Abstract
Taking layer of the transverse CFRP and compressive strength of the concrete as the main factors, the shearing behaviour of overall 8 concrete filled square CFRP-steel tubular (CF–S-CFRP-ST) specimens and 3 concrete filled square steel tubular specimens are tested. On the basis of test results, the shearing force-displacement curves of all specimens can be classified three stages. Increase of layer of the transverse CFRP can improve the shear capacity of the specimens, while the elastic stiffness of the curve changes a little. Increase of compressive strength of the concrete can improve both the shearing load carrying capacity and the elastic stiffness. The shape of the curve of the specimens is not sensitive to the layer of the transverse CFRP and the compressive strength of the concrete. It is found that the simulated shear loading-displacement curves agree reasonably well with the experimental ones by using software ABAQUS. Using this verified numerical model, parametric study is conducted to explore the influence of principle factors on shear behaviour of concrete filled square CFRP-steel tube. Finally, the calculation formula of CF-S-CFRP-ST shear capacity is established, and the calculated results of this formula are in good agreement with the experimental results.
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