PSI - Issue 17

B. Moussaoui et al. / Procedia Structural Integrity 17 (2019) 979–985 B.Moussaoui & Y.Bouamra & K.Ait tahar & al./ Structural Integrity Procedia 00 (2019) 000 – 000

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It is obvious that the comparison of the results generated using the model with FE and experimental results are in good agreement. The accuracy of the proposed procedure is also confirmed by the close values of peak stress, is the histogram, we can see that the differences of the peak stress value of specimens confined by GFRP are 1,5; 7,8; 11; and 9,6 % for x/h = 0; 0.25; 0.5 and 1 respectively. This indicates that the actual behavior of partially or fully confined concrete cylinders under compression loading can be accurately predicted by the FE analysis approach.

4. Failure mode

The analysis of the failure mode of specimens under compression test, allows us to better evaluate the contribution of the partial confinement by ‘GFRP composite materials on his strength and ductility as well as the localization of cracks and the rupture., the various findings show that for the unconfined concrete (C Ref) a classic failure mode of rupture is observed.

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Fig 6. Failure mode of specimens

The rupture of partially confined specimens (PCC-8 and PCC-16), is obtained in the unconfined area of concrete cylinders. It has a significant improvement on the macro-crack as shown in Fig 6. The presence of GFRP composites prevents the propagation of cracks in the confined part of cylinder, increase the deformability of the concrete, and thus, the behavior becomes ductile. For the fully confined specimens, we observe a significant improvement on the rupture load and the failure is obtained without a to tal breaking of the ‘GFRP composite ; The confined concrete degradation is more advanced than the control concrete (C Ref). 5. Conclusion The behavior of partially and fully confined concrete short cylinders with GFRP composites was studied and analyzed by the testing and FE analysis. The obtained results for the partially and fully confined specimens showed a gain in compressive strength of about 9.12, 15.55 and 32% for x/h = 0.25, 0.5 and 1, respectively, in comparison with the reference concrete cylinder (UC Ref). This means that the parameter x/h can modify the behaviors of confined concrete, and improving its strength and ductility; The finite element analysis results compared to the test results indicates that the actual behavior of partially or