caltrans connection design

22
California Department of Transportation Caltrans Precast Concrete Committee Caltrans Precast Concrete Committee Caltrans Precast Concrete Committee Caltrans Precast Concrete Committee Update Update Jim Ma, P.E. Prestressed Concrete Specialist Caltrans Prestressed Concrete Specialist, Caltrans Nov. 3 rd , 2010 2010 Caltrans/PCMAC/Consultants Bridge Workshop

Upload: ananta-gaikwad

Post on 17-Oct-2014

201 views

Category:

Documents


1 download

TRANSCRIPT

Page 1: Caltrans Connection Design

California Department of Transportation

Caltrans Precast Concrete CommitteeCaltrans Precast Concrete CommitteeCaltrans Precast Concrete Committee Caltrans Precast Concrete Committee UpdateUpdate

Jim Ma, P.E.Prestressed Concrete Specialist CaltransPrestressed Concrete Specialist, Caltrans

Nov. 3rd, 2010

2010 Caltrans/PCMAC/Consultants Bridge Workshop

Page 2: Caltrans Connection Design

California Department of Transportation

Current Committee Members

F it H ff SDFritz Hoffman, SDDouglas Dunrud, SDPhil Lutz, SDManode Kodsuntie, SDEric Fredrickson, OSFPSay-Gunn Low, OSFPJeremy S Wright, OSFPKeith Hoffman, METSTom Ruckman, SpecificationsCheryl Poulin, ConstructionJim Ma, ESPD (Engineering Services Policy Development)Sue Hida, ESPD (Engineering Services Policy Development)( g g y p )

Page 3: Caltrans Connection Design

PC Committee Mission and GoalPC Committee Mission and Goal

T P id PRECAST (P li R E ti

MissionMissionTo Provide PRECAST (Policy, Resource, Expertise, Coordination, Assistance, Standards, Training)

P id T h i l S t t D i d

GoalGoal

Provide Technical Support to Design and Construction for Precast Bridge Structures in CAPromote ABC by Using Precast ProductsPromote ABC by Using Precast ProductsPromote Prefabricated Bridge Elements and Systems (PBES) to Support FHWA “EDC” Initiativey ( ) pp

Page 4: Caltrans Connection Design

Typical Cast-in-Place Falsework

Page 5: Caltrans Connection Design

California Precast Bridge Design ChallengesCalifornia Precast Bridge Design Challenges

Current Bridge Data: CIP 70% +, Precast 25% Current Bridge Data: CIP 70% +, Precast 25% --

WHY ???WHY ???

Precast Advantages:R id i

Precast Challenges:S i i iRapid construction

Minimize falseworkReduce traffic disruptions on-site

Seismic DesignConstruction CostLonger Spanp

Improve safety for traffic and construction workersMinimize environmental impact

Longer Span

Minimize environmental impactIncrease product quality

Page 6: Caltrans Connection Design

CONNECTION CONNECTION CONNECTION

Precast Bridge Seismic Design Precast Bridge Seismic Design CONNECTION, CONNECTION, CONNECTION

Page 7: Caltrans Connection Design

California Precast Girder Bridge i h Diff C iwith Different Connections

Typical California Precast Girder/Bent Cap Connections:

Drop Bent Cap ConnectionInverted-T Bent Cap ConnectionIntegral Drop Bent Cap Connectiong p pIntegral Bent Cap Connection

Page 8: Caltrans Connection Design

Precast Girder Connection Design and DetailsDrop Bent Cap Connectionp p

Continuous superstructurePinned between superstructure and capand capColumn/footing connection has to be fixedE t d PC i d b tt t dExtend PC girder bottom strandsGood seismic connection

Page 9: Caltrans Connection Design

Precast Girder Connection Design and DetailsInverted-T Bent Cap Connectionp

Semi-continuous superstructureConsidered as pinned between superstructure and capsuperstructure and capColumn/footing connection has to be fixedS i i h t d iSeismic research study on-going

Page 10: Caltrans Connection Design

Precast Girder Connection Design and DetailsIntegral Drop Bent Cap ConnectionIntegral Drop Bent Cap Connection

Continuous superstructureFixed between superstructure and pcapColumn/footing connection could be pinnedGood seismic connection

Page 11: Caltrans Connection Design

Precast Girder Connection Design and DetailsIntegral Bent Cap ConnectionIntegral Bent Cap Connection

Continuous superstructureFixed between superstructure and capColumn/footing connection could be pinnedGreat seismic connection

Page 12: Caltrans Connection Design

Current Precast Bridge Cost

Page 13: Caltrans Connection Design

Current California Bridge Cost

Page 14: Caltrans Connection Design

Current PC Committee Working Items

LRFD Precast Guidance Materials for Designers:

1 Bridge Design Aids Chapter 6 (New Wide Flange Girder Box1. Bridge Design Aids Chapter 6 (New Wide-Flange Girder, Box Section, Trapezoidal Section, Voided Slab Table)

2. Bridge Memo to Designers: 11-8 “Design of Precast Prestressed Girders”

3. Bridge Design Practice Manual: Chapter 10 “PC/PS Concrete Girder Design Example”g p

4. Caltrans Standard Drawings:Precast Prestressed I-GirderPrecast Prestressed Bulb Tee Girder (Harped Strands 2 sheetsPrecast Prestressed Bulb-Tee Girder (Harped Strands 2 sheets, Debonded Strands 2 sheets) Precast Prestressed Voided Slab

d id l d Gi d ( d d l )Precast Prestressed Wide-Flanged Girder (under-development)Precast Deck Panel (under-development)

Page 15: Caltrans Connection Design

California Department of Transportation

California Precast Girder Inventory and Span Capacity

Page 16: Caltrans Connection Design

California Precast-Pretensioned GirdersPrecast Girder Shapes

Common Used ShapesCalifornia I GirdersCalifornia I-GirdersCalifornia Bulb-TeeCalifornia Bath-TubCalifornia Voided SlabsPrecast Box BeamsP t D lt Gi dPrecast Delta GirdersCA WF Girder

Page 17: Caltrans Connection Design

California Precast-Pretensioned GirdersCommon Shapes and Span Length SummaryCommon Shapes and Span Length Summary

Page 18: Caltrans Connection Design

California Department of Transportation

C lif i Wid Fl Gi dCalifornia Wide-Flange Girder

Page 19: Caltrans Connection Design

California Precast Girder Bridge Span CapacityCalifornia Precast Girder Bridge Span Capacityg p p yg p p y

Typical Precast Girder: 30’-180’Post-Tensioned Spliced Precast Girder: 100’-300’Segmental Precast Girder: 200’-450’g

Page 20: Caltrans Connection Design

Two Methods for Post-Tensioned Spliced Precast GirdersMethod 1: Splicing Girders Supported on Limited FalseworkMethod 1: Splicing Girders Supported on Limited Falsework

Page 21: Caltrans Connection Design

Two Methods for Post-Tensioned Spliced Precast GirdersMethod 2: Splicing Girders on the Ground (Without Falsework)Method 2: Splicing Girders on the Ground (Without Falsework)

Page 22: Caltrans Connection Design

PT Spliced Precast Girder Advantages

Very limited falsework or no falseworkLonger spansLonger spansMaximize vertical clearance

Rapid constructionpContinuous superstructure with no jointsIntegral system between superstructure, bentcap and columnsSeismic resistance connectionCould be pinned at column bottomCould be pinned at column bottomSmaller footing sizeAesthetic pleasantAesthetic pleasantLow construction cost