assessment and repair of fire damaged structures -...
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Assessment and Repair of Fire pDamaged Structures
Yong WangUniversity of Manchester UKUniversity of Manchester, UK
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Outline of Presentation
General introduction: reparability, difference between assessment for difference between assessment for repair and fire resistant designG l dGeneral procedureMethods of assessmentMethods of repairUseful referencesUseful references
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General Introduction
Many fire damaged buildings
Cost of structural repair often only a da aged bu d gs
are repairableepa o te o y a
small proportion of total repair bill
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Assessment Procedure
Site visitDesk studyDesk studyDetailed collection of evidenceDamage assessmentSpecification of repairsSpecification of repairs
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Site Visit
To gain early scale of damageTo advise on safety of building and To advise on safety of building and to recommend protection measures
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Desk Study
To collect relevant information, e.g. original design of building original design of building, construction materials, usage before fire cause of fire duration of fire fire, cause of fire, duration of fire, fire spread, contents left unburntT t bli h t t f To establish a strategy for more detailed information gathering
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Detailed Assessment Strategy
No damageTotal damage scrapTotal damage – scrapMajor damage – replacement of structural memberRepairable damages - detailed p gcollection of evidences
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Detailed Collection of Evidence
Residual strength and stiffness of material after fire exposure (NDT)material after fire exposure (NDT)Temperature attained in structureFire development
Correlation of results
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Fire Developments
Burnt combustible materialsOpeningOpeningConstruction materials of enclosure
Correlation with physical evidenceCorrelation with physical evidence
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Temperatures Attained in Structural Members
Fire development + thermal analysisFire development + thermal analysisMetallurgy analysisColour changes in concreteMore detailed testing: More detailed testing: thermoluminescence testPhysical evidencePhysical evidence
C l i f lCorrelation of results
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Mechanical Properties
Temperatures + residual properties relationshipsrelationshipsNon-destructive testingDestructive testing
Correlation of results
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Schmit Hammer Test
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Ultrasonic Pulse Velocity Test
Pulse generating, analysis and transmit time display apparatus
Receiving transducer
Transmitting transducertransducer
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Destructive Tests
Concrete core testsFracture tests of steelFracture tests of steel
Use them sparingly!
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Design Calculations for Repair
Load:Include extra weight of repair Include extra weight of repair materialsTemporary support loadsReduced material factors
Treat structure as simply supported Treat structure as simply supported
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Repair Methods
ReconstructionSprayed concreteSprayed concreteResin repairOvercladdingOthers: FRP strengthening change Others: FRP strengthening, change of use, additional supports
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Useful Documents
Testing concrete in structures, a guide to equipment for testing concrete in
C h l 3structures, CIRIA technical report 143, 1992The reinstatement of fire damaged steel The reinstatement of fire damaged steel and iron framed structures, Corus (British Steel), 1986Assessment and repair of fire-damaged concrete structures, Concrete Society technical report 33 1990technical report 33, 1990Appraisal of existing structures, ISE, 1996