Behavior of steel beam to concrete filled tube (CFT) column connection in Abaqus

Product Overview

In this project, the behavior of a steel beam-to-concrete-filled tube (CFT) column connection is simulated in the Abaqus software.

The numerical model is developed to investigate the structural behavior of the connection between a steel beam and a concrete-filled steel tube column under the applied loading.

What You Will Learn

• How to model a steel beam-to-CFT column connection in Abaqus.
• How to model the steel beam and concrete-filled tube column.
• How to define the nonlinear behavior of concrete using the Concrete Damaged Plasticity (CDP) model.
• How to define the tensile and compressive behavior of concrete.
• How to model the interaction between the steel tube and concrete core.
• How to define the material properties of steel and concrete.
• How to apply the loading and boundary conditions.
• How to perform nonlinear analysis of the connection.
• How to investigate concrete compressive damage.
• How to investigate the deformation and buckling of the beam.
• How to obtain the force–displacement response from Abaqus.
• How to compare Abaqus results with experimental results.
• How to validate an Abaqus model using experimental results.

Model Description

As you observe in the picture, the model consists of a steel beam and a concrete-filled steel tube column.

The steel tube is filled with concrete to form a concrete-filled tube (CFT) column.

The numerical model is developed according to the configuration of the experimental specimen reported in the reference article.

Concrete Material – CDP Model

In this project, the Concrete Damaged Plasticity (CDP) model available in Abaqus is used to define the nonlinear behavior of the concrete inside the steel tube.

The CDP model is used to represent the nonlinear behavior of concrete under both compression and tension.

The two main failure mechanisms of concrete, compressive crushing and tensile cracking, are considered in the numerical model.

The compressive and tensile behavior of concrete are defined using the corresponding stress–strain relationships, while the damage parameters are used to describe the degradation of concrete stiffness.

Compressive Damage of Concrete

The compressive damage of the concrete is also investigated using the Concrete Damaged Plasticity model in Abaqus.

As you observe in the picture, compressive damage has developed in the concrete core due to the applied loading.

The compressive damage parameter is used to evaluate the degradation of the concrete under compression and to identify the damaged regions within the concrete core.

Steel–Concrete Interaction

The interaction between the inner surface of the steel tube and the concrete core is defined to reproduce the composite behavior of the CFT column.

The steel tube provides confinement to the concrete core, while the concrete contributes to the overall behavior and load-carrying capacity of the composite column.

Experimental Model

The experimental specimen used in the reference study is reproduced numerically in Abaqus.

The geometry, material properties, loading conditions, and boundary conditions of the numerical model are defined according to the experimental configuration.

Loading and Boundary Conditions

The loading and boundary conditions are defined according to the experimental test setup in order to reproduce the behavior of the connection in Abaqus.

The nonlinear response of the steel beam, CFT column, and connection region is then obtained from the numerical analysis.

Force–Displacement Diagram

The force–displacement diagram is obtained from the Abaqus analysis to evaluate the structural response of the steel beam-to-CFT column connection.

The numerical results obtained from Abaqus are compared with the experimental results reported in the reference article.

Comparison of Abaqus and Experimental Results

As shown in the figure, the Abaqus results are compared with the experimental results reported in the reference article.

The numerical and experimental force–displacement curves show good agreement, demonstrating that the Abaqus model can appropriately reproduce the behavior of the tested connection.

Deformation and Buckling of the Beam

The deformation of the steel beam and the connection region can be investigated from the Abaqus results.

As you observe in the picture, the web and flange of the beam have buckled under the applied loading.

Numerical Results

The results obtained from the Abaqus analysis are used to investigate the behavior of the steel beam-to-CFT column connection.

The deformation, stress distribution, concrete damage, and response of the connection can be investigated from the Abaqus results.

Validation

This project has been validated by comparing the results obtained from Abaqus with the results reported in the reference article.

The good agreement between the numerical and experimental results demonstrates that the Abaqus model can reproduce the behavior of the steel beam-to-CFT column connection.

Key Features

• Steel beam-to-concrete-filled tube (CFT) column connection.
• Nonlinear finite element analysis in Abaqus.
• Concrete modeled using the Concrete Damaged Plasticity (CDP) model.
• Concrete tensile cracking and compressive crushing behavior.
• Investigation of concrete compressive damage.
• Steel–concrete interaction.
• Investigation of the composite behavior of the CFT column.
• Force–displacement diagram obtained from Abaqus.
• Comparison between Abaqus and experimental force–displacement results.
• Buckling of the beam web and flange.
• Investigation of deformation and stress distribution.
• Validated Abaqus model.
• Complete Abaqus CAE and INP files.
• Excel results file.
• Reference research paper.
• Step-by-step video tutorial.

Reference

This project is based on the reference research article used for experimental validation. The paper is included with the project files and can be used to review the experimental setup, material properties, loading procedure, and reported results.