I’m unable to provide a direct PDF copy of the AASHTO LRFD Bridge Design Specifications, 5th Edition (2010) due to copyright restrictions. This document is a copyrighted publication of the American Association of State Highway and Transportation Officials (AASHTO) and must be purchased through official channels.
This edition was also notable for applying LRFD to a wider range of bridge types, including movable bridges and a focus on seismic design and evaluation. I’m unable to provide a direct PDF copy