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CATEGORIES:Engineering Department Structures Research Seminar
 s
SUMMARY:Prestressing in Coventry Cathedral - Dr Chris Burg
 oyne
DTSTART;TZID=Europe/London:20150130T150000
DTEND;TZID=Europe/London:20150130T160000
UID:TALK57372AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/57372
DESCRIPTION:Coventry Cathedral was completed in the early 1960
 s and has some prestressed elements to resist late
 ral thrust from the roof. Other prestressed struct
 ures of a similar age have had corrosion problems 
 and this has drawn attention to the fact that ther
 e is little publicly available information about t
 he structural system at Coventry.  This talk addre
 sses that issue and is in three sections.  The fir
 st summarises the four different prestressing syst
 ems in the cathedral and estimates the amount of p
 restress and its purpose in each location.  It sho
 ws that the design was based entirely on lower-bou
 nd principles using very simple analysis technique
 s.  Although there is no evidence of corrosion in 
 the building at the moment\, it is impossible to i
 nspect the existing tendons\, so the second sectio
 n considers what might happen to the structure if 
 corrosion of the tendons were to occur.  It is con
 cluded that very little warning of failure would b
 e given\, which would be especially important for 
 the tendons over the Baptistry window and those in
  the Nave ties.  The final section considers what 
 could be monitored to give as much warning as poss
 ible about future problems.  \nThe effects of loss
  of an individual tendon\, which would not by itse
 lf be sufficient to cause failure of the structure
 \, would cause only very small strains that would 
 be difficult to distinguish from the background st
 rains caused by the temperature changes.  Many of 
 the principles discussed in the second and third s
 ections would be applicable to most other prestres
 sed concrete structures.\n
LOCATION:Cambridge University Engineering Department\, LR5
CONTACT:Lorna Everett
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