Structural Efficiency of Steel Stiffening Deck Systems in Suspension Bridges Due to Gravity Loads
Abstract
In this paper, suspended stiffened decks in suspension bridges are considered. Three
steel deck-stiffening systems are compared structurally; the plate girder, the box girder
and the stiffening truss. A three-span continuous suspension bridge model is considered.
Analysis is made by the second order non-linear deflection theory in its linearized form.
Developed software is used for the analysis to determine the induced tension in the
cable, moments, shears and deflections of the girders for any general live load case.
AASHTO criteria for steel girders are adopted. AASHTO highway live loads -HL 93-
are applied to Khartoum-Tuti Suspension Bridge in Khartoum, Sudan for each type of
the stiffening systems. Ten load cases are considered and discussed. Results have shown
that the most efficient type to resist gravity loads is the stiffening truss, followed by the
box girder and last is the plate girder