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.