Wolchuk R.,Roman Wolchuk Consulting Engineers
Journal of Bridge Engineering | Year: 2014
The design methods recommended in the AASHTO 2012 specifications are based on analysis of the live load stresses in orthotropic decks without considering the greater effects of the stresses induced in the process of fabrication. Accumulated worldwide experience with orthotropic decks indicates that cracking occurs mainly due to the effects of fabrication, such as weld shrinkage and resulting residual stresses in geometrically restrained details, welding imperfections weld discontinuities, loose fabrication, and fitting tolerances. Understanding how the structure works is facilitated by using simple and transparent design procedures. A proposed standard 18,000-mm-long orthotropic deck panel with an 18-mm deck plate, rounded-bottom longitudinal ribs, and cross beams spaced at 8,000 mm is also necessary for bridge construction under the new specifications.