Flexural Behavior of Concrete Filled Square Steel Tube with Inner CFRP Circular Tube in Abaqus

In this tutorial, Flexural Behavior of Concrete Filled Square Steel Tube with Inner CFRP Circular Tube in Abaqus has been studied. Owing to the development of concrete technology and the demand of practical engineering, high strength concrete has been widely used in construction. The weakness of high strength concrete is its frangibility, and an effective way to improve the problem is filled in steel tube. This new type of hybrid member is in the form of concrete-filled square steel tube columns with inner CFRP (carbon-fiber-reinforced polymer) circular tube, composed of a CFRP inner tube and a steel outer tube with concrete infill the two tubes. The composite member can make good use of mechanical property of steel tube, CFRP and high strength concrete. The main advantage of Concrete-filled Square Steel Tube (CFST) columns in structural properties is due to the composite action between the constituent elements. The steel and CFRP tube provide confining pressure to the concrete, which puts the concrete under a tri-axial state of stress, and the strength of concrete is increased by the confining effect of the steel tube. On the other hand, the steel tube is stiffened by the concrete core. This can prevent the steel tube from buckling and increase the stability and strength of the column. It is obvious that the flexural behavior of CFST is inferior to compression performance

The outer steel box and CFRP tube are modeled as a three-dimensional shell part. the concrete core is modeled as a three-dimensional solid part. You can see a figure of the assembled parts at below

CDP material model is used to show concrete behavior under bending load. The elastic-plastic model with ductile damage criterion for the steel box and elastic property with Hashin’s damage criterion for the CFRP are used. These material model can predict damage and failure during the simulation. The dynamic explicit procedure is used to model the dynamic behavior of the bending process, but by using a smooth amplitude the quasi-static simulation can be obtainable. The general contact algorithm with contact property among all parts and specific property between steel box and concrete to consider the separation during the simulation such as friction coefficient, shear stress limit, and elastic slip are used. The fixed boundary condition is assigned to the bottom rigid bodies and displacement is assigned to the top rigid body. The mesh should be fine to predict damage and failure in a proper way

After the simulation all results such as damage, stress, strain,…..can be achievable. You can see some figures for the result below

You can provide CAE ,INP,and English video files of this simulation here. The cost of these files is Twenty-Nine Euros. you can click on the bellow bottom to beginning process

You can purchase the tutorial through a PayPal account, a Visa, or a Master card,  just before payment,send me an email to this address: karampourp@gmail.com