Floating bridge by Anoop

Floating Structure

1. FLO ATING BRIDGE Guided By: Presented By: Ms. Raseena CP Anoop K 1

2. O VER V IEW INTRODUCTION SITE SELECTION DESIGN CRITERIA ACTION OF PONTOONS ANCHORING SYSTEM ADVANTAGES CONCLUSION REFERANCE 2

3. I NTRODUCTION A bridge which floats on the surface of the water. No need of piers Cables. Supported by barge-or-boat-like pontoons. While pontoon bridges are usually temporary structures. Permanent floating bridges are economic construction. 3

4. Fig.1. Floating Bridge 4

5. 5 S ITE S ELECTION For crossing large bodies of water with unusual depth. Very soft bottom where piers are impractical. For a site where the water is 2 to 5 km wide, 30 to 60 m deep and there is a very soft bottom.

6. D ESIGN C RITERIA It will be a long life structure & low life-cycle cost It should meet functional, economical, and practical requirements. Perform reliably and be comfortable to ride on under normal service conditions. Sustain damage from accidental loads and extreme storms without sinking. Safeguard against flooding and progressive failure. 6

7. P ONTOONS These are the foundation for floating bridge. Simply hollow, water light vessels. Can be made up with even also heavy materials such as concrete. 7

8. Fig1.1 Concrete Pontoon 8

9. T YPES OF P ONTOONS There are two kind of pontoons are commonly used : 1. Continues pontoon (Fig. 1.1.1) 2. Separate pontoon (Fig. 1.1.2) 9

10. 10 Fig 1.1.1 Continues Type pontoon

11. 11 Fig. 1.1.2 Separate pontoons

12. A NCHORING S YSTEM For keep the bridge stationary and stable. Anchors with Mooring lines used for stability. The anchors are heavy structures. They take care about the longitudinal& transverse loads. 12

13. 13 Fig. 1.2 Pontoons with Anchors and Mooring lines

14. 14 There are many types of anchors there: Eg: 1 . Type A (fig. 1.2.1) 2. Type B (fig. 1.2.2) 3. Type C (fig. 1.2.3) 3. Type D (fig. 1.2.4)

15. 15 Fig 1.2.1 Fig 1.2.2

16. 16 Fig 1.2.3 Fig 1.2.4

17. A DVANTAGES OF FLOATING BRIDGE Cost effective Easy construction No disturbance for Ocean biodiversity. Do not directly affected by ground shakings from earthquakes. 17

18. SAMPLES FOR FLOATING BRIDGES 18 Ever-green Point Floating Bridge ( SR 520), Seattle ( fig. 2) 2. Lacey V. Murrow Memorial Bridge, Seattle Washington 3. Floating Bridge, Dubai 4. William R Bennett Bridge, Kelowna

19. 19 Fig.2 Evergreen point floating bridge (SR 520), Washington Supported by 21 pontoons Each 110m long 23m wide SR 520

20. 20 The world’s first  floating city Cost : $10 billion Residential capacity : 50,000 residents, 30,000 visitors,

21. C ONCLUSION We can construct any type of construction over water in future. There is no need for conventional piers or foundations. However, an anchoring or structural system is needed to maintain transverse and longitudinal alignments of the bridge. A floating bridge is basically a beam on an elastic foundation and supports. Vertical loads are resisted by buoyancy. Transverse and longitudinal loads are resisted by a system of mooring lines or structural elements. 21

22. R EFERANCE 1. Andrew, C. E., The Lake Washington pontoon bridge, Civil Eng., 9(12), 1939. 2. Lwin , M. M., Floating bridges —1993. 3. Google 4. Lwin , M. M., Bruesch , A. W., and Evans, C. F., High performance concrete for a floating bridge, in Proceedings of the Fourth International Bridge Engineering Conference, Vol. 1, Federal Highway Administration, Washington, D.C., 1995. 5.Wikipedia 22