SteelBridgeExcellence:KeystoEffectiveConstruction

WesternBridgeEngineersSeminar24 27September2007

RonnieMedlockHighSteelStructures,Inc.

HighSteelStructures

1931 SanfordH.HighpurchasedKingWeldingCompany(LaternamedHighWeldingCompany)

HighSteelStructures

LargeststeelgirdermanufacturerintheU.S.

Fourfacilities ISO9001Certified 14Statemarketarea AISCcertified

Bridges Building Erection

Excellence

Durable Economical Ontime Aesthetic

Excellence

Durability

WeatheringSteelCostSavings

Costsavings Firstcost Inservicecost

WeatheringSteelPerformance DetailingisKey

CleaningandPainting

Economy

Opportunity to Influence Project Quality and Cost

100%

from: AISC MANUAL

Level ofInfluence

Decreasing Influence

0%Design Construction OperationPeriod Period Period

DesignEconomy

Standard Special

DesignEconomy

Standard Understooddetails,readilyavailablematerials,knownconnections,provenprocesses

Special Mysteriousdetails,hardtofindmaterials,difficult(orimpossible)connectionstofabricate,unprovenprocesses

AASHTO/NSBASteelBridgeCollaboration

Standardization Website:

www.steelbridges.org

Listserver

CollaborationStandardG12.1

Design GirderDesign Boxes Bolts CorrosionProtection

Other

Material

Economy= OptimalavailabilityConsiderleadtimes!

Minimalplatethicknessvariances

Useofbarstock Minimalshapevariances

FabricationCycleTime

ShopDrawingReview

Responsibility Expediency Approved/approvedasnoted

DesignIntentDrawingComparison

FabricationCost

48%

34%

7%

6% 5%

Fabrication Labor

Material (Plate)

Material (Detail)

Transportation

Painting

Economy=leastweight?

FabricationCost

48%

34%

7%

6% 5%

Fabrication Labor

Material (Plate)

Material (Detail)

Transportation

Painting

Economy=leastweight?

Welding

Whentochangearea? Shopspliceswithinashippingpiece

Nomorethan2shopslicesMinimumchange;1/8 (to2 thick),1/4Maximumchange;thinnerpieceatleast1/2ofthicker

ONLY whenmaterialcostsaved>laborcostspent

EconomicFlanges

Weight Saving Factor Per Inch of Plate Widthfor ASTM A709-Gr 50 Non-Fracture Critical Flanges Requiring Zone 1 CVN Testing

1304.0

1101103.5

90901103.0

80801001002.5

70709090902.0

808080801.5

7070701.0

4.03.53.02.52.01.51.0

ThickerPlateatSplice(inches)ThinnerPlateatSplice(inches)

Multiplyweightsavings/inchxflangewidth(lengthofbuttweld)

FlangeSizing whentochangearea?

EconomicFlanges

FlangeSizing howtochangearea? Shopspliceswithinashippingpiece whattochange,widthorthickness?Keepwidthconstant(i.e.,tochangecrosssectionarea,changethickness)

WHY?

8 Welds

Weld

FlangeSizing changewidth

Two welds

Burn

FlangeSizing changethickness

G1.2DetailingGuideFramingPlan&GirderElevation

G1.2 FramingDetails

Detailing

ConnectionStiffenerAttachment

Boxes

StiffenerDetailat(near)BottomFlangeofTubGirders

Assembly

PieceSize

Considerwhatcanbereadilyliftedandshipped

Shipping

Shipping ShippingProcedure(Elevation)

Shipping ShippingProcedure(Plan)

Shipping ShippingProcedure(Section)

Shipping/Fabrication Piece Limits

Mostcompetitive: Length

Erection

CollaborationStandard Qualifications Certifications Erectionplan

SkewedBridgeErection

CrossFrameConnections

preferred (by fabricators) 20o maximum skew

.

SkewedBridgeErection

CompleteDeadLoad

SteelDeadLoad

SkewedBridgeErection

Tightenboltsbeforepouringdeck

SkewedBridgeErection

Lean-On Bracing in Frames

Lean-On Bracing in Beams

Bracing Layout for Lubbock 9 Girder Bridge

X added to control differential deflectionX added for stability during girder erection

CollaborationStandards G1.1,ShopDetailDrawingReview/ApprovalGuidelines G1.2,DesignDrawingPresentationGuidelines G1.3,ShopDetailDrawingPresentationGuidelines G1.4,GuidelinesforDesignDetails S2.1,SteelBridgeFabricationGuideSpecification S4.1,SteelBridgeFabricationQC/QAGuideSpecification S8.1,GuideSpecificationforZincRichPrimerBased

CoatingSystems G9.1,SteelBridgeBearingDesignandDetailing

Guidelines G10.1,SteelBridgeErectionGuidelines(soontobepub.) G12.1, GuidelinesforDesignforConstructability

Summary

Durability Detailforinfinitelife

Economy Industryinput AASHTO/NSBASteelBridgeCollaborationStandards

CommunicationThankyou