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Product Overview:
This tutorial explores the simulation of concrete-filled steel tube (CFT) connections subjected to reversed cyclic loading using Abaqus. Composite steel-concrete structures are widely utilized in civil engineering projects around the globe. Over the past few decades, CFT structures have gained acceptance due to their ability to combine the favorable ductility of steel with the compressive strength of concrete. One of the chief benefits of CFT columns compared to other steel-concrete composite systems, often referred to as mixed or hybrid systems, is that the internal concrete counteracts local buckling of the steel tube wall, while the steel tube enhances the resistance of concrete to spalling. Despite being an economical choice for composite construction, the application of CFT systems has been limited by the complexity of beam-to-column connections and the scarcity of practical construction experience.
In this simulation, the steel columns and beams are modeled as three-dimensional shell components, while the concrete is represented as a three-dimensional solid part.
For the steel material, an elastic-plastic model with a ductile damage criterion is used to forecast damage initiation and progression during cyclic loading. The concrete is modeled as an elastic material using the Concrete Damage Plasticity model, allowing for the prediction of tensile damage throughout the analysis. A general static step with a defined time period is selected, assuming perfect contact between the beam and column, as well as between the steel column and concrete. Fixed boundary conditions are applied to the top and bottom surfaces of the column, while displacements in the reverse direction are assigned to the two beams. A fine mesh is crucial for all components, particularly in the contact areas.
Upon completion of the simulation, various results—including stress distribution, damage metrics, tensile damage, strain values, and force-displacement diagrams—can be analyzed.
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