Delhi Metro, India
Mott MacDonald carried out the detailed design of an 8km stretch
of elevated metro which runs between Yamuna Bank station and
Vaishali station, as part of the Delhi Metro (MRTS)
development.
The design, which was undertaken for the design and build
contractor, AFCON, includes two major balanced cantilever
bridges.
The viaducts comprise efficient, simply supported, prestressed
concrete box girders. Both balanced cantilever structures have
curved alignments in plan. The structural form of both bridges are
insitu concrete box girder balanced cantilevers built using a
travelling gantry. The 3-span structure has span lengths of 40m –
60m – 40m, and the 4 span structure has span lengths of 50m – 70m –
70m – 50m. The internal piers of the bridges are built into the
deck to minimise deflection due to train loading, and to obtain a
robust performance in the event of an earthquake.
The design was carried out in accordance with Indian Standards. The
RMSpaceFrame software was used for the global analysis.
