# ABAQUS Post processing

I have modeled a pile which was made to penetrate at a constant rate (Displacement controlled loading) into the soil. The steps were divided into geostatic, contact and Applied load steps. After the program runs successfully, i am facing difficulty in extracting the results.

I want to plot the load vs. displacement curve at the bottom of the pile.  After i have summed up all the nodal forces at the bottom of the pile, the total load was coming quite less as compared to the applied Load/Displacement.

Kindly suggest me, how to compute the Load vs.  Displacement curve from displacement controlled loading at pile base.

Thanking you,

Tanmoy Kr. Deb

### Abaqus post processing

Hi Tanmoy,

if you are applying displacement control loading, How do you know the  applied load in advance? . also make sure that you are selecting all the nodes with reaction forces.

After applying the displacement controlled load, form the force equilibrium method, the load coming from displacement can be found out.

As the pile i have mentioned, is embedded into the soil domain and boundry conditions are applied only to the soil domain. Hence i would get nodal force in the pile base.

I have obtained the result by creating several paths, which is quite complicated. I would like to know is there any other method available to find out the total nodal force at the pile base using ABAQUS.

### Abaqus

You can use sum function at operate xy in the abaqus post processing to sumup all the reaction forces..Otherwise you may also use constrain eqaution so that at any single node all the reaction forces can be obtained.

Thanks,

Let me make it simple, suppose i am simulating a cube of sides 10 units. I have applied the load as pressure of 16 units at top. The cube is meshed by usign a global seed size of 5. It means, there are 9 elements and 27 nodes (using C3D8R). I have used the material property of steel for instance. The base of the cube is fixed and the sides are allowed to move vertically.  Now i want to calculate the nodal force at the centre of the cube i.e. at the centroid of the cube (not in the centre of any of the exterior sides).

"Sum" function in operate XY data is not appropriate, as i got a combination of positive and negative values for nodal force (not reaction force which are obtained only at supports) in vertical direction, if  that particular node located at the centroid is chosen. Is there a direct way of getting it.

Thanking you,

Tanmoy Kr. Deb 