Experimental Behavior of Brick-Infilled Concrete Frames Strengthed by CFRP with Improved Attaching Technique

Abstract eng:
Due to various deficiencies and inadequate lateral stiffness many reinforced concrete buildings are highly damaged or collapsed in Iran and throughout the world during the last major earthquakes. In this study, retrofitting of undamaged infilled reinforced concrete frames using Carbon fibre-reinforced polymer (CFRP) is discussed in detail. The main objective of the extensive experimental program is to reinforce the masonry infilled concrete frames, which are known to contribute to the seismic performance of the reinforced concrete structures significantly and to improve the behavior of such buildings to prevent total collapse. CFRP sheets are wrapped around the column to prevent the shear failure. CFRP sheets are attached to the masonry wall faces and anchor to the concrete frame to carry diagonal tension. The frame of the specimens is designed and detailed in accordance to the old codes. Four 1/2 scaled 1-story, 1-bay brick infilled concrete frame are tested; namely, a control specimen and three rehabilitated specimens. The specimens are tested under reversed cyclic quasidynamic load to the failure. Strength, stiffness, and story drifts of the test specimens are determined. The control specimen showed combined brittle column shear and corner crushing infill failure modes while the rehabilitated specimens showed a more ductile failure mode. This paper is to discuses specific design, test setup, analytical and theoretical background as well as improved results obtained during testing. Finally a series of recommendations is proposed for the actual use of CFRP's in the industry.

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