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SUMMARY:Fracture Propagation and Fracture Energy in FRP Plate Debonding fr
 om RC Beams - Garfield X Guan - CUED
DTSTART:20120504T140000Z
DTEND:20120504T150000Z
UID:TALK37568@talks.cam.ac.uk
CONTACT:Lorna Everett
DESCRIPTION:Fibre-reinforced polymer (FRP) plates have been widely used to
  retrofit RC beams to achieve higher strength\, however\, it is not uncomm
 on to find the retrofitted RC beams fail in a sudden manner by premature d
 ebonding before the target flexural capacity. A layer of concrete is usual
 ly found attached to the debonded plate\, so plate debonding is clearly a 
 fracture event of concrete that is initiated from the inevitable flaws in 
 the concrete cover layer. In the retrofitted RC beams\, these small flaws 
 can trigger-off structure collapse\, so should be investigated in detail. 
 Although it has been studied for decades\, detailed concrete fracture inve
 stigation has been considered difficult so far. There is a lack of direct 
 fracture observation for the plate debonding failure that occurs in the co
 ncrete cover layer. \n\nUsing non-destructive image correlation techniques
 \, which obtain real strain field distributions from digital photographs\,
  it is possible to observed the detailed process and provide estimates for
  the fracture energy related to FRP plate debonding. This talk will presen
 t the experimental observations of a plate debonding fracture propagation 
 in a plated double-cantilever beam specimen\, which is designed to simulat
 e the concrete cover layer\, and a way of estimating the fracture energy a
 ssociated to FRP plate debonding.\n
LOCATION:Engineering Department - **LR5**
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