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Tests of High-Performance Fiber-Reinforced Concrete Coupling Beams

Tests of High-Performance Fiber-Reinforced Concrete Coupling Beams. James K. Wight F.E. Richart, Jr. Collegiate Professor Dept. of Civil and Env . Eng. University of Michigan Co-Researchers: Gustavo Parra-Montesinos and Remy Lequesne, Afsin Canbolat and Monthian Setkit. Key Thought.

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Tests of High-Performance Fiber-Reinforced Concrete Coupling Beams

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  1. Tests of High-Performance Fiber-Reinforced Concrete Coupling Beams James K. Wight F.E. Richart, Jr. Collegiate Professor Dept. of Civil and Env. Eng. University of Michigan Co-Researchers: Gustavo Parra-Montesinos and Remy Lequesne, AfsinCanbolat and Monthian Setkit

  2. Key Thought • Change from better rebar details to enhanced material properties

  3. Mt. McKinley Bldg., Anchorage, Alaska - 1964

  4. Diagonal Reinforcement, L/d ≈ 1 100% of flexural and shear strength

  5. Construction Issues, L/d ≈ 2 Low angle and reinforcement congestion

  6. Research Objectives • Use HPFRC to reducetransverse and diagonal reinforcement requirements in coupling beams • Develop information on shear strength and damage tolerance of HPFRC members subjected to large displacement reversals • Investigate the use of precast HPFRC coupling beams in earthquake-resistant coupled wall systems

  7. Test Specimens 4 D13 3 D16 SP-1 SP-2

  8. Test Setup Actuator Wall Block “Rigid” Links Precast Coupling Beam Wall Block

  9. Test Specimens 4 D13 3 D16 SP-1 SP-2

  10. Test Specimens 2 D16 2 D16 2 D16 SP-3 SP-4

  11. Construction issues: Beam embedment

  12. CB-2 design (L/d = 1.75)

  13. Precast Coupling Beam Extra mid-depth reinforcement used to move flexural hinging away from cold joint

  14. CB-2 behavior

  15. CB-2 During Testing 3% Drift 5.5% Drift

  16. Four story coupled-wall specimen • 25% scale • axial load in lower stories • slabs for load transfer at 2nd and 4th levels

  17. Reinforcement Detail, RC Wall • Confinement spacing: • Design wall concrete shear stress

  18. Reinforcement details, RC Wall

  19. RC Wall Behavior; ~ 42% coupling ratio

  20. Reinforcement Detail, FRC Wall • Confinement spacing: • Design wall concrete shear stress

  21. Comparison of Wall Behavior

  22. Damage Tolerance HPFRC coupling beams are significantly more damage tolerant than reinforced concrete beams R/C R/C • At system drift of 1.5%: • HPFRC: 1 mm cracks • RC: Spalling of cover to expose many stirrups HPFRC HPFRC

  23. HPFRC Wall Damage

  24. Conclusions – stout coupling beams • Adequate confinement of diagonal reinforcement is achieved by HPFRC without the need for bar-type confinement reinforcement • Contribution of HPFRC to shear capacity of coupling beams is significant and must be considered in design • Precast coupling beam placement proved to be simple and is believed to be a viable alternative method for assembling a coupled-wall system

  25. http://nees.org/warehouse/project/47 Innovative Applications of Damage Tolerant Fiber-Reinforced Cementitious Materials for New Earthquake-Resistant Structural Systems and Retrofit of Existing Structures

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