Bond Stress-Slip Characteristics of FRP Rebars
Interim rept. FY1992-FY1993
NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
Pagination or Media Count:
The bond characteristics of four different types of glass fiber- reinforced plastic GFRP rebars with different surface deformations were analyzed experimentally. Local bond stress-slip data, as well as bond stress- radial deformation data, needed for constitutive modeling of the interface mechanics, were obtained for varying levels of confining pressure. In addition to bond stress and slip, radial stress and radial deformation were considered fundamental variables needed to provide for configuration-independent relationships. Each test specimen consisted of a 6 GFRP rebar embedded in a 3- inch-diameter, 4-inch-long cracked concrete cylinder subjected to a controlled, constant amount of confining axisymmetric radial pressure. Only 2.625 inches the equivalent of five steel bar lugs of contact were allowed between the bar and the concrete. For each rebar type, bond stress-slip and bond stress-radial deformation relationships were obtained for five levels of confining axisymmetric radial pressure. It was found that small surface indentations are sufficient to yield bond strengths comparable to that of steel bars. Effects of the deformations on tensile properties are discussed. It is also shown that radial pressure is an important parameter which can increase the bond strength threefold. Glass fiber-reinforced plastic rebars, Stress-slip data, Stress- radial deformation data, Modeling, Confining pressure, Bond strengths.
- Laminates and Composite Materials