doi:10.3850/978-981-08-7619-7_P018

ABSTRACT

Structural health monitoring (SHM) using wireless smart sensor networks (WSSNs) has been recently received considerable public attention in the field of civil engineering. WSSNs have several attractive features such as on-board computational and wireless communication capabilities, so that the SHM system based on WSSNs can be low-cost, easy to install, and provide effective data management. In this study, WSSNs are realized using a dense array of smart wireless sensor nodes to construct a long-term SHM testbed on an in-service cable-stayed bridge located in Korea (i.e., the second Jindo Bridge). They consist of Imote2s, which are the most recent mote platforms developed by Intel and available at Crossbow, a custom-designed multi-metric sensor boards, base stations, and software provided by the Illinois Structural Health Monitoring Project (ISHMP) Services Toolsuite. In total, 70 wireless smart sensor nodes and two base stations have been deployed to capture the vibration of the bridge excited by traffic and wind loadings. A series of data analyses are performed in both of time and frequency domains. Modal properties of the bridge are identified based on the output-only measurements, and the results are compared with those obtained from the finite element model. It is demonstrated that the proposed WSSNs perform very effectively for SHM of the cable-stayed bridge.

Keywords: Wireless Smart Sensor Network, Structural Health Monitoring, Cable-stayed Bridge, Full-scale Implementation.

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