1 / 25

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.

gema
Download Presentation

Tests of High-Performance Fiber-Reinforced Concrete Coupling Beams

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related