The CI Lock Up Device (LUD®)
The primary function of a CI Lock Up Device
(LUD) is to provide a temporary rigid link between the deck and supporting
abutments and piers of a bridge so that under fast-acting and short duration
seismic, traction, braking or accidental forces, the load is shared between the
supports. Under slow acting thermal, shrinkage or creep movements the CI LUD no
longer acts as a rigid link and moves with the deck. The LUD does not absorb
energy: instead it transmits a sudden load applied to it.