Abstract
This paper seeks to supplement existing information on the seismic behavior of eccentric connections by presenting an experimental study that focused on the effect of eccentricity of spandrel beams with respect to the column. Specimens included a floor slab and transverse beams to evaluate the effect of slab participation. Test results indicated that including the floor system significantly reduced the negative influence of eccentricity. Damage was reduced, specimens had fuller load-versus-drift hysteresis loops with high energy dissipation capacities, and deterioration of joint shear stiffness and strength were delayed. The joint shear stresses resisted by the connections, without major damage, also were higher than current design values due to the participation of a larger area of the joint region in resisting shear. These findings indicate that current ACI-ASCE recommendations for effective joint width of beam-column connections in monolithic reinforced concrete structures are conservative. Since joint shear distortions contributed significantly to the total story drift for all subassemblies, accurately predicting drift demands requires a joint model that accounts for the inelastic deformations in the beam-column connections.
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