how to get the ultimate load for concrete beam in ansys?

hi,

I made a model for concrete beam , and apply the load as load steps, and
then I made static non-linear analysis , but.....how con i define the
critical or the ultimate load that the concrete beam can stand before
collapse and how can I now the results for each load step? how can I
draw the (load - deflection)curve for the beam???

thanks.