Hawk Measurement Systems
Smart Sensor Technology for Bridge Health
Structural Health Monitoring of Bridges
Bridge health is an important issue• Bridge collapses often result in a large number of casualties, as well
as negative social and economic consequences.
• I-35W Mississippi River Bridge near Minneapolis collapsed on 01/08/2007. 13 people died and 145 were injured.
Life span of highway bridges is ~70 years• An MIT estimate says, over the next few years, costs for repair and
refits amount $ 600 billion a year
• Structural health monitoring can mitigate problems
Conventional Monitoring Systems
Expensive
• $4,000-15,000 per sensor using wired devices
• $600 per sensor using wireless devices
Point sensor
• Each sensor can only monitor one spot and one parameter
Regular maintenance is costly and necessary
Every sensor needs to be powered
Bulky
Recently Developed Wireless Sensors
• 71 wireless sensor nodes
with a total of 427 sensing
channels were installed
on the girder, pylons, and
cables in 2009 to monitor
cable tension force,
temperature and dynamic
instability to determine
structural performance
and find possible damage
locations.
• Wireless sensors also
have the disadvantages
of conventional sensors.
The second Jindo Bridge in South Korea
Subheading:
• Dot Point
• Dot Point
• Dot Point.
Fibre Optic Sensing
• Distributed sensor can continuously monitor vibration, strain and temperature on structural elements of the bridge for the entire length of optical fibre.
• Fibre optic cable is easy to install.
• Fibre optic cable is passive – No electrical power required.
• Little or no maintenance required.
• Fibre optic sensing has low cost.
Fibre Optic Sensing Suits All Types of Bridges
• Stress, strain along tensile members and cables
• Compressive strain on support columns
• Vibration and resonance effects
• Emergence of cracks
• Movement of joints and hinges
• Temperature
• Deflection of beam, arch and truss etc.
Types of Distributed Monitoring
On-site fibre optic sensor gluing procedure (left) and
installed fibre optic sensor (right)
Thank You!
Top Related