Economical Seismic Retrofit Schemes for Vulnerable RC Buildings with Infill-Brick Wall Using New FRP Technologies

Abstract eng:
The idea of using FRPs for seismic retrofit of hollow brick infill walls of deficient RC frames was developed within the last decade. In those studies, surface bonded FRPs acting as cross braces integrated to the boundary frames were effective in increasing lateral strength. Keeping in mind that one of the most important issues is the cost effectiveness, more economical solutions with new FRP technologies can be employed. The concept of “sewing bands” emerged at this point for the seismic retrofit of initially for RC shear walls and later for RC frames with hollow brick infill walls. The applicability of sewing bands for seismic retrofit of deficient RC frames with infill walls was found to be promising. In this study, we present cyclic diagonal compression test results of brick infilled RC frames retrofitted with “sewing bands”. A simple design oriented mechanical model was developed to simulate the load-deformation response of the test specimens. Experimental results from diagonal compression tests reported herein and cyclic lateral displacement tests presented previously are compared with the model estimations. A reasonable agreement was observed between test results and model estimations showing that the model can be used in seismic strengthening of infill walls with sewing bands.

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