STRESS TRANSFER MECHANISM OF INDIRECT JOINT IN RETROFITTING METHOD BY EXTERNAL STEEL FRAMES

Abstract

In the strengthening method for R/C buildings proposed by authors, steel frame is connected to the existing R/C frame through indirect joint. Experimental study was conducted, and the observed results suggested that that the steel frame restrains the increase of crack width of R/C column caused by reversal loading, and the strengthening effect can be performed without anchors in indirect joint of column. In order to support this finding theoretically, 3D FEM analysis is applied for shear failure R/C specimen. In this paper, it is discussed about the results of analysis and evaluation of stress transfer mechanism of indirect joint.