Effect of self-stressing on concrete-encased-steel filled circular CFRP tubes under axial compression

AbstractThis paper presents an experimental investigation of overall buckling behaviour of carbon fibre reinforced plastic (CFRP) tubes with different off-axis ply orientations. A series of specimens are designed and prepared with stacking sequences [0∘4/±θ∘], with θ corresponding to either 0, 90, 45 or 60. Axial compression tests with effective end-reinforcement and hinge support are performed to investigate the overall buckling behaviour. With respect to the future design and application of CFRP tubes with this type of stacking sequence, column curves for each stacking sequences and all test data are fitted based on Perry-Robertson formula. With respect to the high stress level in the relatively short CFRP tube that facilitates the development of defects, test data present high levels of discreetness. We propose a strategy for engineering safe design in which a reduction factor is added to the original reduction factor based on statistical analysis when the universal slenderness ratio is less than 2.

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An analytical model of square CFRP tubes subjected to axial compression

Composites Science and Technology ◽

10.1016/j.compscitech.2018.09.019 ◽

2018 ◽

Vol 168 ◽

pp. 170-178 ◽

Cited By ~ 14

Author(s):

Rafea Dakhil Hussein ◽

Dong Ruan ◽

Guoxing Lu

Keyword(s):

Analytical Model ◽

Axial Compression ◽

Cfrp Tubes

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Experimental Study on the Axial Compression Behaviors of Short Rectangular Concrete Columns Encased in CFRP Tube

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.370 ◽

2011 ◽

Vol 250-253 ◽

pp. 370-373

Author(s):

Wen Bin Sun

Keyword(s):

Axial Compression ◽

Concrete Columns ◽

Compression Tests ◽

Stress Strain ◽

Concrete Core ◽

Cfrp Sheets ◽

Corner Radius ◽

Cfrp Sheet ◽

Axial Compressive Strength ◽

Cfrp Tubes

In this study, 9 short rectangular concrete columns with cross-section 150mm×300mm and height 600mm are prepared, they are 6 confined concrete columns encased in CFRP tubes and three concrete columns as control specimens. The tubes with fibers oriented at hoop direction are manufactured to have 3 or 5 plies of CFRP sheet with 10mm, 20mm, or 40mm rounding corner radius. To ensure proper bond, a 100mm overlap is provided in the direction of fibers. Axial compression tests are conducted to investigate the axial strengths, compression behaviors, stress-strain relationships, and ductility until the CFRP tubes rupture. It is evident that the CFRP tube confinement can improve the behaviors of concrete core, in terms of axial compressive strength or axial deformability. Experimental results also show that the stress-strain behaviors of confined specimens vary with different the layers of CFRP sheets and corner radius at vertical edges.

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