Structural Health Monitioring_ppt

58
STRUCTURAL HEALTH MONITORING (SHM) (SHM) dr.ing. NAGYͲGYÖRGY Tamás lecturer 2012v1

description

It gives details about the methods to structurally monitor the health of the current building stock.

Transcript of Structural Health Monitioring_ppt

Page 1: Structural Health Monitioring_ppt

STRUCTURALHEALTHMONITORING

(SHM)

(SHM)

dr.ing.N

AGYGYÖ

RGYTamás

lecturer

2012v1

Page 2: Structural Health Monitioring_ppt

REFERENCES

•SHM

http://wwwshmlivecom/

•SHM

http://www.shmlive.com/

•SAMCO

http://www.samco.org/network/index.htm

•ISISandSAMCOEducationalModule5:AnIntroductiontoStructuralHealth

Monitoring

Monitoring

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INTRODUCTION

WhyweneedSHM?

•Populationdependsonanextensiveinfrastructuresystem

roads

highways

highways

buildings

…etc

•Theinfrastructuresystemhassuffered

neglect

dti

tideterioration

lackoffunding

GlobalInfrastructure

Crisis

ISIS

Canada E

ducational M

odule

5

GlobalInfrastructure

Crisis

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INTRODUCTION

WhyweneedSHM?

•Factorsleadingtotheextensivedegradation

Factor1

Unsatisfactoryinspectionandmonitoringof

Factor1

Unsatisfactoryinspectionandmonitoringof

existinginfrastructure

Consequences:

Problemsbecomeapparentonlywhen

structuresareindireneedofrepair

Result

Repaircostsbecomecomparableto

replacementcosts

ISIS

Canada E

ducational M

odule

5

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INTRODUCTION

WhyweneedSHM?

•Factorsleadingtotheextensivedegradation

Factor2

Corrosionofconventionalsteel

Factor2

Corrosionofconventionalsteel

reinforcementwithinconcrete

Consequences:

Expansionofsteelleadstocrackingand

spalling,furtherdeterioration

Result

Reductionsin

strength

andserviceability,

resultingin

needforrepairand/orreplacement

ISIS

Canada E

ducational M

odule

5

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INTRODUCTION

WhyweneedSHM?

•Factorsleadingtotheextensivedegradation

Factor3

Increasedloadsordesignrequirementsover

Factor3

Increasedloadsordesignrequirementsover

time(e.g.heaviertrucks)

Consequences:

Increaseddeteriorationduetooverloadsor

tostructuralinadequaciesresultingfromdesign

Result

Structuresdeemedunsafe

orunserviceable

andstrengtheningorreplacementisrequired

ISIS

Canada E

ducational M

odule

5

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INTRODUCTION

WhyweneedSHM?

•Factorsleadingtotheextensivedegradation

Factor4

Overalldeteriorationand/oraging

Factor4

Overalldeteriorationand/oraging

Consequences:

Variousdetrimentaleffectsonstructural

performance,bothsafetyandserviceability

Result

Needforrepair,rehabilitation,

strengtheningorreplacement

ISIS

Canada E

ducational M

odule

5

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INTRODUCTION

Materials&Technologies

SHM

FRP

++

Newandinnovative

materialsandmonitoringtoolsthatprolong

theservicelivesofstructureswhiledecreasingcosts

ISIS

Canada E

ducational M

odule

5

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WHATISSHM?

Assessingtheinserviceperform

anceofstructuresusingavariety

ofmeasurementtechniques

Leadingto“smart”structures

EXTERNAL

DISTURBANCES

STRUCTURE

RESPONSE

SENSORS

ACTUATORS

CONTROLLER

ISIS

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ducational M

odule

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WHATISSHM?

Inspection

Onsitenondestructiveexaminationtoestablish

thepresentconditionofthestructure

p

Loadtesting

Testofthestructureorpartthereofbyloadingto

ealateitsbehaiororpropertiesortopredictits

evaluateitsbehaviororproperties,ortopredictits

loadbearingcapacity

Monitoring

Frequentorcontinuous,normallylongterm,

observationormeasurementofstructuralconditionsor

actions

Bjö

rnT

äljs

ten

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WHATISSHM?

Whymonitoring?

followupphysicalphenomenon

checkuotthecalculationmodels

Bjö

rnT

äljs

ten

checkuotthecalculationmodels

assessmentofstructures

verificationofthestrengtheningeffects

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WHATISSHM?

WhatisSHM

becomingpopular?

Emerginguse

ofSHM

isaresultof:

1.Theincreasingneedfor

Monitoringofinnovativedesignsandmaterials

Bettermanagementofexistingstructures

Bettermanagementofexistingstructures

2.Theongoingdevelopmentof

N(

Fib

OtiS

(FOS)“

t”Newsensors(e.g.FiberOpticSensors(FOS),“smart”

materialsetc.)

Dataacquisitionsystems(DAS)

Wirelessandinternettechnologies

Datatransmission,collection,archivingandretrievalsystems

Dataprocessingandeventidentification

Dataprocessingandeventidentification

ISIS

Canada E

ducational M

odule

5

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WHATISSHM?

BodyAnalogy

dl

MedicalDoctor

SHM

Engineer

•Monitorpatient’shealth

•Usesmedicalequipment

•Monitorconditionofstructures

•Usessensorsto

check

overall

•Usesmedicalequipment

tocheck

overallhealth

•Prescribescorrective

dii

ifi

d

•Usessensorsto

check

overall

structuralhealth

•Ifexcessivestress

or

df

titit

timedicineifrequired

deform

ation,correctsituation

ISIS

Canada E

ducational M

odule

5

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WHATISSHM?

