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Testing and Modeling of Reinforced Concrete Coupling Beams
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Experiment-5: Test of Diagonally Reinforced Coupling Beam at Aspect Ratio 2.4 with 1/2 of Full Confinement and PT Slab (CB24F-1/2-PT)
Experiment Type: Large Scale
Description: This experiment consists of cyclic testing of a diagaonlly reinforced concrete coupling beam with confinement around the entire cross section. This confinement represents the new detailing option introduced in ACI 318-08. However, in this experiment, the amount of confinement steel is reduced to one-half of the required amount. This is accomplished by doubling the spacing of the transverse reinforcement along the length. The beam has aspect ratio (ln/h) 2.4 to represent typical residential construction. The specimen also has a post-tensioned concrete floor slab. The specimen is designated as CB24F--1/2-PT or Beam 5. The main objective of this experiment is to determine whether a reduction in the confinement reinforcement will dramatically affect the ductility. Because ACI does not consider anything but the diagonal reinforcement in determining strength, the purpose of the experiment is to assess the impact of the floor slab on coupling beam strength and ductility. Also, the increased axial load provided by the strands works to restrain the axial elongation of the beam (consistent with conditions in a building). Experimental results show that for coupling beam rotations less than 3%, the effect of reducing the confinement is not dramatic. At higher rotations, strength degrades and concrete does not maintain its integrity. Similar to experiment 3 and 4, the floor slab provides increased ductility and increased strength consistent with that expected due to the applied axial load, larger concrete area, and slab reinforcement.
Dates: February 14, 2008 - February 15, 2008
Facility: University of California, Los Angeles, CA, United States
Equipment: View Details
Specimen Type: Beam and End Blocks
Material: Material Results Material Results (view)
Sensors: Displacement Sensors
Force Sensors
Strain Gauges
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Tags (keywords):
  1. RC
  2. Coupling beam
  3. test
  4. model
  5. slab
  6. cyclic loading
  7. tall buildings
  8. core wall