Lateral Drift Limits for Structural Concrete Slab-Column Connections Including Shear Reinforcement Effects
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The paper seeks to inform readers of recent updates to the ACI 318 code for slab-column connections and to provide the basis for these provisions, especially with respect to the specified lateral drift limits. In addition, recommendations in ACI 352.1R-89 relevant to slab-column connections subject to combined shear and unbalanced moment transfer are discussed. As noted in the paper, the ACI 352.1R-89 report is limited to reinforced concrete slab-column connections with no shear reinforcement. However, this report is currently being updated to include both post-tensioned and reinforced concrete slab-column connections, along with shear reinforcement recommendations. This paper summarizes the recommendations of the authors, and does not necessarily reflect the final content in the update to ACI 352.1R-89. While many of the recommendations presented in this paper are consistent with ACI 318-08, more conservative recommendations are made in some cases based on recent research. It is important to note that the potential for brittle punching shear failures at slab-column connections under inelastic deformations could lead to serious damage or collapse of a structure. Therefore, the importance of retaining the structural integrity of these connections cannot be overemphasized. More information on design and detailing considerations not covered in this paper can be found in ACI 352.1R-89 and ACI 318-08. 2009 ASCE.
