BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Increasing the acceptance of High Performance Concrete Prestressed
  with CFRP - Dr Giovanni Terrasi (EMPA)
DTSTART:20070525T140000Z
DTEND:20070525T150000Z
UID:TALK7089@talks.cam.ac.uk
CONTACT:Nami Norman
DESCRIPTION:This contribution describes selected architectural projects re
 alized by using thin-walled structural elements made of high performance c
 oncrete (HPC) prestressed by carbon fibre reinforced plastic (CFRP) and gi
 ves information about design and experimental validation work. A first ful
 l scale structural element made from HPC prestressed with pultruded CFRP t
 endons was produced\, tested and installed in the years 2000-2001 by the S
 wiss prefabrication element plant SACAC Schleuderbetonwerk AG in the form 
 of a thin-walled overhead power line pylon. This 27 metres high tubular py
 lon for the transmission of high voltages was produced by centrifugal cast
 ing technique with a concrete wall-thickness of merely 48 mm. It was there
 fore 40% lighter than a conventional steel-reinforced concrete pylon used 
 for the same purpose. The transport and erection costs were reduced which\
 , with an expected maintenance free service life of 50 years\, should resu
 lt in lower life-cycle costs than those of tubular steel or steel lattice 
 pylons which need a new coat of corrosion protection paint after approxima
 tely 20 years. In 2002\, this technology that was originally developed in 
 close collaboration with the Swiss Federal Laboratories for Materials Test
 ing and Research Empa\, was further optimized by SACAC to produce durable 
 and lightweight CFRP prestressed concrete lighting columns. A series of th
 e first type of column from this product line (with length 9.2 m) was subj
 ect to a very detailed experimental study with static\, dynamic and durabi
 lity tests at the University of Cambridge. Since then SACAC sold more than
  1’000 CFRP prestressed columns. In 2005-2006 this novel technique was i
 mplemented in the structural and architectural field with the realisation 
 of two greater building façades in Zurich Switzerland using totally 3’0
 00 m1 filigree CFRP prestressed self compacting concrete profiles. One key
  feature in order to increase the cost effectiveness of this technique is 
 the increase of the prestressing level of the CFRP tendons. Two approaches
  are followed in the frame of a current research project: The increase of 
 the anchorage performance of the clamping devices used for pretensioning t
 he HPC as well as the optimization of relevant material properties (transv
 erse compressive strength and interlaminar shear strength of the pultruded
  CFRP tendons). First results are summarized.
LOCATION:Engineering Department - LR6
END:VEVENT
END:VCALENDAR