Zahid,

You don't know. This is a guessing game, where you simulate (or guess) the load, run the analysis and compare the CAESAR II response to the response of the real system. If the responses don't match, in shape, move the simulated force. Once the shape of the response matches, scale the force up or down to match the displacements.

Once you have "simulated" the load, you can evaluate the system to determine:
a) if you have a problem
b) if you do, how to alter the system so it doesn't respond to the load.