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