Learning Forum

[SULUN SHI]

Hi,

I am doing a concrete - rebar pullout test, as shown in the figure below.

I use Combin39 to define the interface.

In the X and Z directions, I use coupled degrees of freedom for the coincident nodes.

There are two options to apply the boundary conditions 

1) To fix the Y direction for the front face of the block. In other words, against the pullout direction.

2) To apply fixed boundary conditions on four sides of the block in x, y and z

What is the difference in the simulation when a tensile force is applied to the rebar? 

When the four sides of the block are fixed, is there tension in the block when the rebar is pulled?

Also, I tried to use the first option, but anays says that the degrees of freedom are over-defined. Hence, is the only possible way is option 2 ?

 

[Ashish Khemka]

Hi,

 

If the four sides are fixed and if you are pulling the bar then the tension should be seen in the model. With force application, you may face a convergence issue. 

 

Regards,

Ashish Khemka