A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Bond behavior of deformed GFRP rebars
The bond behavior of straight GFRP (Glass Fiber Reinforced Plastic) rebars was experimentally investigated with 48 beam and 18 pull-out specimens. The rebar sizes included in this study were No. 3, 6, and 9. The bond behavior of FRP rebars is greatly dependent on the bar type and manufacturing process. For the bars investigated in this study, analysis of the test data led to the following conclusions: 1. When the failure is not governed by the fracture of the rebar, the ultimate bond stress increases with an increase in concrete compressive strength. 2. The applied tensile load approached the ultimate tensile capacity of rebars, fu, as the embedment length increased. 3. For concrete compressive strength of 28 and 56 MPa (4000 and 8000 psi) investigated in this study, the embedment length for No. 3, 6, and 9 bottom rebars is approximately 21, 24, and 27 times bar diameters, respectively. For top rebars the above embedment length should be multiplied by the top bar factor of 1.13. 4. Splitting failure occurred when the clear concrete cover was one rebar diameter; pull out failure and rebar fracture modes were observed when the cover concrete was equal to or larger than twice the rebar diameter. 5. The ultimate bond stress and initial stiffness were found to increase with an increase in clear concrete cover for a given embedment length. 6. The ultimate bond stress and loaded end slip in pull-out specimens were significantly greater than the values observed in beam specimens. Therefore, beam test data are more realistic and accurate for use in determination of development length.
Bond behavior of deformed GFRP rebars
The bond behavior of straight GFRP (Glass Fiber Reinforced Plastic) rebars was experimentally investigated with 48 beam and 18 pull-out specimens. The rebar sizes included in this study were No. 3, 6, and 9. The bond behavior of FRP rebars is greatly dependent on the bar type and manufacturing process. For the bars investigated in this study, analysis of the test data led to the following conclusions: 1. When the failure is not governed by the fracture of the rebar, the ultimate bond stress increases with an increase in concrete compressive strength. 2. The applied tensile load approached the ultimate tensile capacity of rebars, fu, as the embedment length increased. 3. For concrete compressive strength of 28 and 56 MPa (4000 and 8000 psi) investigated in this study, the embedment length for No. 3, 6, and 9 bottom rebars is approximately 21, 24, and 27 times bar diameters, respectively. For top rebars the above embedment length should be multiplied by the top bar factor of 1.13. 4. Splitting failure occurred when the clear concrete cover was one rebar diameter; pull out failure and rebar fracture modes were observed when the cover concrete was equal to or larger than twice the rebar diameter. 5. The ultimate bond stress and initial stiffness were found to increase with an increase in clear concrete cover for a given embedment length. 6. The ultimate bond stress and loaded end slip in pull-out specimens were significantly greater than the values observed in beam specimens. Therefore, beam test data are more realistic and accurate for use in determination of development length.
Bond behavior of deformed GFRP rebars
Bindungsverhalten von deformierten glasfaserverstärkten Kunstoffstäben
Ehsani, M.R. (author) / Saadatmanesh, H. (author) / Tao, S. (author)
1997
28 Seiten, 9 Bilder, 4 Tabellen, 20 Quellen
Article (Journal)
English
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