RE: Instantaneous Deflection with cracked sections

I would use the load history deflections to determine this deflection. A load step may be defined with a 0 day duration if you wanted an instantaneous deflection. A non-zero day duration is not required. Please note that the shrinkage restraint may also contribute to cracking. See the following web page for more information on the shrinkage restraint percentage and other load history parameters:

http://communities.bentley.com/products/structural/structural_analysis___design/w/structural_analysis_and_design__wiki/6191.aspx

Karl Gullerud