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1 California Department of Transportation Caltrans Precast Concrete Committee Update Jim Ma, P.E. Prestressed Concrete Specialist, Caltrans Nov. 3 rd, Caltrans/PCMAC/Consultants Bridge Workshop
2 California Department of Transportation Current Committee Members Fit Fritz Hoffman, SD Douglas Dunrud, SD Phil Lutz, SD Manode Kodsuntie, SD Eric Fredrickson, OSFP Say-Gunn Low, OSFP Jeremy S Wright, OSFP Keith Hoffman, METS Tom Ruckman, Specifications Cheryl Poulin, Construction Jim Ma, ESPD (Engineering Services Policy Development) Sue Hida, ESPD (Engineering g Services Policy Development)
3 PC Committee Mission and Goal Mission To Provide PRECAST (Policy, Resource, Expertise, Coordination, Assistance, Standards, Training) Goal Provide Technical lsupport tto Design and Construction for Precast Bridge Structures in CA Promote ABC by Using Precast Products Promote Prefabricated Bridge Elements and Systems (PBES) to Support FHWA EDC Initiative
4 Typical Cast-in-Place Falsework
5 California Precast Bridge Design Challenges Current Bridge Data: CIP 70% +, Precast 25% - WHY??? Precast Advantages: Rapid construction Minimize falsework Reduce traffic disruptions on-site Improve safety for traffic and construction workers Minimize environmental impact Increase product quality Precast Challenges: Si Seismic i Design Construction Cost Longer Span
6 Precast Bridge Seismic Design CONNECTION, CONNECTION, CONNECTION
7 California Precast Girder Bridge with ihdifferent Connections Typical California Precast Girder/Bent Cap Connections: Drop Bent Cap Connection Inverted-T Bent Cap Connection Integral Drop Bent Cap Connection Integral Bent Cap Connection
8 Precast Girder Connection Design and Details Drop Bent Cap Connection Continuous superstructure Pinned between superstructure and cap Column/footing connection has to be fixed Extend PC girder bottom strands Good seismic connection
9 Precast Girder Connection Design and Details Inverted-T Bent Cap Connection Semi-continuous superstructure Considered as pinned between superstructure and cap Column/footing connection has to be fixed Seismic i research study on-going
10 Precast Girder Connection Design and Details Integral Drop Bent Cap Connection Continuous superstructure Fixed between superstructure and cap Column/footing connection could be pinned Good seismic connection
11 Precast Girder Connection Design and Details Integral Bent Cap Connection Integral Bent Cap Connection Continuous superstructure Fixed between superstructure and cap Column/footing connection could be pinned Great seismic connection
12 Current Precast Bridge Cost
13 Current California Bridge Cost
14 Current PC Committee Working Items LRFD Precast Guidance Materials for Designers: 1. 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 4. Caltrans Standard Drawings: Precast Prestressed I-Girder Precast Prestressed Bulb-Tee Girder (Harped Strands 2 sheets, Debonded Strands 2 sheets) Precast Prestressed Voided Slab Precast Prestressed Wide-Flanged dgirder (under-development) d Precast Deck Panel (under-development)
15 California Department of Transportation California Precast Girder Inventory and Span Capacity
16 California Precast-Pretensioned Girders Precast Girder Shapes Common Used Shapes California I-Girders California Bulb-Tee California Bath-Tub California Voided Slabs Precast Box Beams Precast tdelta Girders CA WF Girder
17 California Precast-Pretensioned Girders Common Shapes and Span Length Summary
18 California Department of Transportation California i Wide-Flange Girder
19 California Precast Girder Bridge Span Capacity Typical Precast Girder: Post-Tensioned Spliced Precast Girder: Segmental Precast Girder:
20 Two Methods for Post-Tensioned Spliced Precast Girders Method 1: Splicing Girders Supported on Limited Falsework
21 Two Methods for Post-Tensioned Spliced Precast Girders Method 2: Splicing Girders on the Ground (Without Falsework)
22 PT Spliced Precast Girder Advantages Very limited falsework or no falsework Longer spans Maximize vertical clearance Rapid construction Continuous superstructure with no joints Integral system between superstructure, bent cap and columns Seismic resistance connection Could be pinned at column bottom Smaller footing size Aesthetic pleasant Low construction cost
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MINNESOTA DEPARTMENT OF TRANSPORTATION DEVELOPED BY: Design Standards ISSUED BY: Office of Program Management & Technical Support, Design Support Section TRANSMITTAL LETTER NO. (12-04) MANUAL: Standard
Standard Plate 7036 is discontinued. It is replaced by Standard Plan Pedestrian Curb Ramp Details.
DEVELOPED BY: Design Standards ISSUED BY: Office of Program Management & Technical Support, Design Support Section TRANSMITTAL LETTER NO. (12-02) MANUAL: Standard Plates DATED: May 11, 2012 SUBJECT: Standard
shawprecastsolutions.com BEBO Arch Systems PRODUCT GUIDE & TECHNICAL REFERENCE MANUAL Providing the right solutions.
shawprecastsolutions.com BEBO Arch Systems PRODUCT GUIDE & TECHNICAL REFERENCE MANUAL Providing the right solutions. BEBO ARCH SYSTEMS BEBO ARCH units are high quality, low maintenance precast structures
12. Pillar rebar arrangement
12. Pillar rebar arrangement 1) Indication of pillar(c) Main bar drawing - It indicates the length of span by the criterion of pillar and wall, etc. and indicates the position of pillar & wall.