The Open Construction & Building Technology Journal

ISSN: 1874-8368 ― Volume 15, 2021

Numerical Simulation and Experimental Investigation on Seismic Performance of Composite Structural Connection of Encased CFST Column and Reinforced Concrete Beam with Steel Ring

Aravind Raj Ponsubbiah1, Divahar Ravi1, *, Sangeetha S P1, Meenambal T2, Frieda F S3
1 Department of Civil Engineering, Aarupadai Veedu Institute of Technology, Chennai, India
2 Department of Civil Engineering, Adama Science and Technology University, Asasa, Ethiopia
3 Department of Civil Engineering, KCG College of Technology, Chennai, India



This paper discusses the seismic characteristics of the composite structural joint between the Encased Concrete Filled Steel Tubular (ECFST) Column and Reinforced Concrete (RC) beam. The hysteresis behaviour, envelope curves, ductility, rigidity degradation, energy absorption capacity, and equivalent viscous damping coefficient are also discussed.


In this study, the reinforcement placed longitudinally in the RC beam, which is disunited at the joint due to the tubular section of the ECFST column, is connected by providing links in the form of steel rings at the joint. In this study, four specimens with circular steel rings and square concrete casing along with two control specimens are considered. The number of ring layers and concentric rings are used in different combinations among the specimens.


The structural connection with the circular steel rings and square concrete casing at the ECFST column and RC beam joint showed superior seismic performance due to the provision of the longitudinal bar and the increased confinement at the joint due to the steel rings and additional concrete casing.


A comparative study was done between the experimental studies and the numerical analysis from the finite element developed using ANSYS. It was found that the experimental investigation results matched with the finite element analysis.

Keywords: ECFST, Reversed lateral loading, Concrete casing, Steel ring, Seismic performance of joints, Energy absorption capacity.

Article Information

Identifiers and Pagination:

Year: 2020
Volume: 14
First Page: 309
Last Page: 320
Publisher Id: TOBCTJ-14-309
DOI: 10.2174/1874836802014010309

Article History:

Received Date: 1/2/2020
Revision Received Date: 12/5/2020
Acceptance Date: 5/9/2020
Electronic publication date: 08/10/2020
Collection year: 2020

© 2020 Ponsubbiah et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at Department of Civil Engineering, Aarupadai Veedu Institute of Technology, Chennai, India; Tel: +919962144399; E-mail:

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