A simplified model for reinforced concrete beam-column joints under seismic loads
Tan, Kang Hai
Date of Issue2018
School of Civil and Environmental Engineering
This paper presents a simplified model for reinforced concrete beam–column joints under seismic loads. In the model, the beams, columns and the joint zone are assumed to remain rigid, and flexural deformations of the beams and column are concentrated at the joint interfaces. The compatibility condition of the joint is established in accordance with the rigid-plastic assumption. To correlate the flexural deformations of the beams and columns to strains of tensile reinforcement, piecewise linear strain profiles of tensile reinforcement are assumed along the beams and columns and slips of embedded reinforcement in the joint are also considered. Thereafter, the plane-section assumption is employed to determine the strain profiles at the joint interfaces. In calculating the compression force in concrete, the stress–strain model for concrete is used instead of the equivalent rectangular concrete compressive stress block. The rigid-plastic model was calibrated against published experimental results of interior and exterior beam–column joints in terms of load–displacement curves. Furthermore, the yield displacement of beam–column joints was calculated and verified by test data. Through the analytical model, forces transferred to the joint zone by tensile, compressive reinforcing bars and concrete can be quantified, which enables further development of the joint model to evaluate the shear resistance of beam–column joints.
Magazine of Concrete Research
© 2018 Thomas Telford (ICE Publishing). This paper was published in Magazine of Concrete Research and is made available as an electronic reprint (preprint) with permission of Thomas Telford (ICE Publishing). The published version is available at: [http://dx.doi.org/10.1680/jmacr.16.00074]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.