s Truc t Integrity of Bldgs
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Transcript of s Truc t Integrity of Bldgs
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Blue CircleTechnical Centre
Structural Integrity of Buildingsand Plant
Dr Max Blackler
Head of Civil EngineeringBCTC Greenhithe, UK
by
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Bui ldings and Plant Structures do not last forever . What
we seek to achieve is rel iable service from these items
throughout the productive l i fe of the Plant.
Bui ldings and Plant Structures fail only rarely, but whenthey do, it usually makes headline news - something none
of us wants!
This Paper considers some of the issues that need to be
considered if the management of these assets is to beeffective and SAFE!
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Fitness for Purpose
Design Life
Changes that Occur
Causes of Degradation
Signs to Watch out for
Countermeasures
In this paper the following issues are considered:
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Load Carrying Capacity
Limiting Deflection
Durability
Codes of Practice
Quality of Construction
FITNESS FOR PURPOSE
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Typical heavy build up of dust
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Heavy Spillage on Open Grid Plant Floor
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Honeycombing in
Original Concrete
Beam
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Failure of interconnected
(Clustered) Silo for
Storage of Coal
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
A New Multi
Compartment Siloin
which one of the
internal radial dividing
walls has torn wayfrom the outer wall
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
A New Steel Silo that
developed a series of
Horizontal Folds as the topdescended 20ft towards the
Ground!
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
60,000t Cement Storage Dome Collapsed
during Construction
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Twin Steel Hopper for Rail
Car Loading - Failed inthe Armpit between the
Two Pyramidal Bottoms
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Load Carrying Capacity
Limiting Deflection Durability
Codes of Practice
Quality of Construction
FITNESS FOR PURPOSE
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
DESIGN LIFE
Operational life of the Plant Changes of Use
Fair Wear and Tear
Changes that Occur
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Note how theHorizontal Stiffeners
on this Feed Hopper
are not connected at
the corner
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
CHANGES THAT OCCUR
Silos and Hoppers
Warehouse Buildings
Diagonal Bracing
Gypsum and Corrosives
Modifications to Machinery
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Kiln Feed Silo attacked by Acidic
Fumes from Baghouse
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
200yds of 4x16 Line Pipe Collapsed onto Yard Area
when Retrofit Strongpoint let go
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
THINGS THAT CAUSE DETERIORATION Water
Chemicals
- Gypsum
- Fluorspar
- Calcium Chloride/De-Icing Salt
- Sea Salt- Coal Leachate
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Water/Corrosion Damage to Rebar in
Concrete Column in Derelict Plant
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Reactive Chemical (Fluoride?) Stacked
against Kiln Pier
S i f i i
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Side of Kiln Pier eroded by Chemical Attack
S l I i f B ildi d Pl
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Typical Heat + Rain Damage on Kiln Roller Station
St t l I t it f B ildi d Pl t
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Back End of Kiln Floor Weakened by Chemical Attack
from Kiln Seal Leakage
St t l I t it f B ildi d Pl t
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
SIGNS TO WATCH OUT FOR:
Water
Line and Level
Cracks in Steelwork
Cracks in Concrete
Suspended Hoppers
Rectangular Hollow Steel Sections
St t l I t it f B ildi d Pl t
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Heavy Dust Spillage+Rainwater Ponding on Silo Roof
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Str ct ral Integrit of B ildings and Plant
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Define and agree Performance Requirements before
Design is started Identify who is to do what before Project starts
Pre-qualify Bidders before Tender Invitation
Confirm Key Performance Requirements before
starting contract negotiations
COUNTERMEASURES
Structural Integrity of Buildings and Plant
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Watch out for Water and deal with it properly
Apply Permit to Work Procedures
Train Operational Personnel in Structural Awareness
5Yearly Independent Structural Inspection Surveys
COUNTERMEASURES(cont.)
Structural Integrity of Buildings and Plant
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Group of post-tensioned (Pre-Stressed) Silos - note
Pilasters in the Walls
Structural Integrity of Buildings and Plant
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Blue CircleTechnical Centre
Structural Integrity of Buildings and Plant
Fitness for Purpose
Design LifeChanges that Occur
Causes of Degradation
Signs to Watch out for
Countermeasures
We have now Looked at our L ist of I ssues. These were:
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