Steel Designers Manual - TheBestFriend.org

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Steel Designers' Manual - 6th Edition (2003)
steel plate 200—250 mm
'flap' (typ)
surfacing
steel support
plates
(a)
300—500 mm
rubber body bonded on to metal anchor
support/surface plates
bolt
(c)
(b)
Joints 865
Fig. 28.16 Joints allowing for larger movements: (a) (b) 200–250 mm, (c) 300–500 mm
exterior walls or roof, but consideration of the size of the joint gap is necessary in,
say, a floor or roof joint where excessive gaps could prove hazardous to pedestrians,
or could lead to jamming of the joint through ingress of debris, etc.
Joints on bridge decks are subject to heavy localized effects from wheel loads and
corrosive effects from de-icing salts and spilt chemicals. As a result, the practicalities
of maintenance and perhaps eventual replacement of such joints should be considered.
The resistance to skidding of the surface of such joints is also important.
28.3.2.7 Load generation at joints
Frequently the loads generated by compression or extension of movement joints
are insignificant in terms of overall structural behaviour. In some cases, however,
the loads developed may be large enough to affect the design of other elements of