micronoptics-chiapas bridge 2008
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8/12/2019 MicronOptics-Chiapas Bridge 2008
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Case Study Bridges
Chiapas BridgeChiapas, Mxico, 2008
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Chiapas Bridge- General Characteristics
Length: 1,208m, W idth: 10m, D eck width: 8m, Lanes: 2
Construction type: steel box girder supported on steel pillars.A total of 102 boxes welded together.
Location: K m 961 of the C oapas-O cozocoautla highway in thestate of Chiapas, M exico.
In service since Dec. 2003.
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Chiapas Bridge Structural Monitoring System Overview
A imTo monitor the integrity and behavior of the bridge structure, and
effects due to high traffic and heavy truck loads that could cause
possible damage & fatigue.
Location Chiapas, M exico
System Integrator Chandler M onitoring Systems, Inc.http://www.chandlermonitoring.net
Customer Instituto de Ingeniera, N ational Univ. of M exico (U NA M )Date N ovember 2-16, 2008
Instrumentation(1) M icron O ptics sm130-500 O ptical Sensing Interrogator
(1) M icron O ptics sp130-500 O ptical Sensing Processor M odule
(1) M icron O ptics sm041-416 O ptical Channel Switch Extension
Sensors (64) M icron O ptics os3100 Spot-Weld Strain Gage(18) M icron Optics os4100 Temperature Compensation Sensors
Project S cope
Long-term monitoring of strain and temperature at 16
different sections along bridge span.
System powered on-site via solar panels.
O n-site and remote data retrieval. Sensors monitor the strains, deflection and possible
sloping of the steel girder bridge box. D ata also helps
determine strain variations, vibrations and expansion
effects as a function of time of day, seasons and traffic.
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Chiapas Bridge: Longitudinal Section
Sensors were installed along the length of the steel box girder at 16 different sections.
Key sections are located at pi llar support points and pillar-to-pillar mid-span points.
A total of 82 sensors (64 strain and 18 temperature) were installed.
Additional accelerometers and ti lt meters are planned to be installed later.
Installation sections
Section 16 Section 1
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Chiapas Bridge: Cross-Section and Sensor Locations
strain sensor
temperature sensor
ventilation opening
Strain Sensors, os3100
There are 4 strain &
2 temperature sensors
per section. Spot-welded
Temperature Sensors,os4100
Bridge steel superstructure
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Chiapas Bridge: Sensor Network Configuration
Ch 16,Section 16
M onitoring system housed in
ambient-controlled enclosure.
Ch 1,Section 1 Ch 2, Section 2
M ain optical sensing cable (16 fibers)
Branching fibers have FBG sensors connected
In series to them (6 total/section some sections only 4)
sm130-500,
Sensor Interrogator
sm041-416,
Sensor M ultiplexer
Ch 1 (Bridge Section 1)
Ch 16 ( Bridge Section 16)
( ) Ch 15 (Bridge Section 15)
sp130, Controller& D ata Storage
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Chiapas Bridge Installation (Bridge Access) 7
Installation crew Chandler M onitoring Inc. arrives on site.
A ll hardware and sensors were previously shipped to M exico C ity and then trucked to the site.
Access to the inside of the bridge is via an external access ladder.
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Chiapas Bridge Installation 8
FBG sensor arrays on-site deployment
O nce on-site, sensor sections are unpacked
Each section is retested before installation on the steel bridge truss
FBG sensor arrays preparation
Pre-assembled to length for each bridge segment
Each bridge segment array tested before packaging
Custom packaged before shipping to the site
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Chiapas Bridge Installation (Sensor Array Topology) 9
Splice tray for segment 2.
Schematic of sensor cable layout for each bridge segment tapped from main feed.
os3100 with protective cover patch (A quaseal)Bridge floor
Bridge roof Crush resistant fiber cable.
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2
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os3100 on truss ceiling..
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Chiapas Bridge: Aspect of Installed Sensors (Section 4)
Fiber optic strain sensors
M ain optical sensing cable (16 fibers)
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Chiapas Bridge Installation of Roof Sensors (Section 4) 11
os3100 strain sensors being installed on the ceiling of the bridge truss.
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Chiapas Bridge Installation (Splicing to Trunk FO Cable) 12
Tapping into the main 1.1km cable feed at each of
the 16 bridge segment locations.
M ain cable feed tapping point and industrial
grade splice tray.
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Chiapas Bridge Installation (Protective Cabinet) 13
Fiber cables 16) leading to sensors
The optical system is
housed inside NEM A type
box with controlledtemperature and humidity.
sp130-500 (controller)
sm130-500 (interrogator)
sm041-416 (multiplexer)
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Chiapas Bridge Results and Acknowledgements
R esults Customer is currently monitoring the bridge. M ore information will become
available in the future. The installation process was sim plified and future upgrades will be easy,
due to the simple, bus-type signal cable architecture of the monitoringsystem and its clear wavelength allocation.
A cknowledgements
Drs. Roberto Gmez M artnez and David M uria Vila of the Instituto deIngeniara, U niversidad Nacional Autnoma de M xico (U NAM ) - Endcustomer and operator of the monitoring system.
web: www.unam.mx/
Dr. A lexis M ndez of M CH Engineering, LLC -System designer. Tel: 510-521-1069, email: alexis.mendez@ mchengineering.com
Keith Chandler of Chandler M onitoring Systems, Inc. -System integratorand on-site installer.
Tel: 678-985-9216, email: info@ chandlermonitoring.net, web: www.chandlermonitoring.net
M icron O ptics, Inc, U SA Tel: 404-325-0005, email: info@ micronoptics.com, web: www.micronoptics.com
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http://www.unam.mx/mailto:alexis.mendez@mchengineering.commailto:info@chandlermonitoring.nethttp://www.chandlermonitoring.net/mailto:info@micronoptics.comhttp://www.micronoptics.com/http://www.micronoptics.com/mailto:info@micronoptics.comhttp://www.chandlermonitoring.net/mailto:info@chandlermonitoring.netmailto:alexis.mendez@mchengineering.comhttp://www.unam.mx/
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