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Title: Cyclic stress-strain model incorporating buckling effect for steel reinforcing bars embedded in FRP-confined concrete
Authors: Bai, YL
Dai, JG 
Ozbakkaloglu, T
Keywords: Stress-strain model
Bar buckling
FRP confinement
Cyclic model
Issue Date: 2017
Publisher: Elsevier
Source: Composite structures, 2017, v. 182, p. 54-66 How to cite?
Journal: Composite structures 
Abstract: Buckling of steel reinforcement usually causes a sudden loss of the load-carrying capacity and the ultimate state of conventional reinforced concrete (RC) cylinders. However, reinforcing bars behave differently in fiber-reinforced polymer (FRP)-confined RC cylinders due to the lateral confinement effect of FRP. This paper presents a theoretical study into the buckling behavior of longitudinal steel reinforcing bars embedded in FRP-confined concrete subjected to cyclic axial compression. An empirical monotonic compressive stress-strain model considering the buckling effects proposed previously for laterally supported reinforcing bars is extended to a cyclic model by combining the monotonic envelope and the Menegotto-Pinto model accounting for the cyclic loops. The cyclic stress-strain models for both laterally supported reinforcing bars and FRP-confined plain concrete are then implemented into the OpenSees software platform and validated through comparisons with compressive test results on cyclically loaded FRP-confined plain and RC cylinders. The proposed cyclic stress-strain model for laterally supported reinforcing bars is expected to serve as a fundamental model for predicting the seismic behavior of FRP-strengthened RC cylinders with widely-spaced transverse ties under cyclic axial compression, in which case the local buckling of reinforcing bars usually occurs between two adjacent transverse ties.
ISSN: 0263-8223
EISSN: 1879-1085
DOI: 10.1016/j.compstruct.2017.09.007
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