Hi,

I am trying to solve a single arched masonry bridge using an acceleration record. In the model, there are three structural elements, ARC, SPANDREL WALLS, and FILLER. I used CTP215 for the arch and SOLID185 for the other masonry components. I modeled all of them bonded to each other. I noticed that the convergence problem occurs as soon as the amplitude of the acceleration jumps to a larger value. Although I use an acceleration record of 3 s under transient structural analysis I could not get convergence.

Any help on how to overcome such a convergence problem is appreciated. 

Many thanks in advance.