Strain evaluation of strengthened concrete structures using FBG sensors

1999 ◽  
Author(s):  
Kin-tak Lau ◽  
Li-min Zhou ◽  
Lin Ye
Keyword(s):  
Concrete Structures ◽  
Fbg Sensors

Structural NDE of concrete structures using protected EFPI and FBG sensors

2006 ◽  
Vol 126 (2) ◽  
pp. 340-347 ◽  
Author(s):  
J.S. Leng ◽  
R.A. Barnes ◽  
A. Hameed ◽  
D. Winter ◽  
J. Tetlow ◽  
...  
Keyword(s):  
Concrete Structures ◽  
Fbg Sensors

scholarly journals Crack Detection of Reinforced Concrete Structures Based on BOFDA and FBG Sensors

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Qinghua Zhang ◽  
Ziming Xiong
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Crack Detection ◽  
Concrete Structures ◽  
Lower Surface ◽  
Reinforced Concrete Beam ◽  
Sensor Data ◽  
Reinforced Concrete Structures ◽  
Surface Cracks ◽  
Fbg Sensors

Reinforced concrete structural elements, as an important component of buildings and structures, require inspection for the purposes of crack detection which is an important part of structural health monitoring. Now existing crack detection methods usually use a single technology and can only detect internal or external cracks. In this paper, the authors propose a new sensing system combining BOFDA (Brillouin optical frequency-domain analysis) and FBG (fiber Bragg grating) technology, which are used to detect internal and surface cracks and their development in reinforced concrete structures, and an attempt is made to estimate the width of surface cracks. In these experiments, a special reinforced concrete beam structure was designed by the author for crack detection under load. Four continuous distributed optical fibers are fixed on the steel skeleton, which is located within the reinforced concrete beam. Three FBG sensors are fixed on the lower surface of the beam, near its centre. By analysing the sensor data, it can be found that the BOFDA-distributed fiber can be used to detect internal cracking before surface cracking, and the difference between scans can be used to judge the time of onset of internal cracking, but the relative error in position is about 5%, while the FBG sensor can detect the cracking time of microcracks on the lower surface in near-real-time and can be used to calculate the crack width. Through the experiment, it is found that if the combination of BOFDA and FBG technology is adopted, we can initially use the strain data obtained by multiple groups of BOFDA monitoring to predict the general location of the internal cracks, then to monitor the exact location of the surface cracks by FBG in the medium term, and to estimate the width of the final expansion of the cracks finally.

TECHNIQUE FOR INSTRUMENTATION AND MEASUREMENT OF INTERFACIAL STRAINS IN FRP STRENGTHENED CONCRETE STRUCTURES USING FBG SENSORS

2010 ◽  
Vol 35 (4) ◽  
pp. 35-38 ◽  
Author(s):  
B. Arun Sundaram ◽  
K. Kesavan ◽  
S. Parivallal ◽  
K. Ravisankar
Keyword(s):  
Concrete Structures ◽  
Fbg Sensors

scholarly journals Monitoring of FRP Strengthened Concrete Structures Using FBG Sensors

2011 ◽  
Vol 14 ◽  
pp. 1549-1556 ◽  
Author(s):  
B. Arun Sundaram ◽  
K. Kesavan ◽  
S. Parivallal ◽  
A.K. Farvaze Ahmed ◽  
K. Ravisankar
Keyword(s):  
Concrete Structures ◽  
Fbg Sensors

Design of precast reinforced concrete structures of frame buildings: a new set of rules

2019 ◽  
pp. 4-9 ◽  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Building Frames ◽  
Fine Grained ◽  
Rigid Frame ◽  
Floor Slabs ◽  
Frame Buildings ◽  
Spatial System ◽  
Precast Elements

Currently, prefabricated reinforced concrete structures are widely used for the construction of buildings of various functional purposes. In this regard, has been developed SP 356.1325800.2017 "Frame Reinforced Concrete Prefabricated Structures of Multi-Storey Buildings. Design Rules", which establishes requirements for the calculation and design of precast reinforced concrete structures of frame buildings of heavy, fine-grained and lightweight structural concrete for buildings with a height of not more than 75 m. The structure of the set of rules consists of eight sections and one annex. The document reviewed covers the design of multi-story framed beam structural systems, the elements of which are connected in a spatial system with rigid (partially compliant) or hinged joints and concreting of the joints between the surfaces of the abutting precast elements. The classification of structural schemes of building frames, which according to the method of accommodation of horizontal loads are divided into bracing, rigid frame bracing and framework, is presented. The list of structural elements, such as foundations, columns, crossbars, ribbed and hollow floor slabs and coatings, stiffness elements and external enclosing structures is given; detailed instructions for their design are provided. The scope of the developed set of rules includes all natural and climatic zones of the Russian Federation, except seismic areas with 7 or more points, as well as permafrost zones.

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