Establishment of Infrastructure Monitoring System using High-accuracy Laser Dopper Vibrometers and its Application to Real Infrastructure

高精度激光多普勒测振仪基础设施监测系统的建立及其在实际基础设施中的应用

• 批准号: 16206047
• 负责人: FUJINO Yozo
• 金额: $ 28.79万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16206047/
• 关键词: Monitoring; 3D-motion; Laser scanning; Bridges; Inverse analysis; 三次元振動計測; レーザードップラー速度計; スキャン計測; 屋外実測; 室内実験

The objective of this research is to develop vibration measurement system using three laser Doppler vibrometers, which makes possible to measure three-dimensional behavior of an object high accurately and spatially high densely. At first, to validate the measurement principle, fundamental system was developed. Then, for the application to on-site measurement, three-dimensional vibration measurement system allowing a scanning and an arbitrary setting was developed. Because developed system can clarify the three-dimensional local deformation of structures caused by train/traffic-induced vibration, it can contribute to the preventive maintenance and the improvement of functionality in existing infrastructures.The developed system is applied to study the effect of train-induced vibrations and the train speed on local stresses at each part of the steel box girder bridge by field measurement. The measurement clarified the non-stationary dynamic response characteristics of a railway bridge subjected to train-induced vibrations. The data acquired were analyzed to identify the natural frequencies and the changes based on the retrofit in the mode shapes of the railway bridge. The results show that vibrations at the lower flange of the main girder increased the local stresses causing damage. Furthermore, the study shows that the vibration depends on the cyclic external load induced by train speed.

这项研究的目的是使用三个激光多普勒振动仪开发振动测量系统，这使得对物体的三维行为有可能准确和空间密集地测量物体的三维行为。首先，为了验证测量原理，开发了基本系统。然后，为了应用现场测量，开发了允许扫描和任意设置的三维振动测量系统。由于开发的系统可以阐明由火车/交通引起的振动引起的结构的三维局部变形，因此它可以有助于预防性维护和改善现有基础设施的功能。通过现场测量，在钢盒桥桥的每个部分的局部应力上引起的振动和火车速度。该测量阐明了受火车引起的振动的铁桥的非平稳动态响应特性。分析了所采用的数据，以识别铁路桥模式下的固有频率和基于改造的变化。结果表明，主大梁下部法兰的振动增加了局部应力，从而造成损坏。此外，研究表明，振动取决于火车速度引起的循环外部载荷。

项目成果

DEVELOPMENT OF THREE-DIMENSIONAL VIBRATION MEASUREMENT SYSTEM USING LASER DOPPLER VIBROMETERS

• 发表时间: 2005
• 作者: T. Miyashita;Y. Fujino

レーザー計測を用いた鋼鉄道橋の高速走行により発生する局部振動の把握と列車速度の影響

利用激光测量了解钢制铁路桥梁高速运行引起的局部振动以及列车速度的影响

• 发表时间: 2006
• 期刊: 土木学会論文集 投稿中
• 作者: 宮下剛;石井博典;藤野陽三;庄司朋宏;関雅樹
• 通讯作者: 関雅樹

Short-term and Long-term Health Monitoring Experience of a Short Highway Bridge

公路短桥近长期健康监测经验

• 发表时间: 2005
• 期刊: Journal of Bridge Structures Vol.1,No.1
• 作者: Yong Xia;Yozo Fujino;Masato Abe;Jun Murakoshi
• 通讯作者: Jun Murakoshi

レーザードップラー速度計を用いた動的外力の実験的同定

利用激光多普勒测速仪实验识别动态外力

• 发表时间: 2005
• 期刊: レーザードップラー速度計を用いた動的外力の実験的同定 No.787
• 作者: 藤野陽三;阿部雅人;Sakda CHAIWORAWITKUL
• 通讯作者: Sakda CHAIWORAWITKUL

Monitoring of Bridges and Transportation Infrastructure

桥梁和交通基础设施监测

• 发表时间: 2005
• 期刊: Prod.2^nd SHMII 論文集 Vol.1
• 作者: 黒木啓一郎;落合英俊;安福規之;大嶺聖;小林泰三;塩崎増仁;Yozo FUJINO
• 通讯作者: Yozo FUJINO