Fiber optic Bragg grating strain sensor in large-scale concrete structures

1993 ◽  
Author(s):  
John D. Prohaska ◽  
Elias Snitzer ◽  
Benxian Chen ◽  
Mohamed H. Maher ◽  
E. G. Nawy ◽  
...  
Keyword(s):  
Large Scale ◽  
Fiber Optic ◽  
Concrete Structures ◽  
Strain Sensor ◽  
Bragg Grating

Testing and Monitoring for a Large Scale Truss Bridge Using Long-Gauge Fiber Optic Sensors

2013 ◽  
Vol 569-570 ◽  
pp. 223-229 ◽  
Author(s):  
Chun Feng Wan ◽  
Wan Hong ◽  
Zhi Shen Wu ◽  
Tadanobu Sato
Keyword(s):  
Damage Detection ◽  
Structural Damage ◽  
Large Scale ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Structural Testing ◽  
Bragg Grating ◽  
Truss Bridges ◽  
Long Span ◽  
Truss Bridge

Fiber optic sensors become very popular for structural testing and monitoring in civil engineering nowadays, due to its advantage of high resolution and environment durability. In this paper, long-gauge fiber optic bragg grating sensors will be introduced. Structural damage detection stratagem using the micro-strain mode will be studied. Then its application to a structural testing and monitoring for a real long span truss bridge will be discussed in detail. In the testing, 23 long-gauge fiber optic bragg grating sensors were deployed on the mid span of the bridge. Testing were made under conditions either there is train on the bridge or no train on it. Corresponding dynamic characteristics were analyzed and discussed. Results of the testing show that long-gauge fiber optic sensors can work well for structural testing and also damage detection for truss bridges.

Multiplexed fiber optic Bragg grating strain sensor system for use in marine vehicle testing

1996 ◽  
Author(s):  
Dag R. Hjelme ◽  
Bjorn Bakke ◽  
Jan S. Rambech ◽  
Steinar Neegaard
Keyword(s):  
Fiber Optic ◽  
Strain Sensor ◽  
Sensor System ◽  
Bragg Grating ◽  
Vehicle Testing ◽  
Marine Vehicle

scholarly journals Development and Application of Smart Geogrid Embedded with Fiber Bragg Grating Sensors

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Zheng-fang Wang ◽  
Jing Wang ◽  
Qing-mei Sui ◽  
Xun-mei Liang ◽  
Lei Jia ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Distribution ◽  
Fiber Optic ◽  
Strain Sensor ◽  
Bragg Grating ◽  
Tunnel Excavation ◽  
Strain Transfer ◽  
Geotechnical Structures ◽  
Higher Temperature ◽  
Geotechnical Model

Smart geogrids embedded with fiber Bragg grating (FBG) for reinforcement as well as measurement of geotechnical structures have been developed. After the fabricating process of the geogrids is detailed, finite element (FE) simulations are conducted to analyze the strain distribution of geogrids and the strain transfer characteristics from geogrids to fiber optic. Results indicate that FBG should be deployed in the middle of the geogrids rib to make sure that uniform strain distribution along the FBG. Also, PVC protective sleeves, which are used to protect fiber optic when integrated with geogrids, have smaller strain transfer loss than nylon sleeves. Tensile experiments are conducted to test strain measurement performance of proposed geogrids, and the results demonstrate that proposed smart geogrids have good linearity and consistency. Temperature experiments show that FBG embedded in geogrids has higher temperature sensitivity, and the temperature induced error can be compensated by an extra FBG strain-independent sensor. Furthermore, designed smart geogrids are used in a geotechnical model test to monitor strain during tunnel excavation. The strain tendency measured by smart geogrids and traditional strain sensor agree very well. The results indicate that smart geogrids embedded with FBGs can be an effective method to measure strains for geological engineering related applications.

Sign in / Sign up

Export Citation Format

Share Document