03 June 2022 0 10K Report

I am modelling earthquake load effect and a tunnel in Abaqus. I applied acceleration in the horizontal direction at the base of my model. I ran the job and got the output of A1 at the base (where I input), the acceleration at the base does not match the input. Why? I think it is affected by the time step selection. I use the dynamic implicit step, and the incrementation is automatic. How can I fix this?

Thank you.

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