for my master thesis, I need to do dynamic analysis of a railway bridge. With the help of the template provided by Sofistik. I got to manage to get the first results and my acceleration is way too big (15 m/sec2) and honestly doesn’t make any sense. Now to make the acceleration smaller I tried to enlarge the del parameter by 0.80 and that is how I got a smaller acceleration(m/sec2). Now my question can I mix the two methods (Newmark-method and Modal Analysis) to have even a smaller acceleration if not what other choices do I have to do? Because I tried So many things and this is the only way to get an acceleration smaller than 3.5 m/sec2.
PS: The Eigenfrenquency and the loads are correct in my Modell I double-check them many times and with hand Calculation also