A grillage analysis for a two-span footbridge comprising 2 main beams supported on pinned or rotational springs using stiffness matrices based on 3 degrees of freedom at each joint – vertical deflection and 2 rotations. Loading is by joint forces or moments in 2 directions. Optional support conditions allow integral bridge decks to be analysed. A separate differential settlement analysis is included for integral bridges.

Contents (33 pages)

• General arrangement allowing definition of geometry
• input data for beam and support properties
• loading input and results summary for key shear, moment and displacement results
• matrix parameters and full set of results
• differential settlement analysis
• validation using moment distribution analysis
• The lowest natural frequency has is calculated using inverse vector iteration.