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SUMMARY:Field Performance\, Centrifuge Modelling and Numerical Analysis of
  Induced Trench Rigid Culverts - Professor Arun Valsangkar\, Dept of Civil
  Engineering\, University of Brunswick\, Canada
DTSTART:20071102T163000Z
DTEND:20071102T173000Z
UID:TALK8329@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:In many instances\, a compressible layer is placed above rigid
  culverts when installed under embankments with heights in excess of 12 m.
  These types of installations are classified as induced trench culverts an
 d the designs are based on Marston-Spangler Theory. Even though this appro
 ach has been used since about 1930\, serious concerns about the assumption
 s made in the theory\, and some recent serviceability related problems hav
 e led to the deletion of this approach from the American Concrete Pipe Ass
 ociation Handbook. As this method of construction has been successfully us
 ed in the Province of New Brunswick\, a research program was undertaken to
  understand the complex soil structure interactions in such installations.
   Two prototype structures were instrumented and monitored and the field d
 ata were compared with the Marston-Spangler design approach and results of
  numerical analysis. A program of centrifuge modelling was undertaken to s
 tudy the effect of various parameters such as the thickness\, width and th
 e location of compressible layer on the load transfer. The results of cent
 rifuge modelling were supplemented with numerical analysis to obtain compl
 ete pressure distribution on rigid culverts. It is concluded that Marston-
 Spangler method does not capture the true load transfer behaviour and revi
 sed pressure distributions should be used for such installations.\n\n
LOCATION:Engineering Department - LR6
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