期刊
COMPOSITE STRUCTURES
卷 159, 期 -, 页码 21-33出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2016.09.049
关键词
Composite beam; Multi-cell beams; Flexural confinement; Failure load; GFRP; Concrete in-fill; Concrete strength; Flexural behaviour
资金
- Ministry of Higher Education and Scientific Research-Iraq
This research introduces multi-celled glass fibre reinforced polymer (GFRP) beam sections partially filled with concrete. Hollow pultruded GFRP square tubes (125 mm x 125 mm x 6.5 mm) were bonded together using epoxy adhesives to form the beams using 2-4 cells. Concrete with 15 and 32 MPa compressive strengths was used to fill the top cell of the multi-cell beams. These beams were then tested under static four-point bending and their behaviour was compared with hollow beams. The results showed that up to 27% increase in strength was achieved by using multi-cell beams compared to a single cell beam. Filling in the top cell of the beams with concrete enhanced the capacity as well as the stiffness of the beams. The multi-celled GFRP beams filled with concrete at the top cell failed at 38-80% higher load and exhibited 10-22% higher stiffness than their hollow counterparts. The increase in the compressive strength of the concrete infill from 15 MPa to 32 MPa resulted in up to 14% increase in the failure load but did not enhance the flexural stiffness. Finally, the proposed prediction equation which account for the combined effect of shear and flexural stresses showed a good agreement with the experimental results for hollow cells and up to 3 cells of concrete filled beams. The bearing stress equation gave a better estimation for 4-cell filled section. (C) 2016 Elsevier Ltd. All rights reserved.
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