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Title: Simplified Approaches for Estimating Yield Rotation of Reinforced Concrete Beam-Column Components

Author(s): Eyitayo A. Opabola and Kenneth J. Elwood

Publication: Structural Journal

Volume: 117

Issue: 4

Appears on pages(s): 279-289

Keywords: assessment; deformation components; design; effective stiffness; reinforced concrete (RC) columns; RC coupling beams; yield rotation

Date: 7/1/2020

Recent research studies have shown that provisions of current seismic assessment and design standards overestimate the effective stiffness of reinforced concrete (RC) components. The influence of slip and shear deformations on the elastic response of RC components is not adequately addressed by these provisions. This paper presents a methodology for estimating the yield rotation and effective stiffness of RC components. Based on first principles, a simple analytical approach accounting for the effect of bar slip and shear deformations is presented. Using a dataset of past experiments on RC columns, the adequacy of the simplified model is demonstrated. The approach is extended to RC components with high-strength steel. Furthermore, recommendations on effective stiffness of RC coupling beams are provided.


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