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Open Access

ARTICLE

Numerical Investigation of the Seismic Performance of RCS Connections with a Novel Simplified Detailing

Siyuan Feng, Guocai Lin*
Department of Engineering and Design, University of Auckland, Auckland, New Zealand
* Corresponding Author: Guocai Lin. Email: email

Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2026.083074

Received 28 March 2026; Accepted 19 May 2026; Published online 12 August 2026

Abstract

RC column-steel beam (RCS) structural systems have been extensively studied over the past few decades because they combine the advantages of steel beams and RC columns. The seismic performance of the system is strongly governed by joint detailing. Proper joint detailing is essential for achieving both satisfactory mechanical performance and constructability. A novel joint configuration, referred to as the whole column-section diaphragm joint, has been proposed and experimentally validated in previous studies, showing favorable seismic performance together with a simplified fabrication process. The objective of this study is to develop a detailed three-dimensional finite element model to investigate the seismic behavior of this proposed RCS joint configuration. The modeling method was validated against six cyclic tests of interior RCS joints with whole column-section diaphragms. The model reproduced the global hysteretic response, peak resistance, stiffness characteristics, and local joint shear failure observed in the experiments. Parametric analyses were conducted to examine the effects of axial compression ratio and face bearing plate (FBP) thickness and to derive design-oriented recommendations. The results indicate that, within the investigated parameter range, an axial compression ratio below 0.3 is beneficial for maintaining stable joint behavior, whereas increasing the parallel FBP thickness provides limited strength enhancement. Existing design provisions from ASCE, AIJ, and CECS 347:2013 were further evaluated. Based on experimental and numerical results, a modified CECS-based expression was proposed by modifying the concrete contribution to incorporate the effect of axial compression ratio, improving the prediction accuracy of joint shear strength for the investigated joint type.

Keywords

Reinforced concrete column-steel beam; beam-column joints; axial compression ratio; face bearing plate; seismic performance

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