CABLE STAYED BRIDGE

A typical cable stayed bridge is a continuous girder with one or more towers erected above piers in the middle of the span. From these towers, cables stretch down diagonally (usually to both sides) and support the girder

•This list of the largest cable-stayed bridges ranks the world's cable-stayed bridges by the length of main span (distance between the suspension towers). The length of the main span is the most common way to rank cable-stayed bridges.

•However, the size of the main span does often correlate with the eight of the towers and the engineering complexity involved in designing and constructing the bridge

•Cable-stayed bridges with more than three spans are generally more complex, and bridges of this type generally represent a more notable engineering achievement even where their spans are shorter.

Rank Name Country Longest span Comp. year Paylons

1 Sutong Bridge Republic of China 1,088 m 2008 2

2 Stonecutters Bridge Hong Kong 1,018 m 2009 2

3 Tatara Bridge Japan 890 m 1999 2

4 Pont de Normandie France 856 m 1995 2

5Third Nanjing Yangtze Bridge Republic of China 648 2005 2

10 Bandra-Worli Sea Link India 600m 2009 2

34 Vidyasagar Setu India 457.2m 1992 2

13 Rio-Antirio Bridge Greece 560m 2004 4

28 Ting Kau Bridge Hong Kong 475m 1998 3

88 Millau Viaduct France 342m 2004 7

 Yamuna Bridge at Allahabad India 260m 2000 3

Case study

Yamuna Bridge at Allahabad

•Allahabad District is surrounded by theYamuna and Ganges rivers to the north,east and south,•The adjacent Naini District across theRiver Yamuna is the industrial centerWhere communication, automobile,fertilizer, textile and related industryCompanies are located.•The only traffic route connecting thesetwo districts was the existing bridge overthe River Yamuna (Yamuna Bridge).

Yamuna Bridge at Allahabad

SITE DATALocation: latitude 25˚77’N longitude 81˚44’NCatchment area: 368302 km²Highest flood level:88.000mLowest bed level:66.139mLow water level:71.119m

MODULE 1FoundationPylon and pierCable stayedDeck

FoundationFoundation

Pylon foundation Other pier well

(P17 & P18) (P15,16,19,20)

Six well foundation in reinforce concrete (P15-P20) are provided for this module, with depth of about 40m in general.All this foundation are located in deep channel of river with maximum depth of about 22m at HFL.The foundation level is kept same for all 6 wells, at a depth of 59.0m below HFL,37.1m below lowest bed level.

Pylon Well

dsf

Other pier well

Pylon and pier

Pylon:The total height of the pylon frame Is 90.0m.Reinforced concrete grade M50 used.

15.0m

30.0m

13m

Pylon Dimensions & Reinforcement

Fig. 4a 4b

Pier:Reinforced concrete twin pier columns each with independent foundation are provided under each deck beam.Height of pier: 23.4 – 25.9mHexagonal section 3.5m wide and 3.0m thick.

FIG. 5

Pier Section

Cable stays

1 Stay arrangement A fan arrangement was selected for cabel2 Anchorage Stays are carried inside the girder through a steel pipe which project 1.8 m above deck and is closed by a neoprene sleeve fixed with stainless steel clamping bands. Neoprene dampers are also housed in the pipe. At upper anchorage at pylon top the stays are anchored into steel plates protruding from pylon by fork socket.

DECK1 Section The stayed deck has a simple familiar pre stressed concrete π beam section with low depth. The main span was 260m.2 Dimension• The stayed part of the deck module 1 extending from P16 to P19

has a uniform • overall depth of 1.5m yielding a slenderness ratio of 173.01• The deck slab is 25.1m wide and 0.25m thick between beams

spaced at 18.2m centers• The longitudinal beams are1.37 m deep and connected by

transverse cross beams at a spacing of 5.0 m

a

Typical solution of diff module

Prestressing

Longitudinal Girder with tendon position Cross Girder with tendon position

Fig 13

Fig 14

MODULE 2(SHALLOW CHANNEL BRIDGE)A post-tensioned π beam deck continuous over 9 simple supports spaced deck continuous over 9 simple supports.Supports are spaced at 60.0 m.The deck configuration is retained same as for module 1. Reinforced concrete twin hexagonal piers are provided with independent well foundation of 7.5m dia.

Fig 15

Longitudinal girder with Tendon position

MODULE 3 (VIADUCT)

Twin shallow plate beams with a transversely pre stressed slab is preferred.

The depth of beams of beams 2.0 m wide only 1.25m.The dack slab is 0.35 m thick

FIG 16

CONCLUSIONThe design of bridge project has realized the prime

objective of promoting appropriate technology and environment compatibility.

The 600 m deep channel crossing of the project applies to many large river crossing in India.

A large span of 250 meter could act as an alternative solution to protect our scared river

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