Camera-Based Vibration Measurement of the World War I Memorial Bridge in Portsmouth, New Hampshire
Camera-Based Vibration Measurement of the World War I Memorial Bridge in Portsmouth, New Hampshire
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DOI：
10.1061/(asce)st.1943-541x.0002203
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发表时间：
2018-11-01
影响因子：
4.1
通讯作者：
Buyukozturk, Oral
中科院分区：
文献类型：
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作者：
Chen, Justin G.;Adams, Travis M.;Buyukozturk, Oral
结构健康监测（SHM）是一种用于确定民用基础设施元件的结构完整性的方法，作为维护和维修协议的基础。这种监测依赖于收集来自安装在结构上的传感器的结构响应数据，由于在服务激励。安装还需要访问结构元件，电力和通信。使用摄像机进行位移远程测量的新方法可以大大简化仪器的过程，使SHM更容易实现许多结构。本文介绍了新罕布什尔州朴茨茅斯一战纪念桥的运动的远程相机测量，从80米以上的距离，一个垂直升降桥。通过测量桥跨冲击引起的位移来识别桥梁的振动频率和振型。由于在服务交通的桥梁位移也进行了测量。测量的信号与安装在桥上的加速度计和应变计的信号进行比较，并将桥的识别特征与有限元模型进行比较以进行验证。结果表明，应用摄像机测量和可视化结构的振动SHM的潜力。
Structural health monitoring (SHM) is a method for determining the structural integrity of civil infrastructure elements as a basis for maintenance and repair protocols. This monitoring depends on collecting structural response data from sensors installed on the structure due to in-service excitations. The installation additionally requires access to structural elements, power, and communication. New methods for remote measurement of displacements using video cameras could greatly simplify the process of instrumentation, making SHM much more attainable for many structures. This paper presents the remote camera measurement of the motions of the World War I Memorial Bridge in Portsmouth, New Hampshire, a vertical-lift bridge, from a distance of over 80m. Vibration frequencies and mode shapes of the bridge are identified by measuring the displacements due to the lift span impact. Displacement of the bridge due to in-service traffic is also measured. Measured signals are compared with those from accelerometers and strain gauges installed on the bridge, and identified characteristics of the bridge are compared with a finite-element model for verification. Results show the potential of applying video cameras to measure and visualize vibrations of structures in SHM.