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SUMMARY:Damage detection in bridges by means of structural monitoring: pro
 blems and possibilities - Andrea Benedetti\, University of Bologna
DTSTART:20200306T150000Z
DTEND:20200306T160000Z
UID:TALK140569@talks.cam.ac.uk
CONTACT:Dr Maria Marques de Carvalho
DESCRIPTION:The early detection of critical states in bridge structures is
  a problem of paramount importance for the safety of the road users. Furth
 ermore\, the capability of grading the health state of infrastructures can
  drive a more effective maintenance planning with cost savings. Starting f
 rom the early aerospace and mechanical applications\, a huge literature de
 aling with bridge structures has been set out\, including some full-scale 
 testing of decommissioned bridges such as the one of Z24 bridge in Switzer
 land. However\, the signal modifications due to damages are very small\, t
 he detection errors can be large\, and dynamic nonlinearities play a very 
 important role when cracking in prestressed or reinforced concrete structu
 res is the focus. Finally\, the fatigue of corroded elements is far to be 
 fully understood.\nInside the SHAPE project of the ERA-NET Infravation 201
 4 call\, the research group decided to build two specimen bridges in scale
  1:4 (6x3 m2) in order to assess experimentally the dynamic changes due to
  imposed subsequent loading levels producing damage in the structures. Alt
 hough realistic models have a consistent cost and require huge testing fac
 ilities\, the use of scaled-down experimental bridges could be helpful in 
 comparing different detection tools and techniques.\nIn the presentation t
 he dramatic condition of the Italian bridges is firstly shortly reviewed\,
  presenting even some snapshots of the recent Polcevera bridge collapse. T
 hen\, some techniques able to detect damage states in structural elements 
 are listed and discussed. With reference to reinforced concrete structures
 \, the problem of dynamic identification of cracked beams is examined in d
 etail. Finally\, the results of the experimental investigation on the spec
 imen bridges are presented with the aim to point out the connection betwee
 n the dynamic properties of the models and the damage states examined.\n\n
LOCATION:Conference Room\, Civil Engineering Building\, JJ Thomson Avenue 
 7a.
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