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3.3 Cross girders

twice the length of cross girders

O In general all cantilevers greater than 0,50 m and supporting railway actions need a special study. (**) It is recommended to apply fa for open decks

Table 6.2: (cont)

Case

Structural element

Determinant length Lé

Deck Plate with ballast bed (concrete structures) (for local and transverse stresses)

4.1 Deck slabs as part of box girders or upper flange of main beam

- spanning transversely to the main girders

- spanning in the longitudinal direction

- transverse cantilevers supporting railway loading

4.2 Deck slab continuous over cross girders (in main girder direction),

4.3 Deck slab for trough bridges:

- spanning perpendicular to the main girders

- spanning in the longitudinal direction

4.4 Deck slabs spanning transversely between steel beams embedded in concrete

4.5 Longitudinal cantilevers of deck slab

3 times span of deck plate

3 times span of deck plate or determinant length of main girders; whichever is the lesser e

- e s 0,5 m: 3 times the distance between the webs

- e > 0,5 m: seen twice the cross girder spacing twice span of deck slab twice span of deck slab or determinant length of main girders; whichever is the lesser twice the determinant length in the longitudinal direction

O In general ail cantilevers greater than 0,50 m and supporting railway actions need a special study. The cantilevers shall be designed in consideration of the acceleration of the bridge. A full dynamic analysis shall be carried out with the vehicle characteristics accurately modelled.

Table 6.2: (cont)

Case

Structural element

Determinant length

Main Girders

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