FATIGUE%20PERFORMANCE%20OF%20FRP%20AND%20RADIAL-PIN%20REINFORCEMENT%20ON%20MULTI-RING%20MASONRY%20ARCHES%20%20%20Clive%20Melbourne,%20Adrienn%20Tomor%20%20School%20of%20Computing,%20Science%20and%20Engineering,%20University%20of%20Salford

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FATIGUE PERFORMANCE OF FRP AND RADIAL-PIN
REINFORCEMENT ON MULTI-RING MASONRY ARCHES
Clive Melbourne, Adrienn Tomor School of
Computing, Science and Engineering, University
of Salford
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Background and context

• Many arch bridges need repairing and
  strengthening due to old age and increasing
  traffic loading.
• Current reinforcement techniques involve
  reinforcement at the intrados.
• Not much information on the long-term behaviour
  of strengthening techniques is available.

• As a consequence of old age and increasing
  traffic loading many arch bridges need repairing
  and strengthening.
• Current techniques involve reinforcement at the
  intrados.
• Performance of strengthening techniques has been
  mainly tested under static loading but their
  long-term behaviour is not well understood.

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Loading
Dead load
Live load
Cyclic loading
Static loading
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3M SPAN ARCHES (2 RINGS)
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5M SPAN ARCHES (3 RINGS)
under static and cyclic loading.
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Test series
Steel studs
Glass fibre sheet
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FRP reinforcement

• Glass fibre sheet (50/50 wave)
• was applied to the intrados

1. As the weakest form of composite.
2. To least influence the behaviour of the arch.

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TEST RESULTSFRP reinforcement
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FRP reinforcementStatic loading
Ring separation (Side)
Four hinge mechanism
Ring separation
Ring separation
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FRP reinforcementStatic loading
3m Span
5m Span
With FRP
Without FRP
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FRP reinforcementCyclic loading
Ring separation
Ring separation
Ring separation
Ring separation
With FRP
Without FRP
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FRP reinforcementCyclic loading
3m Span
5m Span
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FRP reinforcement summary

• RFP reinforcement
• reduced the load capacity under static loading by
  up to 30.
• increased the load capacity under cyclic loading
  by at least 20.
• can change the mode of failure.
• Delamination did not occur.

• FRP reinforcement reduced the load capacity under
  static loading by up to 30.
• FRP reinforcement increased the load capacity
  under cyclic loading by at least 20.
• The presence of FRP sheet can change the mode of
  failure of the arch.
• By preventing the formation of hinges, shear
  stresses are increased and can cause failure.
• Delamination occurred in limited areas but was
  not responsible for failure.

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TEST RESULTSRadial pinning
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Radial pinning

• Applied to FRP reinforced arches after ring
  separation occurred.
• Arches were drilled radially and Ø10mm steel
  studs installed in pairs.
• Cyclic loading
• was resumed

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Failure mechanism
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Radial pinningModes of failure
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Radial pinning failure mechanisms

• Ring separation changes the stress distribution
  within the arch ring.
• Radial pins can fail in a number of different
  ways

a) shear in pin b) Bearing/crushing c) Plastic
hinge d) Tension in pin e) Pull out
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Conclusions

• FRP reinforcement can reduce the load capacity of
  multi-ring arches.
• FRP reinforcement improved the fatigue
  performance.
• Radial pinning with FRP reinforcement reinstated
  and increased the original load capacity.

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END