Characteristics of CFRP retrofitted hollow brick infill walls of reinforced concrete frames

Berk Ozsayin, Emre Yilmaz, Medine Ispir, Hasan Ozkaynak, Ercan Yuksel*, Alper Ilki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


The mechanical characteristics of infill walls retrofitted with carbon fiber reinforced polymer (CFRP) sheets are really important for the realistic prediction of seismic performance of the vulnerable reinforced concrete (RC) frames retrofitted through CFRP strengthened infill walls. In this study, 36 hollow brick wall specimens were tested either under uniaxial compression or diagonal tension before and after retrofitting externally with CFRP sheets. The test parameters are the dimensions of the walls, the orientation of holes of bricks, the type of mortar, the amount of CFRP sheets and the details of strengthening application. At the end of the tests, a significant contribution of CFRP sheets on the mechanical characteristics of hollow brick walls was observed in terms of several important structural design parameters such as Young and shears moduli, axial and shears strengths as well as the deformation capacity. Finally, the strength and deformability characteristics of the walls and frames retrofitted with CFRP sheets were predicted analytically. The predictions were in good agreement with the experimental data.

Original languageEnglish
Pages (from-to)4017-4024
Number of pages8
JournalConstruction and Building Materials
Issue number10
Publication statusPublished - 10 Oct 2011


This study was conducted at the Material Laboratory and the Structural and Earthquake Engineering Laboratory of Istanbul Technical University. It was partly sponsored by research project 106M050 of the Scientific and Technological Research Council of Turkey (TUBITAK) and by BASF Company. The authors are thankful to the supporters.

FundersFunder number
BASF Company
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu


    • CFRP
    • Hollow brick
    • Infill wall
    • Seismic retrofitting


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