How to calculate total load in a displacement control analysis in abaqus

Hi,

I'm modeling a pull-out test for FRP debonding. I,m using displacement control and used amplitude to define displacement control boundary condition for example

amp*

0,0

0.15,1.0

I used concrete damage plasticity model to define tensile damage of concrete and done abaqus explicit analysis with time period same as for amplitud,  i.e.,0.15

Now I want to plot load vs Displacement. For this I'm using the "sum" command in abaqus to add the magnitude of all the reaction forces on the fixed nodes but the load value is very low,  i.e.,less than 2kN but in actual experiment its about 15kN.

Am I calculating the load correctly or is there any other method to calculate the load?? Or any other suggestion regarding the model is appreciate. Thanks

Hammad Raza