Finite element implementation of a steel-concrete bond law for nonlinear analysis of beam-column joints subjected to earthquake type loading

Realistic steel-concrete bond/slip relationships proposed in the literature are usually uniaxial. They are based on phenomenological theories of defor mation and degradation mechanisms, and various pull-out tests. These relati onships are usually implemented using different analytical methods for solv ing the differential equations of bond along the anchored portion, for part icular situations. This paper justifies the concepts, and points out the as sumptions underlying the construction and use of uniaxial bond laws. A fini te element implementation is proposed using 2-D membrane elements. An appli cation example on an interior beam-column joint illustrates the possibiliti es of this approach.