Cable force is one of the most important parameters of cable-stayed bridge. Since cable system carries most of selfweight
of the bridge, the loss of cable force could significantly reduce load carrying capacity of the bridge. This study
presents a hybrid structural health monitoring (SHM) method for cable-anchorage system of cable-stayed bridge using
smart sensor and interface. The following approaches are carried out to achieve the objective. Firstly, a hybrid SHM
method is newly designed for tension force monitoring in cable-anchorage system. In the method, vibration response of
cable is utilized for tension force monitoring of global cable, and impedance response of anchorage is utilized to detect
tension force change of local tendon. A smart PZT-interface is also designed for sensitively monitoring of electromechanical
impedance changes in tendon-anchorage subsystem. Secondly, wireless vibration and impedance sensor
network working on Imote2 platform are outlined with regarding to hardware design and embedded software. Finally, an
experiment on lab-scale cable-anchorage system is performed to evaluate the feasibility of the proposed SHM method.
This paper presents a vibration-based structural health monitoring (SHM) technique using a high sensitive wireless
sensor node for caisson-type breakwater. To achieve the objective, the following approaches are implemented. Firstly,
vibration-based SHM method is selected for caisson-type breakwater. The feasibility of the vibration-based SHM
method is examined for the caisson structure by FE analysis. Foundation loss damage is considered as the damage of
caisson-type breakwater. Secondly, a wireless SHM system with a high sensitive wireless sensor node is designed. The
sensor node is built on an imote2 platform. The vibration-based SHM method is embedded on the sensor node. Finally,
the performance of the wireless SHM technique is estimated from experimental tests on a lab-scaled caisson. The
vibration responses and damage monitoring results are compared with the proposed wireless system and conventional
wired system.
For the safety of cable-stayed bridges, it is very important to ensure the tensile forces of cables. The loss of cable force
could significantly reduce load carrying capacity of the structure and even results in structural collapse. This study
presents a smart PZT-interface associated with wireless sensing device for tendon force-loss monitoring in cable-stayed
bridge. The following approaches are carried out to achieve the objective. Firstly, a smart PZT-interface is designed to
monitor the cable force-loss by using electromechanical
impedance-based method. Secondly, wireless impedance sensor
node is designed for impedance monitoring. The sensor node is mounted on the high-performance Imote2 sensor
platform to fulfill high operating speed, low power requirement and large storage memory. Finally, a system of smart
PZT-interface and wireless sensor node is evaluated for its performance on a lab-scale cable-anchorage model.
In this study, wireless structural health monitoring (SHM) system of cable-stayed bridge is developed using Imote2-
platformed smart sensors. In order to achieve the objective, the following approaches are proposed. Firstly, vibrationand
impedance-based SHM methods suitable for the pylon-cable-deck system in cable-stayed bridge are briefly
described. Secondly, the multi-scale vibration-impedance sensor node on Imote2-platform is presented on the design of
hardware components and embedded software for vibration- and impedance-based SHM. In this approach, a solarpowered
energy harvesting is implemented for autonomous operation of the smart sensor node. Finally, the feasibility
and practicality of the multi-scale sensor system is experimentally evaluated on a real cable-stayed bridge, Hwamyung
Bridge in Korea. Successful level of wireless communication and solar-power supply for smart sensor nodes are verified.
Also, vibration and impedance responses measured from the target bridge which experiences various weather conditions
are examined for the robust long-term monitoring capability of the smart sensor system.
This paper presents a technique for local structural health monitoring (SHM) of multiple structural connections by using
multi-channel wireless impedance sensor nodes based on Imote2 platform. To achieve the objective, following approaches
are implemented. Firstly, an Imote2-based multi-channel wireless impedance sensor node is designed for automated and cost-efficient
impedance-based SHM of structural connections. Secondly, an interface washer associate with impedance
measurements is designed to monitor bearing stress which is considered as main effect on structural connections. Finally,
performances of the multi-channel wireless impedance sensor node and the interface washer are experimentally validated for
a bolted connection model. A damage monitoring method using RMSD index of electro-mechanical impedance signatures is
used to examine the strength of each individual bolted connection.
KEYWORDS: Sensors, Structural health monitoring, Ferroelectric materials, Lab on a chip, Feature extraction, Data acquisition, Liquid crystal lasers, Digital filtering, Microcontrollers, Humidity
This paper presents hybrid structural health monitoring of steel girder connections using wireless acceleration and
impedance sensor nodes based on Imote2-platform. To achieve the research objective, the feasibility of the sensor nodes
is examined about its performance for vibration-based global monitoring and impedance-based local monitoring in the
structural systems as the following approaches. First, a damage monitoring scheme is described in parallel with global
vibration-based methods and local impedance-based methods. Second, multi-scale sensor nodes that enable combined
acceleration-impedance monitoring are described on the design of hardware components and embedded software to
operate. Third, the performances of the multi-scale sensor nodes are experimentally evaluated from damage monitoring
in a lab-scaled steel girder with bolted connection joints.
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