Bridge Presentation Nha

7/29/2019 Bridge Presentation Nha

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BRIDGE DESIGN

By:

Rhonda Divina Amores-Rapirap

KINDS OF BRIDGES

NORMAL BRIDGE - perpendicular to the flow of water

SKEWED BRIDGE - follows the flow of water CURVED BRIDGE

TYPES OF BRIDGE

By Construction

Steel Bridge

Concrete Bridge

Prestressed Concrete Bridge

Timber Bridge

Aluminum Bridge

TYPES OF BRIDGE

By Span Lengths

Short-Span (6-40 meters)

Medium-Span (40-100 meters)

Long-Span (over 100 meters)

By number of Decks

Single Deck Double Deck

Combination


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TYPES OF BRIDGE

By Structural Form

Slab Bridges

TYPES OF BRIDGE

Reinforced Concrete Deck Girder Bridges

TYPES OF BRIDGE

Slab-Stringer Bridges

TYPES OF BRIDGE

Truss Bridges


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TYPES OF BRIDGE

Rigid Frame Bridges

TYPES OF BRIDGE

Arch Bridges

TYPES OF BRIDGE

Cantilever Bridges

Quezon Ave. - EDSA Flyover

Cable-Stayed Bridges

TYPES OF BRIDGE

Suspension Bridges

TYPES OF BRIDGE

By Span Types

Simple

Continuous

By Position

Stationary

Movable

TYPES OF BRIDGE


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TYPES OF BRIDGE ELEMENTS OF BRIDGE

Main Elements Abutment - end to end structure of the bridge

Pier - inner structure of the bridge

ELEMENTS OF BRIDGE

Detailed Elements

Superstructure

Deckslab

Guardrails

Sidewalks

Truss

Cable and Hangers

Beams / Girders

Flatslab Girder

ELEMENTS OF BRIDGE

Beams / Girders

Flatslab Girder

ELEMENTS OF BRIDGE

Beams / Girders

Reinforced Concrete Deck Girder (RCDG)

ELEMENTS OF BRIDGE

Beams / Girders

Pre-Stressed Concrete Deck Girder (PSDG)


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ELEMENTS OF BRIDGE

Beams / Girders Steel Deck Girder

ELEMENTS OF BRIDGE

Beams / Girders Voided-Slab Deck Girder

ELEMENTS OF BRIDGE

Detailed Elements

Substructure

Coping / Cap Beam

Column / Wall

Footing / Pile Cap

Piles

ELEMENTS OF BRIDGE

LOADS ON BRIDGES

Dead Load

Selfweight

Future Wearing Surface

Superimposed Loads - deadweights of guardrails,

sidewalks, utilities connected to the bridge, etc.

Liveload Sidewalk liveload / Pedestrian loading

LOADS ON BRIDGES

Span 0 to 25 feet in length = 85l lb/ft^2 = 4.07 kN/m^2

Span 26 to 100 feet in length = 60 lb/ft^2 = 2.87 kN/m^2

(Liveload factor) x (effective width of sidewalk) x (sides)

ex.:

4.07 kN/m^2 x 0.76 m x 2 = 6.19 kN/m


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LOADS ON BRIDGES

Liveload Truck Loading

H - Loading - consists of a two-axle truck

LOADS ON BRIDGES

Liveload Truck Loading

HS - Loading - consists of a tractor truck with semi-trailer

LOADS ON BRIDGES

Liveload

Truck Loading

HS 20 - 44

Where : H - kind of truck to be used

20 - gross weight in tons

44 - year where series of trucks were

developed

LOADS ON BRIDGES

Liveload

Lane Loading

LOADS ON BRIDGES

Liveload

Lane Loading

LOADS ON BRIDGES

Impact

Vibration

Longitudinal forces - 5 % of the liveload in all

lanes carrying traffic headed in the same direction

braking

acceleration

Centrifugal force - to be applied on structures oncurves

Curb loading


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LOADS ON BRIDGES

Railing Loading

Wind Loads - moving uniformly distributed loads

applied to the exposed area of the structure.

Temperature - induced Forces - stresses or

movements resulting from variations in

temperature.

Forces from Stream Current and Debris

Earth Pressure

LOADS ON BRIDGES

Seismic Loads ex. CQC - Complete Quadratic Combination

scale - acceleration x gravity

acc = 0.40 - before liquefaction

acc = 0.20 - during liquefaction

damping ratio - percentage of reducing the energy absorbed by

the material

0.01 2.50; 0.42 2.50; 0.46 2.42; 0.50 2.29; 0.70 1.83; 0.78 1.70; 0.86 1.59;

1.02 1.42; 1.50 1.10; 2.00 0.91; 2.50 0.78; 3.00 0.69

From: DIVISION 1-A AASHTO GRAPH (RESPONSE SPECTRUM)

LOADS ON BRIDGES

Miscellaneous Loads

construction

handling

erection deformation

etc.

ANALYSIS RESULTS

Maximum Positive Moment

results to be use to design the bottom bars

Maximum Negative Moment

results to be use to design the top bars

Maximum Shear

results to be use to design the stirrups

Documents

Bridge Presentation Nha