effective bridge management · bd21/01, ba16/97, etc for structures designed pre-bs5400. • if...
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Effective Bridge Management
Area Engineers March 2014
Liam Duffy - National Roads Authority
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Overview
• Introduction • Inspection types
• Factors affecting bridge durability
• Bridge Defects
• Structural Capacity Assessments • Repairs and Strengthening
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Long Life Bridges: Adare Bridge Co. Limerick
Irish Stone Bridges (O’Keeffe and Simington): “...there is no reason to dispute the date range 1390-1410...” Irish Stone Bridges (O’Keefffe and Simington): “...Richly mantled with ivy, this ancient Bridge is very picturesque, blending as it were with the ivy-clad walls of the castle...”
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Effective Bridge Management
Strengthening Works
Routine Maintenance
Inspections Principal, Special, Routine
Effective Bridge Management
Durability & Repair Works
Structural Assessments
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Bridges on the NRA Network
• Almost 3,000 structures on NP & NS network > 2.0m span • 60% Concrete, 27% Masonry, 8% Steel • Not responsible for managing PPP bridges although we monitor
the Concessionaire’s management of bridges • MMaRC Contractors responsible for RM for bridges on their
networks & NRA manage structural work
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Eirspan Database
• New desktop version of database for Regional Road bridges will issue to LAs next month from NRA IT
• Existing data requires converting by NRA IT • Booklet with screenshots from database explaining
data transfer etc. • New web-based version for NRA bridges
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Inspection Types
• Routine Inspection • Previously an annual inspection by LAs • Engage consultants now
• Principal Inspection • Structural inspection by experienced bridge engineers • Interval 1-6 years
• Special Inspection • Defect investigation, underwater inspection, assessment
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Routine inspection and maintenance
Vegetation clearance prevents stonework deterioration, debris clearance from watercourses prevents scour damage
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Scour Damage & Scour Susceptibility
Scour: •Debris build-up must be cleared when found •BD97/12 Assessment of scour at highway bridges •CIRIA C551 Manual on scour at bridges and other hydraulic structures
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PI – Inspect difficult access components
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Special Inspection - Youghal Bridge PTSI Phase 3 Inspection
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Factors affecting durability
Leaking expansion joint or failed waterproofing. Modern construction of integral bridges where possible.
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Waterproofing Application & Testing
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Bridge Inspector Decisions – RC Defects
• BA 35/90 Inspection and repair of concrete highway structures • CBDG Technical Guide 2: Testing & monitoring the durability of concrete structures
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Leenane Bridge collapse
Build-up of debris at bridge following rainfall which exceeded 1/100yr return
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Bridge Inspector Decisions – Parapet Damage
Is the failure mode of these parapets correct? Inspector to check for cracked posts
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Bridge Inspector Decisions –Steel Defects
BD12 includes for concrete invert to prevent such corrosion.
Plate Girder corrosion
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Structure Work Types and Numbers
Road Bridge Replacement, 68
New or Replacement Footbridge, 7
Bridge Widening, 29
Masonry Arch Bridge Strengthening or
Rehabilitation, 134
Concrete Bridge Strengthening or Rehabilitation, 68
Steel Bridge Strengthening or Rehabilitation, 14
Expansion Joint Replacement Only, 85
Parapet and Safety Barrier
Only, 66
Scour Repair Only, 9 Retaining Wall Works
Only, 4
Structure Work Types and Numbers Road Bridge Replacement
New or Replacement Footbridge
Bridge Widening
Masonry Arch Bridge Strengthening or Rehabilitation Concrete Bridge Strengthening or Rehabilitation Steel Bridge Strengthening or Rehabilitation
Expansion Joint Replacement Only
Parapet and Safety Barrier Only
Scour Repair Only
Retaining Wall Works Only
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Issues to Consider Before Repair • Condition rating & likely rate of deterioration • Durability • Structural capacity – assessment should be
considered before significant repairs. Assess using BD21/01, BA16/97, etc for structures designed pre-BS5400.
• If bridge fails assessment, strengthening may be required
• No link between condition rating & assessed capacity • Whole life cost – is it better to undertake cyclical
concrete repairs to a slab soffit or replace the deck?
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Assessments
Coring to determine arch barrel depth
Rare example of failure under load
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Repair historic structures sympathetically
New NRA Specification Series 2400. Lime mortar 1part NHL5 to 2.5 parts well-graded sand, full joints, stonework to match existing
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Bridge Management Issue - Services
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Poor Aesthetics, Durability Issues
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Expansion Joint Awareness
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Masonry arch construction
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