Journal
JOURNAL OF COMPOSITES FOR CONSTRUCTION
Volume 19, Issue 4, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)CC.1943-5614.0000511
Keywords
Concrete; Columns; Fiber reinforced polymer (FRP); Steel; Stress-strain relationship; Confinement; General model
Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [CityU 124113]
- National Natural Science Foundation of China [51208262]
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A new and general stress-strain model for concrete confined by steel or fiber reinforced polymer (FRP) is developed in this work. One additional variable and one constant are added to the well-known Popovics model to control the type and the shape of the stress-strain curve. The proposed model has one simple, continuous, and explicit expression and can exhibit either hardening or softening types of responses. This general model provides a unified platform for modeling stress-strain of concrete confined by different materials, such as steel or FRP, and help to overcome inconsistency or complexity. The parameters of the stress-strain model are determined by analytical study and data regression using a large and up-to-date test database. The proposed stress-strain model is validated with experimental results and compared with existing models; it shows good performance and superior flexibility and versatility of the model. (C) 2014 American Society of Civil Engineers.
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