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SUMMARY:Punching shear and shear resistance of high performance fibre rein
 forced concrete
DTSTART:20101216T121500
DTSTAMP:20260429T184801Z
UID:3332d16f8440095892b62018c691fe87bcfdccb89fe8966127e9c037
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. René Suter\, University of applied sciences Fribourg\nM
 odern admixtures as well as the addition of steel fibres allow producing c
 oncretes with exceptional mechanical  rheological and durability character
 istics. These high performance fibre reinforced concretes (HPFRC) are perf
 ectly adapted to the design of new and innovative constructions. Currently
   in practice  the use of high performance concretes is still limited to i
 solated cases  despite the highly attractive characteristics of this mater
 ial. The principal reasons are a poor knowledge on the behaviour of struct
 ural HPFRC elements and the lack of adequate design rules.\nIn order to co
 ntribute to a better knowledge on the structural behaviour of these concre
 tes  theoretical and experimental studies were carried out at University o
 f applied sciences in Fribourg. This presentation will discuss the studies
  of shear behaviour of post-tensioned concrete beams and punching shear ca
 pacity of thin concrete slabs.\nFull scale tests were carried out on seven
  precast and post-tensioned TT beams and on eight rectangular beams in ord
 er to analyse the contribution of steel fibres on the shear capacity. Thes
 e tests showed that the addition of steel fibres increases the shear capac
 ity by 10 % to 40%. According to these results it will be possible to repl
 ace stirrups by an adequate percentage of fibres.\nLoad tests were also ca
 rried out on twenty HPFRC slabs according to three parameters: the quantit
 y of fibres  the reinforcement ratio and the post-tensioning level. These 
 tests highlighted the contribution of steel fibres on punching shear capac
 ity  which increases by 20% to 70 %. They also showed that the punching sh
 ear capacity is inversely proportional to the rotation of the slab. That m
 eans the more the reinforcement ratio or the post-tensioning level are imp
 ortant  the more the risk of a failure by punching shear becomes determina
 nt. The numerical analysis on the behaviour of the slabs is based on the f
 ailure criterion developed by Muttoni. Actually we are working on adapting
  this failure criterion for HPFRC slabs in order to establish directives f
 or dimensioning.
LOCATION:GC A3 31
STATUS:CONFIRMED
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