Nonlinear behavior of concrete beams with hybrid FRP and stainless steel reinforcements |
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Authors: | Zhi Fang Chang Gong Jian Yang and T I Campbell |
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Affiliation: | (1) School of Civil Engineering, Hunan University, Changsha, 410082, China;(2) School of Civil and Architectural Engineering, Central South University, Changsha, 410075, China;(3) Department of Civil Engineering, Queen’s University, Ontario, K7L3N6, Canada |
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Abstract: | The full-range behavior of partially bonded, together with partially prestressed concrete beams containing fiber reinforced
polymer (FRP) tendons and stainless steel reinforcing bars was simulated using a simplified theoretical model. The model assumes
that a section in the beam has a trilinear moment—curvature relationship characterized by three particular points, initial
cracking of concrete, yielding of non-prestressed steel, and crushing of concrete or rupturing of prestressing tendons. Predictions
from the model were compared with the limited available test data, and a reasonable agreement was obtained. A detailed parametric
study of the behavior of the prestressed concrete beams with hybrid FRP and stainless steel reinforcements was conducted.
It can be concluded that the deformability of the beam can be enhanced by increasing the ultimate compressive strain of concrete,
unbonded length of tendon, percentage of compressive reinforcement and partial prestress ratio, and decreasing the effective
prestress in tendons, and increasing in ultimate compressive strain of concrete is the most efficient one. The deformability
of the beam is almost directly proportional to the concrete ultimate strain provided the failure mode is concrete crushing,
even though the concrete ultimate strain has less influence on the load-carrying capacity.
Foundation item: Project (50478502) supported by the National Natural Science Foundation of China |
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Keywords: | beam fiber reinforced polymer (FRP) stainless steel prestress deformability reinforcement |
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