Abstract
Bond failure either in member or in beam-column joint degrades much of ductility of structural frame. This study developes a relatively simple method of analysis considering bond-slip characteristics, and examines the applicability of the method. The analytical method utilizes uniaxial constitutive models of steel, concrete, and bond. The yield plateau of steel was considered. Equations of compatibility and equilibrium of bond-slip were integrated along main bar by finite difference method. In the proposed method of analysis, the member section was assumed not to remain plane after crack. In order to examine the applicability of the assumption, another method was developed assuming that the section at the midspan of the member remained plane after crack. Antisymmetrically loaded beams with no bond along main bar in member were analized by the above two method, and compared with the experimental results. The analytical results of the proposed method showed better agreement with experimental results than those of the latter method. The effects of the constitutive models of concrete were also examined. The results by Umemura's e-function model showed a good agreement with experimental results.
