参数及拉索风雨激振进行研究。研究结果表明:舟山海域的无量纲幂指数与强风作用下小于规范建议值,而顺风向湍流度大于规范值,桥址处顺风向和竖向脉动紊流功率谱与桥规所采取的风谱相比在低频处偏低,高频处偏高。主跨长索由于采用了螺旋线,表面凹坑以及阻尼器,拉索风雨激振得到有效控制,但仍需注意由于较高的紊流度而引起高阶涡激振动的几率增大。
...2.基于多源监测的杭州湾跨海大桥冲刷监测系统
- 关键词:
- 桥梁工程;冲刷深度;实时监测;跨海桥梁
- 蒋兵;郭健;王金权;吴继熠;李最森;穆锦斌
- 《中国公路学会养护与管理分会第十一届学术年会》
- 0年
- 中国江苏南京
- 会议
跨海桥梁基础局部冲刷问题严重,已成为大桥运营的潜在安全隐患。因此,准确监测桥梁桩基周围的冲刷深度在海洋工程中具有重要的意义。在现有的监测方法中,监测仪器受海域潮流地形复杂、悬沙浓度高、装置安装困难等因素影响,能够在海洋环境下开展桥梁冲刷实时监测的方法较少。本研究通过多个监测设备的相互偶联进行动态采集桩侧数据,形成多源桥梁局部冲刷实时感知监测系统,实现了冲刷界面、海床泥沙冲淤、潮汐实时变化的一体化监测。以杭州湾跨海大桥海中平台区域的ZD18号匝道桥墩为例,通过Flow-3d数值仿真技术,确定迎流侧桥梁桩基冲刷发展最大位置,利用研发的多源冲刷监测系统,实现了桥墩局部冲刷定点实时动态监测,该方法能够在恶劣的海洋环境中稳定正常工作,为跨海大桥管理及养护提供了参考价值。
...3.单向流及往复流作用下桩基局部冲刷研究
- 关键词:
- 群桩;局部冲刷;数值仿真;单向流;往复流
- 翁博文;郭健;吴继熠
- 《世界交通运输工程技术论坛(WTC2021)》
- 0年
- 中国陕西西安
- 会议
局部冲刷是导致桥梁水毁的主要原因,研究桥梁桩基在单向流及往复流作用下局部冲刷特征具有重要意义。本文将通用数值模拟方法的结果与Melville经典冲刷试验的结果进行了比较,以验证该方法的有效性。基于实测数据和有效的数值模拟方法,建立了一座实桥的群桩模型,对单向流和潮流作用下桩周流场和冲刷特性进行了对比分析。研究发现:(1)单向流条件下冲刷坑表现出前冲后淤,往复流作用下冲刷坑的前后区域均表现出冲刷,且冲刷坑的范围大于单向流。(2)往复流条件下最大冲刷深度较单向流缩减了20%~30%。
...4.Analysis of wind induced vibration of stayed cable of sea-crossing bridge based on monitoring data
- 关键词:
- Monitoring;Spectral density;Vibration analysis;Anemometers;Turbulence;Cables;Hurricanes;Wind speed;Buffeting;Cable stayed bridges;Acceleration sensors;Acceleration-time history;Different frequency;High frequency bands;Real-time health monitoring;Turbulence intensity;Wavelet multi-scale;Wind induced vibrations
- Guo, J.;He, J.X.;Hu, C.J.;Wu, J.Y.
- 《16th East Asian-Pacific Conference on Structural Engineering and Construction, 2019》
- 2021年
- December 3, 2019 - December 6, 2019
- Brisbane, QLD, Australia
- 会议
Based on the real-time health monitoring system, the wind field changes and cable vibration at Jintang Bridge site were continuously observed by using a three-dimensional supersonic anemometer, propeller anemometers, and acceleration sensors on cable. The work presented in this paper focuses on the characteristics of wind speed and wind direction, turbulence intensity and power spectral density of fluctuating wind during typhoon Canhong are analyzed. In addition, the acceleration time history data are decomposed and recomposed in different frequency bands based on wavelet multi-scale analysis, and the characteristics of wind field variation and frequency band distribution of wind-induced cable vibration energy are obtained. The results show that there is a strong correlation between turbulence intensity along wind direction and across wind direction. The root mean square acceleration of cables during typhoon landfall is more than 5 times of normal, and vibration energy is mainly distributed in high frequency band. © Springer Nature Singapore Pte Ltd. 2021.
...5.基于多源监测的杭州湾跨海大桥冲刷监测系统
- 关键词:
- 桥梁工程;冲刷深度;实时监测;跨海桥梁
- 蒋兵;郭健;王金权;吴继熠;李最森;穆锦斌
- 《中国公路学会养护与管理分会第十一届学术年会》
- 0年
- 中国江苏南京
- 会议
跨海桥梁基础局部冲刷问题严重,已成为大桥运营的潜在安全隐患。因此,准确监测桥梁桩基周围的冲刷深度在海洋工程中具有重要的意义。在现有的监测方法中,监测仪器受海域潮流地形复杂、悬沙浓度高、装置安装困难等因素影响,能够在海洋环境下开展桥梁冲刷实时监测的方法较少。本研究通过多个监测设备的相互偶联进行动态采集桩侧数据,形成多源桥梁局部冲刷实时感知监测系统,实现了冲刷界面、海床泥沙冲淤、潮汐实时变化的一体化监测。以杭州湾跨海大桥海中平台区域的ZD18号匝道桥墩为例,通过Flow-3d数值仿真技术,确定迎流侧桥梁桩基冲刷发展最大位置,利用研发的多源冲刷监测系统,实现了桥墩局部冲刷定点实时动态监测,该方法能够在恶劣的海洋环境中稳定正常工作,为跨海大桥管理及养护提供了参考价值。
...6.Analysis of wind induced vibration of stayed cable of sea-crossing bridge based on monitoring data
- 关键词:
- Monitoring;Spectral density;Vibration analysis;Anemometers;Turbulence;Cables;Hurricanes;Wind speed;Buffeting;Cable stayed bridges;Acceleration sensors;Acceleration-time history;Different frequency;High frequency bands;Real-time health monitoring;Turbulence intensity;Wavelet multi-scale;Wind induced vibrations
- Guo, J.;He, J.X.;Hu, C.J.;Wu, J.Y.
- 《16th East Asian-Pacific Conference on Structural Engineering and Construction, 2019》
- 2021年
- December 3, 2019 - December 6, 2019
- Brisbane, QLD, Australia
- 会议
Based on the real-time health monitoring system, the wind field changes and cable vibration at Jintang Bridge site were continuously observed by using a three-dimensional supersonic anemometer, propeller anemometers, and acceleration sensors on cable. The work presented in this paper focuses on the characteristics of wind speed and wind direction, turbulence intensity and power spectral density of fluctuating wind during typhoon Canhong are analyzed. In addition, the acceleration time history data are decomposed and recomposed in different frequency bands based on wavelet multi-scale analysis, and the characteristics of wind field variation and frequency band distribution of wind-induced cable vibration energy are obtained. The results show that there is a strong correlation between turbulence intensity along wind direction and across wind direction. The root mean square acceleration of cables during typhoon landfall is more than 5 times of normal, and vibration energy is mainly distributed in high frequency band.© Springer Nature Singapore Pte Ltd. 2021....
