Steel Plate Floors.

Steel plate used for floors, walkways or for staircase treads normally has a raised pattern of the non-slip type such as Durbar plate supplied by Corus.Where a plated area will have only occasional use, such as walkways for maintenance access, then plain plate may be used.

If properly designed, both plain and non-slip plates have a dual function in carrying floor loads and in acting as a horizontal diaphragm in place of a separatebracing system. For example, a plate may be connected to the top flange of crane gantry girders to act as a surge girder and also as a means of crane or maintenance
access; the surge girder elements should be designed as a horizontal plate girder.

When steel plate floors are in situations where moisture or high humidity is present, then the plates should be continuously welded to the support members to avoid corrosion problems. In dry areas connections may be fastened by bolting with countersunk bolts, intermittent welds, or clips. When clips are used they must be
arranged so that they cannot move out of position.

Plain plate is commonly available in grades S275JR and S355JR to BS EN 10025.

Durbar plate
The pattern of Durbar plate is shown in Fig. 30.1. The pattern is raised 1.5mm to 2.2mm above the plate surface.When ordering, the thickness should be specified as ‘thickness on plain’.

Durbar-pattern plate is free draining and can be matched width to length without affecting appearance.
Durbar plate is commonly available in grade S275JR and S355JR to BS EN 10025, also ‘commercial quality’ with a UTS not less than 355N/mm2.

Durbar plate
Fig. 30.1 Durbar plate

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