Abstract
Although reinforced concrete (RC) columns subjected to combined axial compression and flexural loads (i.e., eccentric load) are the most common structural members used in practice, research on FRP-confined circular RC columns subjected to eccentric axial compression has been very limited. More specifically, the available eccentric-loading models were mainly based on existing concentric stress–strain models of FRP-confined unreinforced concrete columns of small scale. The strength and ductility of FRP-strengthened slender circular RC columns predicted using these models showed significant errors. In light of such demand to date, this paper presents a stress–strain model for FRP-confined circular reinforced concrete (RC) columns under eccentric axial compression. The model is mainly based on observations of tests and results reported in the technical literature, in which 207 results of FRP-confined circular unreinforced and reinforced concrete columns were carefully studied and analyzed. A model for the axial-flexural interaction of FRP-confined concrete is also provided. Based on a full parametric analysis, a simple formula of the slenderness limit for FRP-strengthened RC columns is further provided. The proposed model considers the effects of key parameters such as longitudinal and hoop steel reinforcement, level of FRP hoop confinement, slenderness ratio, presence of longitudinal FRP wraps, and varying eccentricity ratio. The accuracy of the proposed model is finally validated through comparisons made between the predictions and the compiled test results.
Highlights
The building industry plays a significant role in the development of human history.There are various building materials, such as structural materials, decorative materials, and some special materials, that have significantly contributed to the development of the building industry
Building polymers commonly used in the construction industry include polyethylene (PE), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polyester resin (PR), polystyrene (PS), polypropylene (PP), phenolic resin (PF), and organic silicon resin (OSR)
Hoop wraps; tf is the nominal thickness of an Fiber-reinforced polymers (FRPs) hoop sheet; D is the diameter of a circular section; εfu is the ultimate tensile strain of FRP resulted from flat coupon tests; fc ’ is the unconfined concrete cylinder strength (MPa)
Summary
The building industry plays a significant role in the development of human history. There are various building materials, such as structural materials, decorative materials, and some special materials, that have significantly contributed to the development of the building industry. Provided a numerical compression model to evaluate the efficiency of FRP confinement in square and rectangular RC columns under eccentric loads In their model, the negative effect of increasing the load eccentricity on the ductility gain was considered, and there was a close agreement between strength results of concentric and eccentric tests. The negative effect of increasing the load eccentricity on the ductility gain was considered, and there was a close agreement between strength results of concentric and eccentric tests These two significant parameters (eccentricity and slenderness ratios) were only considered in the ductility model. There are many experimental and/or analytical studies on FRP-confined concrete columns under axial compression loading (e.g., [49,50,51,52,53,54]), most of the models have not yet considered the effects of slenderness and eccentric loading. Comparisons between the model results and the tests indicated more accuracy compared with existing models
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
