Conference proceeding
Design methodology of a ductile hybrid FRP for concrete structures by the braidtrusion process
46th International SAMPE Symposium and Exhibition.; Long Beach, CA; USA; 6-10 May 2001, pp.2421-2432
06 May 2001
Abstract
Reinforced concrete (R/C) structures, especially pavements and bridge decks that constitute vital elements of the infrastructure of all industrialized societies, are deteriorating prematurely. Structural repair and upgrading of these structural elements have become a more economical option for constructed facilities especially in the United States and Canada. This problem has been investigated at Drexel University in the form of a ductile hybrid fiber reinforced polymer (D-H-FRP) bar that simulates the stress-strain characteristics of conventional steel reinforcement. The D-H-FRP bar exhibits a bilinear stress-strain behavior, which shows significant material toughness for all bar sizes. The D-H-FRP bars are produced using a combination of both traditional pultrusion and braiding processes simultaneously, creating a 'Braidtrusion' process. The bars have been produced in 3-mm and 5-mm diameter model sizes and a 10-mm diameter prototype size. Using a hierarchical design methodology, a pseudo-ductile bar has been developed utilizing both material and architectural hybrids. The bars are a material hybrid of aramid (Kevlar 49) and carbon (Thornel P-55S). Design optimization parameters include high initial stiffness, the level of yield stress, and large elongation to failure. The uniaxial tensile strength was first investigated and shows significant ductility. High initial stiffness and large elongation after yield was illustrated. The D-H-FRP bars were then placed in model reinforced concrete (R/C) beams and beam-columns. The beams were loaded in three-point bending under unidirectional static load while the beam-columns were subject to increasing load reversals to failure. Both tests demonstrate significant ductility and material toughness of the D-H-FRP bars, especially under reverse cyclic loading. In addition to significant ductility, the bond strength of the D-H-FRP bar must also be comparable to steel, and therefore, must be investigated.
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Details
- Title
- Design methodology of a ductile hybrid FRP for concrete structures by the braidtrusion process
- Creators
- F HamptonH LamF KoH Harris
- Publication Details
- 46th International SAMPE Symposium and Exhibition.; Long Beach, CA; USA; 6-10 May 2001, pp.2421-2432
- Conference
- 46th International SAMPE Symposium and Exhibition, 46th (Long Beach, California, United States, 06 May 2001 - 10 May 2001)
- Number of pages
- 1
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- [Retired Faculty]
- Identifiers
- 991019170326404721