Development of a Joint Deformation Model for use in Push-Over Analysis of R/C Frame Structures (sponsored by NSF)

The first purposes of this research project is to develop a model capable of accurately reproducing the inelastic response of R/C beam-column joints to be incorporated into push-over analysis computer programs. This joint model will account for joint deformations due to rebar slip or pullout from the joint, and deterioration of shear strength and stiffness within the joint. There is ample experimental data to characterize these inelastic behavior modes for "standard" beam-column joints, but test data is lacking for some non-standard connections. Thus, the second purpose of this research program is to examine existing data and generate additional information on the inelastic response of eccentric beam-column joints, which are common in exterior frames of older concrete structures and still occur in some modern concrete frames due to architectural requirements. The experimental phase of this research program consists of the lateral load testing of five eccentric joint specimens including transverse beams and floor slab. These specimens will be subjected to bi-directional loading, but only one plane at a time.

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