This document discusses floating bridges. Floating bridges are bridges supported by pontoons that float on water. They do not require piers and are a good option for crossing large bodies of water that are too wide or have bottoms too soft to support conventional bridge foundations. The document outlines site selection criteria, design considerations like stability and load resistance, and types of anchoring systems and pontoons used. It provides examples of existing floating bridges and concludes that floating bridges provide a cost-effective way to construct bridges over water without disturbing the environment.

1. Guided By: Presented By:
Ms. Raseena CP Anoop K
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2.  INTRODUCTION
 SITE SELECTION
 DESIGN CRITERIA
 ACTION OF PONTOONS
 ANCHORING SYSTEM
 ADVANTAGES
 CONCLUSION
 REFERANCE
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3.  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.
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4. Fig.1. Floating Bridge
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SITE SELECTION
 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. 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.
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7. These are the foundation for floating
bridge.
Simply hollow, water light vessels.
Can be made up with even also heavy
materials such as concrete.
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8. Fig1.1 Concrete Pontoon
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9. There are two kind of pontoons are
commonly used :
1. Continues pontoon (Fig. 1.1.1)
2. Separate pontoon (Fig. 1.1.2)
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10. 10
Fig 1.1.1 Continues Type pontoon

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Fig. 1.1.2 Separate pontoons

12.  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.
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Fig. 1.2 Pontoons with Anchors and Mooring lines

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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)

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Fig 1.2.1 Fig 1.2.2

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Fig 1.2.3 Fig 1.2.4

17. 1. Cost effective
2. Easy construction
3. No disturbance for Ocean biodiversity.
4. Do not directly affected by ground
shakings from earthquakes.
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1. 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

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

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

21. 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.
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22. 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
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