Long-term monitoring of a concrete bridge with 100+ fiber optic long-gauge sensors

1999 ◽  
Author(s):  
Daniele Inaudi ◽  
Samuel Vurpillot ◽  
Branko Glisic ◽  
Pascal Kronenberg ◽  
Sandra LLoret
Keyword(s):  
Fiber Optic ◽  
Concrete Bridge ◽  
Long Term Monitoring ◽  
Term Monitoring

scholarly journals ANALYSIS OF THE ACCURACY OF FIBRE-OPTIC STRAIN GAUGES

2013 ◽  
Vol 53 (6) ◽  
pp. 872-877
Author(s):  
Dita Jiroutová ◽  
Miroslav Vokáč
Keyword(s):  
Fiber Optic ◽  
Strain Gauges ◽  
Relative Deformation ◽  
Fibre Optic ◽  
Reinforced Concrete Structure ◽  
Structure Monitoring ◽  
Fiber Optic Technology ◽  
Long Term Monitoring ◽  
Term Monitoring

In recent years, the field of structure monitoring has been making increasing use of systems based on fiber-optic technologies. Fiber-optic technology offers many advantages, including higher quality measurements, greater reliability, easier installation and maintenance, insensitivity to the environment (mainly to the electromagnetic field), corrosion resistance, safety in explosive and flammable environments, the possibility of long-term monitoring and lower cost per lifetime. We have used SOFO fibre-optic strain gauges to perform measurements to check the overall relative deformation of a real reinforced concrete structure. Long-term monitoring of the structure revealed that the measurement readings obtained from these fibre-optic strain gauges differed from each other. Greater attention was therefore paid to the calibration of the fibre-optic strain gauges, and to determining their measurement accuracy. The experimental results show that it is necessary to calibrate SOFO strain gauges before they are used, and to determine their calibration constant.

scholarly journals Horizontal wellbore production profile evaluation by distributed fiber-optic temperature surveillance

2021 ◽  
Vol 6 (4) ◽  
pp. 81-91
Author(s):  
Andrey I. Ipatov ◽  
Mikhail I. Kremenetsky ◽  
Ilja S. Kaeshkov ◽  
Mikhail V. Kolesnikov ◽  
Alexander  A. Rydel ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Phase Segregation ◽  
Gas Production ◽  
Fiber Optic Sensor ◽  
Well Testing ◽  
Reservoir Properties ◽  
Horizontal Wellbore ◽  
Long Term Monitoring ◽  
Term Monitoring

The main goal of the paper is demonstration of permanent downhole long-term monitoring capabilities for oil and gas production profile along horizontal wellbore in case of natural flow. The informational basis of the results obtained is the data of long-term temperature and acoustic monitoring in the borehole using a distributed fiber-optic sensor (DTS + DAS). Materials and methods. At the same time, flowing bottom-hole pressure and surface rates were monitored at the well for rate transient analysis, as well as acoustic cross-well interference testing [1], based on the results of which “well-reservoir” system properties were evaluated, the cross-well reservoir properties of the were estimated, and the possibility of cross-well testing using downhole DTS-DAS equipment was justified. The research results made it possible to assess reliability of DTS-DAS long-term monitoring analysis results in case of multiphase inflow and multiphase wellbore content. In particular, DTS-DAS results was strongly affected by the phase segregation in the near-wellbore zone of the formation. Conclusions. In the process of study, the tasks of inflow profile for each fluid phase evaluation, as well as its changes during the well production, were solved. The reservoir intervals with dominantly gas production have been reliably revealed, and the distribution of production along the wellbore has been quantified for time periods at the start of production and after production stabilization.

Concrete Bridge Instrumentation for Seismic and Long-Term Monitoring

2004 ◽  
Vol 88 (2) ◽  
pp. 67-72
Author(s):  
Ian Robertson ◽  
Gaur Johnson ◽  
Kainoa Aki
Keyword(s):  
Concrete Bridge ◽  
Long Term Monitoring ◽  
Term Monitoring

Long-Term Effects Monitoring on Prestressed Concrete Bridge

2016 ◽  
Vol 691 ◽  
pp. 250-258
Author(s):  
Martin Moravcik ◽  
Lukas Krkoska
Keyword(s):  
Prestressed Concrete ◽  
Crack Opening ◽  
Structural Behavior ◽  
Concrete Bridge ◽  
Long Term Effects ◽  
Long Term Monitoring ◽  
Stress And Deformation ◽  
Early Reconstruction ◽  
Term Monitoring

Balanced cantilever method is one most used method for the large span concrete bridge construction. Generally non-homogenous concrete structures with changing the structural system within its erection are sensitive to the deformation and stress prediction in time. Long-term monitoring system has become very important tool which enables to obtain basic information about actual structural behavior in time about stress and deformation level. It can also cover the other structural effects for example the temperature influence which can significantly affect to the later structural behavior. Generally bridge designers in practice do not have enough information about these influences within the structure erection over the time. Underestimating such above mentioned effects often causes that predicted values of stresses or deformation does not corresponded with the reality as was published for example in [1]. In boundary cases unexpected excessive deformations or crack opening due to the stresses distribution may lead to the serviceability problems, deterioration of aesthetics, and even early reconstruction of the bridge eventually. In this paper we would like to present some experiences with the long-term monitoring of bridge structure and performed structural analysis considering the real load history and structural scheme changing. Recorded strains development was compared with the numerical model results based on the expected behavior of prestressed concrete structure according to the European standard models, [3, 4].

scholarly journals Long-term monitoring of reinforced earth structures using distributed fiber optic sensing

2016 ◽  
Vol 6 (3) ◽  
pp. 321-327 ◽  
Author(s):  
Florian Moser ◽  
Werner Lienhart ◽  
Helmut Woschitz ◽  
Hartmut Schuller
Keyword(s):  
Fiber Optic ◽  
Reinforced Earth ◽  
Earth Structures ◽  
Long Term Monitoring ◽  
Fiber Optic Sensing ◽  
Term Monitoring
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