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SUMMARY:Simplification of Reinforcement Detailing in Coupled Wall Systems 
 Through the Use of High‐Perforrmance Fiber Reinforced Concrete -  Gustav
 o J. Parra‐Monntesinos 
DTSTART:20130308T150000Z
DTEND:20130308T160000Z
UID:TALK42855@talks.cam.ac.uk
CONTACT:Lorna Everett
DESCRIPTION:Reinforced Concrete coupled walls consist of two or more walls
  connected by short beams referred to as coupling beams.  The coupling act
 ion provided by these beams leads to increased lateral stiffness and stren
 gth compared to isolated walls. During a seismic event\, these coupling be
 ams also represent a source of energy dissipation through inelastic deform
 ations. In order to ensure adequate deformation capacity during earthquake
 s\, a combination of diagonal bars and heavy confinement reinforcement is 
 typically used in reinforced concrete coupling beams. This reinforcement s
 cheme\, although it has been proven effective to ensure adequate seismic b
 ehavior of coupling beams\, is costly and difficult to construct. \n\nAs a
 n alternative to the use of intricate diagonal and transverse reinforcemen
 t detailing in coupling beams\, the use of strain-hardening\, high-perform
 ance fiber reinforced concrete was investigated. The use of a ductile mate
 rial both in tension and compression diminishes the reliance on diagonal a
 nd transverse reinforcement for shear resistance and ductility\, substanti
 ally simplifying coupling beam construction. The proposed design was evalu
 ated through a series of tests on isolated coupling beams with length to t
 otal depth ratios ranging from 1.75 to 3.3. In addition\, two four-story c
 oupled walls incorporating precast fiber reinforced and regular reinforced
  concrete coupling beams were tested under lateral displacement reversals.
  Fiber reinforced concrete was also used at the base of one of the coupled
  wall specimens in order to reduce the amount of transverse reinforcement 
 in the boundary regions of the coupled walls. Test results indicate that s
 train-hardening\, high-performance fiber reinforced concrete contributes s
 ignificantly to both shear strength and deformation capacity of coupling b
 eams. A reduction of approximately 60% in the amount of diagonal reinforce
 ment was achieved in short coupling beams\, while a total elimination of d
 iagonal bars was found to be possible in slender coupling beams (i.e. aspe
 ct ratio of 3.3). Coupling beam drift capacities exceeded 5% under a shear
  stress in the order of 0.8-1.0√f’c (MPa). At the system level\, coupl
 ed walls with precast fiber reinforced concrete coupling beams exhibited a
  drift capacity greater than 3% with superior damage tolerance compared to
  regular concrete coupled walls.\n
LOCATION:Engineering Department - **LR5**
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