The 2010 edition is built on a design philosophy that ensures safety by applying statistically determined factors to both bridge loads and material resistances. Unlike older methods that used a single safety factor, LRFD uses separate factors to account for the variability of different loads (e.g., dead vs. live loads) and the uncertainty in material strength. Key limit states defined in Section 1 include:
ABBREVIATED TABLE OF CONTENTS. The AASHTO LRFD Bridge Design Specifications, Fifth Edition contains the following 14 sections and. store.transportation.org The 2010 edition is built on a design