The Quarry Bridge
crossing the "Roichmen Quarry" was designed partly as
a pre-cast segmental balanced cantilever (414m) and partly as
a cast-in-place incrementally launched girder of 409m length.
The typical pre-cast segment length is 3.0m at its longitudinal
axis and the maximum length of a segment for the incrementally
launched part of the bridge is 22.5m long. The superstructure
of both parts is made of a box girder of 3.3m depth and 11m width.
Pier 2 is much shorter, and therefore stiffer, than the other
piers of this bridge. A special gap-element at the top of this
pier enables the rest of the columns to respond prior to this
pier in the event of an earthquake and by that prevent premature
failure. A non-linear gap element was implemented as part of a
pushover analysis in order to fine-tune the over-all earthquake
response of the bridge.