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SUMMARY:Understanding the mechanism of restraint in edge restrained reinfo
 rced concrete walls - Prof. John Forth\, School of Civil Engineering\, Lee
 ds University
DTSTART:20190607T140000Z
DTEND:20190607T150000Z
UID:TALK125899@talks.cam.ac.uk
CONTACT:Karen Mitchell
DESCRIPTION:Concrete is the most widely used material and is essential to 
 the global programme of infrastructure updating (global estimate ~$100Tn i
 ncluding UK National infrastructure plan £400Bn https://goo.gl/3doBZN). E
 xcessive cracking due to restraint is a widespread problem in the concrete
  construction industry leading to costly remedial measures and delays. For
  example\, a recent project in England was delayed due to excessive cracki
 ng. Subsequent changes to limit the edge restraint of early thermal and sh
 rinkage strain produced a real cost to the client of approximately £1.75M
 . There are many situations when cracking due to the restraint of imposed 
 deformations (i.e. early thermal movement and shrinkage) may be difficult 
 to avoid. In fact\, cracking from the restraint of early thermal movements
  (often referred to as ‘non-structural’ cracking) is the most common f
 orm of restraint induced cracking. In design\, cracking is managed by the 
 provision of reinforcement intended to distribute internal strains in such
  a way as to control the cracking pattern and limit crack widths. Current 
 UK design guidance on restraint induced cracking is encapsulated in EN1992
 -3:2006 and CIRIA report C660/766. The underlying design methodology in th
 ese documents has been used for over 30 years and is flawed. This is refle
 cted in field observations identifying cracking patterns contrary to – a
 nd crack widths in excess of – those predicted by EN1992-3:2006 (see Fig
  1). It is apparent that such ‘non-compliance’ cases result from erron
 eous basic assumptions\; in particular\; the boundary (restraint) conditio
 ns play a more significant role in determining the crack pattern.\n\nJohn 
 is the Chair of Concrete Engineering and Structures in the School of Civil
  Engineering at the University of Leeds and Director of the Neville Centre
  of Excellence in Cement and Concrete Engineering. He was awarded his firs
 t degree\, a BEng (Hons) in Civil and Structural Engineering from the Univ
 ersity of Sheffield. He received his PhD from the University of Leeds. He 
 has seven years industry experience in the field of Structural Engineering
  and still regularly acts as a consultant for industry. A Chartered member
  of The Institution of Structural Engineers\, he is on several technical c
 ommittees (i.e. Eurocodes\, fib\, RILEM) in the European Union. His resear
 ch interests include the serviceability performance of all types of reinfo
 rced concrete composites and the dynamic performance of reinforced concret
 e and masonry structures.
LOCATION: Cambridge University Engineering Department\, LT6
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