Yamuna Bridge Analysis

Signature Bridge
The Yamuna Bridge at Wazirabad is an unsymmetrical cable-stayed bridge with a span of 251 meters and length of 675 meters. The bridge’s composite deck carries 8 lanes (4 in each direction). It is about 35 meter wide and is supported by lateral cables spaced at 13.5 meters interval. The height of the steel tower is approximately 150 meters.
The area around the bridge will later be developed into a park and the Yamuna River will be widened to lake like dimensions.
At the same time design evolves from well proven structural solution such as slender composite deck. Such a deck was used for first time for second Hooghly Bridge in Kolkata, the first cable-stayed bridge in India, and has become a common practice worldwide.
The bridge
The deck is formed of outer I-shaped longitudinal main girders and I-shaped cross girders at 4.5 meters interval. A third central main girder is placed to distribute heavy truck loads onto several cross girders. All structural steel is S355.
The precast deck slabs of concrete grade M50 span 4.5 meters. Their standard thickness of 25 cm increases to 70 cm at the main tower.
The composite deck not only permits quick and simple erection but also offers economical advantage of having concrete balancing the horizontal cable thrust, a cost-free prestress. The deck is transversally supported on both ends of the bridge and the pylon.
Cables 
The deck is supported by two cable planes. The cables are directly anchored to the webs of the outer main girder at 13.5 meter distances with their dead end, and are stressed with the stressing chambers at the top of the pylon. The cables will be made of bundles of parallel o.6” strands of grade 1770. Depending on the location the number of strands per cable varies from 55 to 123nos. at the main span and is 127 nos. for each of the
The layout of upper part of pylon allows for large scale artistic painting which is not possible with pylon of conventional cable-stayed bridges.

Due to its inclination the pylon weight can compensate a significant part of dead load of main span. The able support parts of deck span 251 meters crossing the area of future lake without support to the ground.
The pylon is located towards eastern shore, forming a gateway that connects Wazirabad area to New Delhi.
The pylon consists of two legs made of steel boxes which merge into upper pylon zone, where the cables supporting the main span and the backstays are anchored and interconnected. The pylon is monolithically connected to the deck. It introduces horizontal forces in longitudinal direction into the concrete of the deck.
The major part of the steel for the pylon will be of grade S355. In very highly stressed zones, such as the area where the pylon is bent, grade S460 steel is used. Above the top most cable anchorage, the pylon rises further to about 20 meters forming the pylon head, a glass-covered steel structure that houses the illumination