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Representative work by over 25 Engineers , technical staff, and graduate students at the Department of Civil & Materials Engineering University of Illinois at Chicago Assure safety •Warn of impending failures •Rapid post-disaster assessment •Save lives Maintenance and Management •Detect damage at early stages of formation •Automate, simplify and provide real time access to data •Reduce life-cycle costs In-service Structural and Materials behavior •Quantitative assessment of structural response •Data for development of innovative materials and structural designs •Determine Construction quality Civil structures are large and complex Many sensors, and lead lines Too much data Why Optical Fiber Sensors • Flexible and geometrically versatile for embedment or adhesion to structural elements. • Serve the dual purpose as the sensor and pathway for the signal. • Distributed measurements or serial multiplexing • Extremely small and lightweight. • Immune to electrical and electromagnetic interference. • Resist corrosion and fatigue. • Safe (incapable of initiating fire or explosions). • Capable of making high resolution measurements Localized and Distributed FOS Sensor Types Fiber Bragg Gratings (FBG) –wavelength change • Discrete/strain/Temperature BOTDA/BOTDR- Brillouin Frequency shift • Distribute Strain/Temperature Accelerometer Tiltmeter Displacment/Crack Strain Gauge Gauge FBG Interrogstor D istributed Monitoring Strategies  Use a Single Sensor to monitor the entire infrastructure  Develop simplified analysis techniques Optical Fiber Sensors 30 years ago Today Applications in Tomorrow Aeronautics FBG sensors widely Composite employed in many Distributed Sensors Materials infrastructure will practically applications replace FBG sensors • Shear Force Based BWIM system • Specific application to monitor loads in real time in Bridges • Monitoring of vault cracks in Brooklyn Bridge • Specific application to determine the cause for cracking and to assure safety

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installed below bridge deck. ▫ Sensors are installed near abutments. Distance from the Beginning of Span (point O) to the location of the axle. S o.

Infrastructure Monitoring and Assessment PDF

84 Pages·2017·7.95 MB·English

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by Unknow| 2017| 84 pages| 7.95| English

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installed below bridge deck. ▫ Sensors are installed near abutments. Distance from the Beginning of Span (point O) to the location of the axle. S o.

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Author:	Unknown
Publication Year:	2017
Pages:	84
Language:	English
File Size:	7.95
Format:	PDF
Price:	FREE

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