期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 224, 期 -, 页码 1-18出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.07.061
关键词
Concrete; FRP; Calibration procedure; Non-uniform confinement; Stress-strain relationship; Load-path dependence
资金
- National Natural Science Foundation of China [51378449]
- Research Grants Council of the Hong Kong SAR
- PolyU [152171/15E]
Extended linear Drucker-Prager (DP) model has been a proper choice to capture the stress-strain of cylindrical concrete columns confined by fiber reinforced polymers (FRPs). However, most existing DP models calibrated by uniform active/passive tests are unsuitable for concrete under non-uniform passive confinement. This paper aims to calibrate the key parameters i.e., friction angle, plastic dilation angle and hardening needed for the DP model based on tri-axial test results on concrete cube subjected to non-uniform confinement. The effect of friction angle parameter is isolated from the hardening parameter within the yield function while the friction angle is defined as a function of concrete grade and hardening as a function of lateral confinement stiffness ratio. Here, the plastic lateral strains of non-uniform confined concrete, which could be obtained in cyclic tests but were usually left aside, are used to define a function for plastic dilation angle which works compatibly with the yield parameters. The resultant extended DP model could capture the stress-strain behaviour of concrete under both uniform or non-uniform passive pressure as well as the variable flow rules and different load paths occurring across the section of FRP-confined non-circular concrete. (C) 2019 Elsevier Ltd. All rights reserved.
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