Influence of fiber orientation and shell thickness on the axial compressive behavior of concrete-filled fiber-reinforced polymer tubes
| Autor: | Arash E. Zaghi, Alexandra Hain, Sarira Motaref |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science Glass fiber 0211 other engineering and technologies Shell (structure) 020101 civil engineering 02 engineering and technology Building and Construction Polymer Fibre-reinforced plastic 0201 civil engineering Core (optical fiber) chemistry 021105 building & construction General Materials Science Fiber Tube (container) Composite material Ductility Civil and Structural Engineering |
| Zdroj: | Construction and Building Materials. 220:353-363 |
| ISSN: | 0950-0618 |
| Popis: | Concrete-filled fiber-reinforced polymer (FRP) tubes (CFFTs) present a viable alternative column system to conventional reinforced concrete for new construction. A CFFT system consists of two parts: the prefabricated FRP tube and the concrete core. The exterior shell provides longitudinal and transverse reinforcement for the concrete core. Many design variables of the FRP shell, including its thickness and winding angle, can be altered to achieve desirable confinement, axial capacity, and ductility in CFFT columns. This research proposes a methodology to determine the minimum fiber angle for filament wound FRP tubes to provide confinement to the concrete core in CFFTs. The proposed approach was used to calculate the threshold winding angle for glass FRPs, which was found to be ±51.5°. To evaluate the proposed fiber angle threshold, 11 circular specimens with a concrete core diameter of 152 mm, a height of 597 mm, and glass fibers at angles of ±45°, ±55°, or ±65° were tested under cyclic axial compression. The effect of fiber angle and thickness of the shell were studied. The experimental results show that the level of confinement increases with winding angle and number of layers of fiber reinforcing, and the specimens with wind angles below the threshold, i.e. ±45°, behave similarly to unconfined concrete. |
| Databáze: | OpenAIRE |
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