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Deck Tied Arch True Arch Cable-Stayed

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Deck Tied Arch True Arch Cable-Stayed BridgeBridge TypeType AlternativesAlternativesBridge Type Alternatives RecommendedRecommended toto StudyStudyRecommended to Study Vertical Arch Vertical CablesVertical Arch Arch Cables CablesVertical Arch Cables Bridge Deck Bridge Deck Deck Tied Arch This bridge type spans the navigation opening usingDeck anTied arch Arch that supports the roadway deck by using vertical Thiscables. bridge The type entire spans arch theis self-equilibrating, navigation opening meaning using anthe arch entire that span supports may be the lifted roadway into place deck asby ausing unit duringvertical cables.construction. The entire arch This is bridge self-equilibrating, type is quite meaning economica thel forentire the spanspan maylength be needed lifted into for place this crossing. as a unit during construction.Bridge This bridge type isType quite economica lAlternatives for the span length needed for this crossing. DECK TIED ARCH Advantages Bridge Type AlternativesDisadvantages •Advantages Economical for this span length •Disadvantages Difficult to inspect underneath structure •• Minimal Economical structureRecommended for this depth span maintains length roadway profile •• Deck Difficultto replacement toStudy inspect underneathmay be challenging structure if •• Can Minimal be built structureRecommended off-site depth and movedmaintains into roadway place profile • bridge Deckto replacement deck Study is tied tomay structure be challenging if • Can be built off-site and moved into place •Vertical Construction with minimal navigation interference bridge deck is tied to structure • Construction with minimal navigation interference Arch VerticalCables Arch Arch Cables Vertical Arch US 150 McClugage Bridge Project US 150 McClugageVerticalCables Bridge Project Cables Bridge Deck Foundation Bridge Deck TRUE ARCH TRUE Foundation True Arch Similar to the Deck Tied Arch except the foundation Truesupp ortsArch the arch that supports the roadway deck. This design Similaradds considerablyto the Deck Tied to the Arch size except of the the foundations. foundation A supptemporaryorts the tie arch can that be constructed supports the for roadway this bridge deck. allowing This design it to adds considerablybe lifted into to theplace size during of the construction. foundations. The A temporary cost is somewhat tie can be greater constructed than the for Deck this bridge Tied Arch. allowing it to be lifted into place during construction. The cost is somewhat greater than the Deck Tied Arch. Advantages Bridge Type AlternativesDisadvantages Advantages• Minimal structureBridge depth maintains Typeroadway profile AlternativesDisadvantages• Design of foundation support is more • MinimalEase of structuredeck replacement depth maintains roadway profile • Designcomplex of than foundation other bridge support types is more • EaseCan be of builtdeck off-siteRecommended replacement and moved into place • tocomplex Arch constructionStudy than other and bridge connection types to the • CanConstruction be built off-siteRecommended with minima and movedl navigation into place interference • to Archfoundation constructionStudy is challenging and connection to the • Construction with minimal navigation interference foundation is challenging Cable Tower Cable Tower Cable US 150 McClugage Bridge Project Cable Tower Tower US 150 McClugage Bridge Project Bridge Deck Bridge Deck Cable-Stayed CABLE-STAYED This bridge type is generally used for longer spansCable-Stayed than can be achieved with either arches or girders. An exampleThis bridge would type be theis generally Golden Gate used Bridge for longer in San spans Franc thanisco, can California. be achieved The with roadway either deck arches is supported or girders. by An high example wouldstrength be thecables Golden that Gateoriginate Bridge from in towers.San Franc Theisco, cost California. is high compared The roadway to other deck bridge is supported types. by high strength cables that originate from towers. The cost is high compared to other bridge types. Advantages Disadvantages Advantages• Minimal structure depth maintains roadway profile Disadvantages• Highest cost • Highest cost •• Minimal Construction structure without depth navigation maintains interference roadway profile • Inspection more difficult than other bridge types • Inspection more difficult than other bridge types •• Construction Ease of deck without replacement navigation interference • Design of tower and cables is more difficult than • Ease of deck replacement • Designother bridge of tower types and cables is more difficult than •other Most difficultbridge types bridge type to construct • Most difficult bridge type to construct US 150 McClugage Bridge Project US 150 