Journal
COMPOSITE STRUCTURES
Volume 201, Issue -, Pages 902-915Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2018.06.088
Keywords
Concrete; FRP; Cyclic loading; Stress-strain model; Confinement rigidity; Strain softening
Categories
Funding
- National Natural Science Foundation of China [51378449]
- Research Fund (Free Exploration) of Shenzhen [JCYJ20170817100253542]
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The majority of existing cyclic stress-strain models for fiber reinforced polymer (FRP) confined concrete are applicable only to cases where post-peak strain hardening occurs. Cyclic model catering for strain softening is rare due to the lack of sufficient experimental data. Recent experimental tests on FRP-confined concrete cylinders involving strain-softening have identified new factors that have a significant effect on the cyclic behavior. Through an analytical study, a newly defined parameter, the effective confinement rigidity, is found to be a key factor governing the cyclic softening and hardening. By including the additional key factors and using the latest database with more strain-softening cyclic stress-strain curves, a stress-strain model of FRP-confined concrete subjected to cyclic loading considering both post-peak hardening and softening is proposed. Compared with the existing models, the proposed model can predict the cyclic behavior of FRP-confined concrete with better accuracy.
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