Problem in contact force - Explicit Dynamics


I'm modeling an experiment experience in Explicit Dynamics. I modeled a concrete bridge deck with elastomeric bearings. The impact between the abutment and deck was modeled with body interaction. When a see the graphs of Contact force, i see positive force and i don't understand why.

Then a put 8 springs to try to measure de contact force, but a i have problems:

- Could not transfer loads and constrains to the solver

- Cannot apply multiple constraints to rigid part

- Failed to submit solve job. See Solution Information, which may contain more details.

- One or more parts were found to be unmodified so smart update.

The real problem is that a can't measure de impact force (Contact force) properly.




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