BridgesBridges

Engineering DesignMrs. Hodgson

MaterialsMaterials

SteelSteel BeamsBeams CablesCables ConnectionsConnections

ConcreteConcrete RoadwayRoadway BeamsBeams

StoneStone WoodWood

What do bridges Carry?What do bridges Carry?

Cars, Trucks, Motorcycles, etc…Cars, Trucks, Motorcycles, etc… TrainsTrains PeoplePeople Pipes – gas, water, electric wires, etc…Pipes – gas, water, electric wires, etc… Extreme Loads - earthquakes/wind/impactsExtreme Loads - earthquakes/wind/impacts

All of these are “Live Loads”All of these are “Live Loads”

Self-weight is “Dead Load”Self-weight is “Dead Load”

Types of BridgesTypes of Bridges

GirderGirder Simple spansSimple spans Continuous spansContinuous spans

Girder BridgeGirder Bridge

Simple Span Simple Span

Continuous Spans

Girder BridgeGirder Bridge

How many spans do you see?

Types of BridgesTypes of Bridges

GirderGirder Simple spansSimple spans Continuous spansContinuous spans

TrussTruss Through trussThrough truss Pony trussPony truss Deck trussDeck truss

What is a Truss?What is a Truss?

Truss Types: BridgesTruss Types: Bridges

Through Through TrussTruss

Pony Pony TrussTruss

Deck Deck TrussTruss

Bridge Truss TypesBridge Truss Types

Truss BridgesTruss Bridges

Top ChordTop Chord

Bottom ChordBottom ChordD

iagonal

Dia

gonal

Vert

ical

Vert

ical

Truss BridgesTruss Bridges

TrussesTrusses

Truss BridgesTruss Bridges

Victory Bridge

Truss BridgesTruss Bridges

SR33 BridgeNorthampton County, PA

Types of BridgesTypes of Bridges

GirderGirder Simple spansSimple spans Continuous spansContinuous spans

TrussTruss Through trussThrough truss Pony trussPony truss Deck trussDeck truss

ArchArch Tied archTied arch Fixed archFixed arch

Fixed ArchFixed Arch

Tied ArchTied Arch

Arch BridgesArch Bridges

Cold Spring Arch BridgeSanta Barbara, CA

Fixed arch

Arch BridgesArch BridgesBirmingham Bridge Pittsburgh, PA

Tied Arch

Fort Duquesne BridgePittsburgh, PA

Tied Arch

Types of BridgesTypes of Bridges

GirderGirder Simple spansSimple spans Continuous spansContinuous spans

TrussTruss Through trussThrough truss Pony trussPony truss Deck trussDeck truss

ArchArch Tied archTied arch Deck archDeck arch

Cable-stayedCable-stayed

Cable-stayed BridgesCable-stayed Bridges

Cable-stayed BridgesCable-stayed BridgesSunshine SkywayTampa Bay, FL

Millau ViaductFrance

Types of BridgesTypes of Bridges

GirderGirder Simple spansSimple spans Continuous spansContinuous spans

TrussTruss Through trussThrough truss Pony trussPony truss Deck trussDeck truss

ArchArch Tied archTied arch Deck archDeck arch

Cable-stayedCable-stayed

SuspensionSuspension

Suspension BridgesSuspension BridgesBay BridgeSan Francisco, CA

Manhattan BridgeNew York, NY

Suspension BridgesSuspension Bridges

Golden Gate BridgeSan Francisco, CA

Bronx-Whitestone BridgeNew York, NY

Suspension BridgesSuspension Bridges

Verrazano Narrows BridgeNew York, NY

Brooklyn BridgeNew York, NY

Mixed Bridge TypesMixed Bridge Types

Brooklyn BridgeBrooklyn Bridge

FoundationsFoundations

Questions?Questions?