Our company has used LARSA analysis software products quite extensively over the years, and we are considering investment in the module (a plug-in, of sorts, to their existing analysis package) that handles time-dependent effects of prestressed girders quite well. There is also a handy construction phasing module as well that is due sometime this year.
If you have any questions on its functionality, let me know. The writers of the software interact with our company a lot to refine their product, so I have gotten to know them well. Any question I can't answer, I am sure they can and would be happy to.
Good luck!
Mike