Tests of Reinforced Concrete Interior Beam-Column Joint Subassemblage with Eccentric Beams

Eccentric beam-column joints are used in construction for a reinforced concrete exterior moment resisting frame in buildings. But the effect of the eccentricity on the behavior of joint is not well known, due to lack of test results. So three specimens of one third scale reinforced concrete interior beam-column subassembladges were constructed and loaded to failure by statically cyclic load simulating earthquake, to obtain fundamental data including three dimensional deformation of beam-column joint. The test results indicated that the eccentricity in the joints led to lower capacity in story shear and severe damage of concrete on the side to which the center line of beam shifted to. Increasing in the joint shear reinforcement on the side of beam shifted to was not effective to mitigate the concentration of concrete damage at large displacement reversals, whereas it was effective to reduce the crack width at the small story drift loading stages. In the case of eccentric joint, large deflection to out-of-plane direction occurred and it seemed to have accelerated the concrete damage on the side of the joint the beams shifted to