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Increased load capacity of arch bridge using slab reinforced concrete. T.G. Hughes & M. Miri Cardiff School of Engineering Arch 04, Barcelona, Nov. 17-19, 2004 . Outline. Introduction Strengthening Techniques Model details and description Soil / Masonry interaction Service load results

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increased load capacity of arch bridge using slab reinforced concrete

Increased load capacity of arch bridge using slab reinforced concrete

T.G. Hughes & M. Miri

Cardiff School of Engineering

Arch 04, Barcelona, Nov. 17-19, 2004

outline
Outline
  • Introduction
  • Strengthening Techniques
  • Model details and description
  • Soil / Masonry interaction
  • Service load results
  • Ultimate load results
  • Conclusions
introduction
Introduction
  • Considerable interest in the UK in repair techniques
  • Closure of the road during construction is an issue
  • Much debate about “Strengthening” v “Repair”
  • Objective of this study – to investigate a less intrusive form of reinforcement
strengthening techniques
Strengthening Techniques
  • Grouting
  • Saddling
  • Lining
  • Reinforced masonry
grouting
Grouting
  • Effectively stiffens soil and random rubble masonry
  • Can be achieved with minimum disruption from surface or soffit
  • Unquantifiable improvement
  • May create difficulties with future flexibility
saddling
Saddling
  • Forms new arch with existing barrel as shutter
  • Disruptive to traffic during construction
  • Composite action difficult to model
  • A “new” bridge
  • Some question marks on long term flexibility
lining
Lining
  • Less disruption during construction
  • Normally “adds” to existing barrel
  • Loss of headroom
  • Loss of visual effect
  • Some concern about durability
reinforced masonry
Reinforced Masonry
  • Undertaken by drilling or slot cutting in intrados
  • Can be achieved with minimum disruption
  • Slot cutting can cause loss of visual effect
  • May create difficulties with future flexibility
  • May be issues about long term durability of bond between reinforcement and masonry
surface slab reinforcement10
Surface Slab Reinforcement
  • Can be achieved with minimum disruption
  • Maintains integrity of arch behaviour
  • Issues about utility service access
  • Relatively cheap solution
surface slab reinforcement11
Surface Slab Reinforcement
  • Works by increasing load distribution without increasing load
  • Also provides additional support to soil in preventing sway movements
  • Increases resistance of soil
centrifuge models
Centrifuge Models
  • Undertaken some 50+ scale models of arch bridges at 6, 12g, 20g and 55g
  • Stresses are as full scale, similar materials –therefore full scale strains
  • Full range of instrumentation pressure sensors, LVDTsm Load cells and moving loads
model description
Model description
  • 1/12 scale, 6-m single span
  • Shallow & Deep geometry
  • Three ring arch
  • Bricks
  • Micro concrete
  • Reinforcement
test methodology
Test Methodology
  • Build “New” Arch
  • Undertake service load – typically 14 passes
  • Load at 1/4 or 1/3 point to peak and unload
  • Remove and strengthen
  • Repeat service loading
  • Load at 1/4 or 1/3 point until collapse
service load
Service load
  • Steel roller (equal 12 tonnes)
  • Whole Width
  • Soil / Masonry interaction
  • Arch deflection
  • Load direction effect
result nomenclature
Result Nomenclature
  • Actual benchmark (“new”) result
  • Average over a series of “new” arches
  • Strengthened result
conclusions
Conclusions
  • Better distribution of pressures within the soil at service loads
  • Decrease arch deflection after repair at service loads
  • Significant improvement in ultimate load capacity
conclusions34
Conclusions
  • Construction with limited disruption
  • Reinforced concrete equally as effective as when acting compositely with the barrel
  • Should maintain flexibility of exiting arch to respond to future movements