Abstract
This paper examines the effectiveness of using code design equations to evaluate gravity load capacity and lateral resistance of slab-column connections. The authors collected test data for interior flat-plate slab-column connections subjected to concentric gravity load and combined gravity and lateral loads. The connection strength was evaluated using ACI Code design equations. From test data, equations for connection gravity load capacity as a function of concrete strength, slab reinforcement ratio and yield strength, and the ratio of column size to slab effective depth were developed. A model for strength of connections subjected to lateral load using a beam analogy concept that includes resistance from flexure, shear, and torsion at the critical section is proposed. The analysis of the test data indicated that the capacity of slab-column connections estimated using the ACI 318-05 two-way shear design equations may vary considerably from the test results. The ACI design equations underestimated the unbalanced moment-carrying capacity of most connections tested, but the proposed equations can offer an alternative approach to evaluate the lateral strength of light-reinforced slab-column connections.
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