<p>The future Mass Rapid Train System line 1 in Mumbai implemented by Mumbai Metro One Private limited (MMOPL), is an elevated line of 12 km long. This project needed a Signature Bridge.</p><p>SYSTRA designed the line with U shape viaduct and this typical section was extended to this Signature Bridge.</p><p>It is set at the crossing with the Western Express Highway coming from the north to Bandra Worli Sea Link. It takes its name from this highway. Flying over two roadways, the highway and Andheri Kurla Road, it is set near the future WEH Station in a very congested site with heavy traffic, heavy crowds and inhabitants, with utilities underground and height limitation for the pylons due to the closeness of an airport. More, an environmental constraint consisting in a very aggressive atmosphere had to be integrated in the design.</p><p>WEH Bridge is a stay cable bridge of 5 spans: 23m, 23m, 86, 23m, 23m. It will support two tracks with a commercial speed of 80 km/h and 17t per axle. As long welded rails are used, the bridge is designed to avoid any dilatation device and to take into account seismic loads and the constraints of the UIC standards. Built with the cantilever method, the U shape deck implied a special design for the form traveler and specific stages of construction involved by the two intermediate piers working as anti-uplift piers.</p><p>An optimization of all elements was necessary to limit the weight and to provide a long life time in regard to the environmental constraint.</p>

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<p>Extradosed bridges can be an elegant and economic solution for bridges with spans ranging between 100 and 250m. This novel type of cable-supported bridges has become quite successful in recent years first in Japan and then all over the world.</p> <p>Experienced members of the international bridge community have come together in Working Commission 3 of IABSE to share their knowledge and to prepare an SED which provides the reader with guidance and practical advise that was not available so far. This book contains useful information regarding conceptual and structural design, analysis, construction, cost and typical properties of Extradosed Bridges.</p>

<p>The construction of the viaduct of the Nouvelle Route du Littoral (NRL) connecting Saint-Denis to La Grande Chaloupe in La Reunion is particularly challenging in terms of wind environment. In addition to being built in a cyclonic region, the 5.4 km long viaduct is being built in open sea, at 100 to 150 meters from the coast. The gust wind speed can go up to 64 m/s at deck level during a cyclone event. The height (10 meters) and length (270 meters) of the double truss launching girder makes it particularly sensitive to turbulent wind and induces significant additional wind load on the viaduct and the cantilever at construction during a cyclonic event. The 120-meter-long span and relatively large width (28 meters) of the deck also play an important part in the dynamic response of the whole.</p><p>The paper will first present how the local wind conditions and the aerodynamic properties of the deck and the launching girder were determined. The methodology used to perform the time history simulations of the viaduct during construction phase will then be described, as well as the main results for one of the studied configurations.</p>

<p>The project of the New Coastal Road (NRL) with a length of 12,5 km includes a 5,4 km viaduct divided in 7 viaducts of 770 m long entirely precast near the “Le Port” commercial harbor and completely assembled at sea. The project had to integrate environmental dispositions to protect the marine fauna. Set up at sea, geological maps and geotechnical surveys were needed to provide precise conditions of landing of the footing pedestal of piers. Specific temporary equipment were needed following the construction sequences elaborated by the technical studies. To precast the total viaduct, foundation, piers and segments of the decks with their unusual width of 28m, needed a significant site installation in order to meet the deadlines set in the schedule.</p><p>This paper deals with the organization set up by the contractors’s joint venture to manage the issues of the project during the studies stage before the construction works.</p>