L. Michel

Experimental Investigation of CF Anchorage System Used for Seismic Retrofitting of RC Columns

This paper investigates the suitability and effectiveness of CF anchorage system in strengthening the bond in between the CFRP retrofit sheet and structure junction. i.e. column beam or column slab junction. For this purpose, a detailed experimental program was conducted, which is presented here briefly. Five different anchorage systems are discussed here. Results of the experimental observations are discussed in the form of load-slip curves, ultimate capacity and failure modes. The test result, in general indicates that the use of CF anchor provides an enhancement in the overall seismic capacity of strengthened specimen.

Mechanical behaviour of slender RC walls under seismic loading strengthened with externally bonded CFRP

Recent post-earthquake surveys have highlighted the excellent performance of reinforced concrete (RC) wall-type structures compared to frame-type structures. Any damage observed in RC walls was primarily due to design and construction work flaws. To overcome these defects, strengthening of existing RC walls is mandatory. In this article, experimental results for six RC shear walls are discussed. The walls were designed to fail in flexure. Four out of the six specimens were strengthened externally with Carbon Fiber Reinforced Polymer (CFRP) strips bonded to the wall panel, and mesh anchors were introduced at the wall foundation joint to limit CFRP debonding. Two specimens, one RC alone and one RC strengthened with CFRP, were subjected to a static load test, and four specimens, one RC alone and three RC strengthened with CFRP, were subjected to cyclic load tests. The test results discussion includes load response, cracking pattern, strength, ultimate displacement and energy dissipation. The CFRP strengthening technique adopted worked well with respect to improving specimen strength, reducing deformity and dissipating energy.