McClugage Bridge Project Bridge Type Alternatives BridgeBridge Type Type Alternatives Alternatives Recommended to Study RecommendedRecommended to to Study Study Cable Cable Tower Tower Cable Cable Tower Cable Cable Tower Tower Tower Box Box Girder Box Girder Girder Bridge Deck EXTRADOS Bridge Deck Bridge Deck Extrados This bridgeExtrados type is a hybrid between a box girder bridge and a cable-stayed bridge. The towers are approximately Extrados This bridge type is a hybrid between a box girderhalf bridgeas tall asand for a acable-stayed cable-stayed bridge. bridge. The This towers form areallows approximately longer spans for more slender box girders, and can be This bridge type is a hybrid between a box girder bridge and a cable-stayed bridge. The towers are approximately half as tall as for a cable-stayed bridge. Thismore form economical allows longer for spansspans forin the more range slender of the box McClugage girders, andbridge can thanbe a pure box girder bridge. This option would half as tall as for a cable-stayed bridge. This form allows longer spans for more slender box girders, and can be more economical for spans in the range of the McClugage bridge than a purepotentially box girder raise bri thedge. roadwa Thisy option more thanwould the arch options. more economical for spans in the range of the McClugage bridge than a pure box girder bridge. This option would Bridgepotentially raise Type the roadway moreAlternatives than the arch options. Bridgepotentially raise Typethe roadwaAdvantagesy more Alternatives than the arch options. Disadvantages Disadvantages • Structure depth would raise roadway Advantages • ConstructionDisadvantages without navigation interference Advantages • Structure depth would raise roadway • Design of tower and cables is more difficult • Construction without navigation interference• Ease of• deck Structure replacement depth would raise roadway • ConstructionRecommended without navigation interference • Design to of towerStudy and cables is more difficult than other bridge types • Ease of deck replacement • Design of tower and cables is more difficult • Ease of deckRecommended replacement than to other bridgeStudy types • Construction more difficult than other bridge than other bridge types • Construction more difficult than other bridge types • Construction more difficult than other bridge types types US 150 McClugage Bridge Project US 150 McClugage Bridge Project US 150 McClugage Bridge Project Through Truss This is the type of bridge currently in service for Throughboth McClugage Truss Bridge structures. This bridge form was quite commonThis is thebefore type the of 1960sbridge duecurrently to the in effici serviceent use for bothof steel. McClugage Both single-s Bridgepan structures. and three-span This bridge trusses form are was an quiteoption commonfor this beforebridge thetype. 1960s Construction due to the and effici maintenanceent use of steel. of this Both bridge single-s type paninvolves and three-spanmore cost than trusses for competingare an option for this bridge type. Constructionbridge forms, and so maintenancethe through tru ofss this is bridgerarely seentype involves new projects. more cost than for competing THROUGH TRUSS THROUGH Advantages bridge forms, so the through truss is rarely seenDisadvantages in new projects. •Advantages Matches existing bridge •Disadvantages High cost •• Minimal Matches structure existing bridgedepth maintains roadway profile •• Most High complexcost bridge type to design ••Preliminary Construction Minimal structure with minimadepth maintainsl navigation roadway interference Bridge profile •• Most MostType difficultcomplex bridge bridge type type to to inspect design • ConstructionPreliminary with minimal navigation interference Bridge•• Deck MostType difficultreplacement bridge difficult type to inspect • Deck replacement difficult US 150 McClugage Bridge Project AlternativesAlternativesPreliminary Bridge NotTypeNot Alternatives CarriedCarried Not Carried ForwardForward ForwardUS 150 McClugage Bridge Project 15’-25’ 50’-60’ 15’-25’ 50’-60’ Dual Deck Concrete Segmental Box Girder Steel Box Girder Dual Deck Concrete Segmental Box Girder Steel Box Girder 20’-30’ 20’-30’ 15’-25’ 15’-25’ 66.4’ 66.4’ Haunched Plate Girder Deck Truss Haunched Plate Girder Deck Truss These bridge types were eliminated due to structure depth, impacts to the interchanges and cost. The depth to Thesesupport bridge the bridge types deckwere requireseliminated the due roadway to structure elevation depth, to impactsincrease to to the maintain interchanges the river and channel cost. The depth navigationto support clear the heightbridge ofdeck 66.4’. requires the roadway elevation to increase to maintain the river channel navigation clear height of 66.4’. US 150 McClugage Bridge Project US 150 McClugage Bridge Project.
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