Experimental Results and Conclusions Obtained On the Masonry-Infilled Concrete Frames Strengthened by CFRP

摘要

Due to various deficiencies and inadequacies of lateral stiffness, many reinforced concrete buildings are highly damaged or collapsed throughout the world and especially in Iran during the last major earthquakes. The main objective of this extensive experimental program is to strengthen the concrete frames and masonry infills using CFRP to improve the behavior of such buildings under sever seismic loading. Four 1/2 scaled 1-story, 1-bay brick infilled concrete frames were tested; namely, a control specimen and three rehabilitated specimens. CFRP sheets were wrapped around the different regions of the column to prevent the shear failure. Further, CFRP sheets were attached to the masonry wall faces and anchor to the corners of the concrete frame to carry diagonal tension. The specimens were tested under reversed cyclic quasi-dynamic load up to the failure and consequently strength, stiffness, and story drifts of the test specimens were 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 and improved results obtained during testing. Finally a series of recommendations is proposed for the actual use of CFRP's in the industry.