International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 08 | Aug 2023
p-ISSN: 2395-0072
www.irjet.net
Numerical study on behaviour eccentrically loaded double circular steel tubular short columns filled with concrete N. D. Prakadhesh1, Dr. M. P. Muthuraj2 1PG Scholar, Department of Civil Engineering, Coimbatore Institute of Technology, Tamilnadu, India 2Associate Professor, Department of Civil Engineering, Coimbatore Institute of Technology, Tamilnadu, India
---------------------------------------------------------------------***--------------------------------------------------------------------Abstract 1. Introduction This paper presents a comprehensive comparative analysis between experimental results and numerical simulations using Abaqus software for concrete-filled double steel short columns. The study aims to validate the accuracy and reliability of the numerical model in predicting the structural behaviour of such columns under axial load and lateral loading conditions.
Circular concrete-filled double steel tubular (CFDST) columns are being increasingly used in high-rise and super high-rise buildings due to their exceptional strength and ductility. These columns consist of an inner concrete-filled steel tube strengthened by an outer circular steel tube filled with concrete. This configuration provides effective confinement to both the core concrete and the sandwiched concrete between the two tubes. While circular CFDST columns loaded axially have been studied, there's a lack of research on their behavior under eccentric loads.
The experimental investigation involved the fabrication and testing of a series of concrete-filled double steel short columns, varying in dimensions and reinforcement details. Load-displacement responses, load-carrying capacities, and failure modes were recorded during the experiments. Subsequently, an Abaqus finite element model was developed to simulate the behaviour of the tested columns. Material nonlinearities, concrete confinement effects and steel-to-concrete bond were considered in the numerical simulations.
The paper aims to address this gap by presenting experimental and computational investigations into the performance of short CFDST circular columns subjected to eccentric loading. The study outlines a comprehensive approach to analyze and model the moment-curvature behavior and strength envelopes of these columns. The research also considers the influence of various parameters, such as different concrete strengths and tube configurations, on the structural performance of eccentrically loaded CFDST columns.
Comparisons between experimental and numerical results were performed in terms of load-displacement curves, load capacities and failure modes. The agreement between the experimental and numerical results was assessed quantitatively, and the discrepancies were analysed to identify potential sources of differences. Factors such as material properties, boundary conditions, and modelling assumptions were critically examined to understand their influence on the simulation outcomes.
Existing design codes like Eurocode 4 and ANSI/AISC 360– 16 have not provided specific guidelines for designing circular CFDST beam-columns due to limited experimental and computational studies. This paper seeks to contribute to the understanding of the behavior of CFDST columns under eccentric loading conditions and provide insights that can inform future design practices.
The findings of this study contribute to the validation and refinement of numerical modelling techniques for concretefilled double steel short columns. The research enhances the understanding of the structural behaviours of such columns and provides insights into the effectiveness of Abaqus software in simulating their response under varying loading conditions. This work is valuable for structural engineers and researchers involved in the design and analysis of steelreinforced concrete structures, aiding in the development of more accurate and efficient design methodologies.
The investigation begins with a detailed presentation of the experimental test program and the obtained results. A nonlinear numerical analysis procedure is introduced to model the moment-curvature response and strength characteristics of CFDST columns. The accuracy of the numerical approach is verified through experimental validation. The paper then presents the findings of parametric studies conducted using the developed computer model, focusing on the structural performance of eccentrically loaded CFDST short columns.
Keywords: Concrete Filled Steel Column, Strength, Deflection, Abaqus.
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Although studies on axially loaded CFDST columns have been conducted in the past, this paper represents a pioneering effort in investigating the behavior of short CFDST circular columns under eccentric loading. The
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