i want to carry out a nonlinear static pushover analysis for a concrete dam, i'm using the concrete damage plasticity model for the above. i'm able to carry out the frequency analysis for the model, but after applying any kind of load the the job gets aborted in both static analysi and static riks analysis.

in static analysis it does not converge, whereas in  static riks analysis it says a zero displacement step ha been encountered and analysi cannot proceed..

can anyone please help me out tof this..

thanks in advance

shijo antony (IIT-R)