Engineering and Construction

For initial design Fig. 4.15 gives approximate formulae for making first estimates of cable size and bending of the stiffening girders. The most severe condition for  the stiffening girder is with approximately one half of the main span loaded  asymmetrically

Fig. 4.15 Suspension bridges, approximate formulae (Pugsley). (a) Neglecting stiffness of deck; (b) including deck stiffness