The American Association of State Highway and Transportation Officials recently published the third edition of its “LRFD Movable Highway Bridge Design Specifications” guide.
[Above image by AASHTO]
This publication provides comprehensive Load Resistance and Factor Design or LRFD specifications for highway movable bridges, including structural, seismic, vessel collision, mechanical, hydraulic, and electrical details, plus establishes requirements for movable bridge operation and control.
The specifications in this third edition of the guide – which covers several types of movable bridges, including bascule, swing, and vertical lift – supersedes the previous 2007 second edition and its subsequent interim revisions.
AASHTO noted that this revised edition also includes the development and implementation of a consistent reliability-based methodology that is applied to machinery design and elsewhere, where practicable; optional site-specific wind loading, applied at the owner’s discretion; guidelines for operation of movable bridges from remote locations; and general updates to industry specification and code references, and material specification references.