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Design

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Design Using Ultra High Performance Concrete Dean Bierwagen April 12th, 2006 Why UHPC? High compressive strength (18.0 ksi) High durability Low permeability ... – PowerPoint PPT presentation

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Title: Design


1
Design Using Ultra High Performance Concrete
  • Dean Bierwagen
  • April 12th, 2006

2
Why UHPC?
  • High compressive strength (gt18.0 ksi)
  • High durability
  • Low permeability
  • Remove mild reinforcement
  • More efficient sections

3
Replacement Bridge
  • 110 ft single span
  • 3 beam cross section
  • Modified Iowa bulb-tee
  • Integral abutments
  • 8 inch cast-in-place deck

4
Replacement Bridge
5
Design Background
  • French Guide Specification
  • Design Guidelines for RPC Prestressed Concrete
    Beams, University of New South Wales
  • Research work by Dr Ulm, MIT
  • Discussion w/ Vic Perry of LaFarge, Chris Hill of
    Prestressed Services, Lextington, KT, Ben
    Graybeal of FHWA Turner Fairbanks Lab.
  • Research by FHWA Turner-Fairbanks

6
Design Work
  • Joint Design
  • Wapello County
  • Iowa State University
  • Iowa Department of Transportation
  • Design reviewed by Dr Ulm, MIT
  • CADD sheets by ISU coop students
  • Verified by flexure and shear test

7
Iowa Standard 45 in. Bulb-T
8
Preliminary Section
9
Final Modified Section
  • Reduced section
  • 1 inch top flange
  • 2 inch web
  • 2 inch bottom flange

10
Final Modified Section
11
UHPC Design Data
  • Release compressive strength 14.5 ksi
  • Release modulus of elasticity 5,800 ksi

12
UHPC Design Data
  • Final Compressive Strength 24.0 ksi
  • Expected 30.0 ksi
  • Final modulus of elasticity 8,000 ksi

13
Allowable Service Stresses
  • Allowable compressive release 8.7 ksi
  • Allowable compressive flange 14.4 ksi
  • Cracking tension 1.2 ksi
  • Allowable tension 0.6 ksi

14
Loading
  • AASHTO-LRFD HL93
  • Distribution Factor Grillage Analysis (ISU)
  • Simple beam supports

15
Shear Capacity
  • Service
  • Vu 189 kips
  • Vtest 315 kips
  • Ultimate
  • Vu 300 kips
  • Vtest 501 kips

16
Composite Connection
  • Concern w/ proper placement of plastic
  • Provide flat surface
  • 3 options test beam
  • ¼ inch roughness

17
Composite Connection
18
Anchorage
  • Transfer of prestressing force
  • Ohio University (lt 12 inches)
  • MIT analysis pi section
  • Debonded steps and draped strands
  • Release of strands

19
Summary of Beam
  • 49-0.6 inch diameter strands
  • 72.6 of ultimate
  • 5 draped
  • 16 debonded

20
Summary of Beam
21
Comments
  • Compressive strength
  • Durability
  • Quality
  • Release 14.5 ksi to final 24.0 ksi
  • Allowable tension
  • Cost

22
Comments
  • Develop experience
  • Designers
  • Materials Eng.
  • Precasters
  • Special testing
  • Start small

23
Additional Applications
  • PI section
  • Precast paving notch repair
  • Post-tensioned bridge
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