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Glass Fiber Reinforcement PolymerA Comparison with Traditional Reinforcement
Matthew Williams
Motivation
- Structural concentration with an interest in bridge design
- Studied alternative reinforcement in Advanced Concrete Technology
- Steel corrosion is a major infrastructure concern
- Epoxy coating is ineffective and stainless steel is expensive
Traditional Steel Reinforcement
Pros- Cheap- Provides ductile failure- Good strength to
weight ratio
Cons- Susceptible to corrosion- Coatings offer little protection- Cause of majority of bridge
repairs- Environmental impacts
What Is GFRP- Glass fiber cured in
epoxy resin- Provides superior
strength in the longitudinal direction
- Recommended safety factor of 0.85-0.7 for flexural design
http://www.build-on-prince.com/glass-fiber.html#sthash.9iOUBSVO.dpbs
Glass Fiber Reinforcement
Pros- Corrosion resistance- Lightweight- 3 times tensile strength
of steel
Cons- Cost- Glass fibers do react with
concrete - Brittle failure- Availability
Comparing Reinforcements- Adam et al. 2015 experimentally tested 10 GFRP
reinforced beams- Compared with FEM analysis- Want to try and replicate displacements that were
achieved.- Nanni 2003 states that serviceability may be more
important than strength.- Additionally, went to run FEM analysis comparing
displacement and stress distributions in FRP vs. Steel.
Experimental vs. FEM Method
Steel vs. GFRP Method
Results
Results
FEM Stress Distribution
GFRP
Steel
Conclusions
- Difficult to replicate experimental results with software
- Proper stress distributions were replicated- Higher neutral axis was achieved- GFRP displacements were greater as
expected
Questions?
ReferencesAdam, Maher A., et al. "Analytical and experimental flexural behavior of concrete beams reinforced with glass fiber reinforced polymers bars."Construction and Building Materials 84 (2015): 354-366.
Aguiñiga, F., H. Estrada, and J. I. Cruz. "Effects of Cyclic Loading on Structural Performance of Glass Fiber Reinforced Polymer Reinforced Concrete Elements." Structures Congress 2006@ Structural Engineering and Public Safety. ASCE, 2006.
Karbhari, V. M., et al. "Durability gap analysis for fiber-reinforced polymer composites in civil infrastructure." Journal of Composites for Construction 7.3 (2003): 238-247.
Nanni, Antonio. "North American design guidelines for concrete reinforcement and strengthening using FRP: principles, applications and unresolved issues."Construction and Building Materials 17.6 (2003): 439-446.
Sim, Jongsung, and Cheolwoo Park. "Characteristics of basalt fiber as a strengthening material for concrete structures." Composites Part B: Engineering 36.6 (2005): 504-512.
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