Mumbai is developing an ambitious construction development to extend the metro network in order to improve the mobility of a city with more than 18 millions inhabitants.
PEDELTA, in joint venture with the local company CES and Ardanuy, carried out the preliminary design for a new elevated viaduct for the corridor Gatkopar-Mulund in the north east of the city.
The viaduct is more than 7 mi (12 km) long and is part of one of the main corridors. The project includes 13 metro stations. The main viaduct is formed by a succession of stretches between stations with spans of 82 or 98 ft (25 or 30 m) (simply supported).
The viaduct consists of two independent identical U channel pre-stressted concrete (PC) girders, one for each track, spaced at 0.5‘‘ (0.02 m) between central webs. The deck consists of one U-Channel girder 7 ft (2.15 m) in depth. The girder is continuous to increase its stiffness and to reduce deflections and vibrations while keeping the same depth as the rest of the viaduct. The internal pre-stressing (PT) consists of about 14 cables of 19 strands, 0.6” in diameter.
From an aesthetic point of view, a U girder reduces the visual height of the structure. A careful design of the external surfaces has done, creating a multiplane surface to reflect lines of the horizontal alignment and reinforce the shadows to make the girder appear thinner due to the edge line and varying shades of reflective light.
The preliminary design has been carried out meeting the Indian Codes and other technical requirements of the last version of Eurocode 1 (part 2, bridges) that includes modern criteria for the verification of Serviceability Limit States.