System

Components

AcquisitionofData

CommunicationofData

IntelligentProcessing

IntelligentProcessing

http://www.smartstructuresinc.com

StorageofProcessedData

RetrievalofData

Diagnostics

ISIS

Canada E

ducational M

odule

5

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WHATISSHM?

SHM

Categories

StaticField

Testing:

Behaviourtests

DynamicField

Testing:

Stresshistorytests

Behaviourtests

Diagnostictests

Prooftests

yAmbientvibrationtests

Dyn.LoadAllowance(DLA)tests

Pullback(anchoredcables)tests

Pullback(anchoredcables)tests

PeriodicMonitoring:

Fieldtesting

ContinuousMonitoring:

Activemonitoring

Fieldtesting

Teststodetermine

changesinstructure

Activemonitoring

Passivemonitoring

ISIS

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ducational M

odule

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WHATISSHM?

ClassificationofSHM

Systems

LevelIV

Detectpresence

locationseverityandconsequencesofdamage

Detectpresence,location,severityandconsequencesofdamage

LevelIII

LevelIII

Detectpresence,locationandseverityofdamage

lLevelII

Detectpresenceandlocationofdamage

LevelI

Detectpresenceofdamage

ISIS

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ducational M

odule

5

Detectpresenceofdamage

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WHATISSHM?

ClassificationofSHM

Systems

ISIS

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ducational M

odule

5

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WHATISSHM?

AdvantagesofSHM

AdvantagesofSHM

Increasedunderstandingofinsitustructuralbehaviour

g

Earlydamagedetection

Assurancesofstructuralstrengthandserviceability

Assurancesofstructuralstrengthandserviceability

Decreaseddowntimeforinspectionandrepair

/Developmentofrationalmaintenance/managementstrategies

Increasedeffectivenessinallocationofscarceresources

Enablesandencouragesuseofnewandinnovativematerials

ISIS

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odule

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METHODOLO

GY

•IdealSHMsystem:

1.Informationondemandaboutastructure’shealth

2.Warningsregardinganydamagedetected

•DevelopmentofaSHMsysteminvolvesutilizing

informationfrommanydifferentengineeringdisciplines

informationfrommanydifferentengineeringdisciplines

Computers

Materials

Ci

iCommunication

Structures

Sensors

DamageDetection

ISIS

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ducational M

odule

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DamageDetection

IntelligentProcessing

DataCollection

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METHODOLO

GY

System

Components

ISIS

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ducational M

odule

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METHODOLO

GY

Monitoringprinciples

BasicMonitoringMethodology

BasicMonitoringMethodology

Competenceofthe

bid

i

Monitoring

objectives

bridgeengineer

What?

Where?

Bridgemodel

Constraints

Where?

When?

Designmodel

monitoringsystem

How?

Designofphysical

monitoringsystem

Installationofphysicalmonitoring

system

Competenceofthe

monitoringengineer

system

Validationofmodelandphysical

monitoringsystem

Aft

er

Gla

uco

Feltrin, E

MP

A,

2007

Maintenanceofmodelandphysical

monitoringsystem

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METHODOLO

GY

Monitoringprinciples

MonitoringPrinciples

0

0.05

m]

MonitoringPrinciples

01

23

45

6-0

.1

-0.0

5

d [mm

Dis

pla

cem

ent

D1

0

0.05

mm]

Interactionbridge

01

23

45

6-0

.1

-0.0

5

d [m

Dis

pla

cem

ent

D2

time

[s]

Domodelresultsmatch

Improved

lti

model/monitoring

withmonitoringresults?

correlation

Mdifiti

fdl

Bjö

rnT

äljs

ten

Modificationofmodel

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METHODOLO

GY

Monitoringprinciples

Monitoring

Monitoring

Verificationbymonitoring–notnew

TestingofasteeltrussinEnglandforarailwaybridgeinIndiainthe19thcentury

ISIS

Canada E

ducational M

odule

5

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METHODOLO

GY

1–AcquisitionofData

Thecollectionofrawdata:strains,deformations,

accelerations,temperatures,moisturelevels,acoustic

ii

dld

emissionsandloads

(a)SelectionofSensors

() Appropriateandrobustsensors

Longtermversusshorttermmonitoring

Longtermversusshorttermmonitoring

Whataspectsofthestructurewillbemonitored?

Sensorsmustserveintendedfunctionforrequiredduration

Sensorsmustserveintendedfunctionforrequiredduration

ISIS

Canada E

ducational M

odule

5

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METHODOLO

GY

1–AcquisitionofData

(b)SensorInstallationandPlacement

Mustbeabletoinstallsensorswithoutalteringthebehaviourof

g

thestructure

Featuressuchassensorwiringconduitjunctionboxesandother

Featuressuchassensorwiring,conduit,junctionboxesandother

accessoriesmustbeaccountedforintheinitialstructuraldesign

ISIS

Canada E

ducational M

odule

5

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METHODOLO

GY

1–AcquisitionofData

(c)Transferto

Data

AcquisitionSystem

(DAS)

•Method1

Leadwire

directphysicallinkbetweensensorandDAS

leastexpensiveandmostcommon

leastexpensiveandmostcommon

notpracticalforsomelargestructures

longleadwiresincreasesignal“noise”

•Method

Wireless

transm

ission

Moreexpensive

Moreexpensive

Signalsaretransferredmoreslowlyandarelesssecure

Useisexpectedtoincreaseinthefuture

ISIS

Canada E

ducational M

odule

5

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METHODOLO

GY

1–AcquisitionofData

(d)Data

SamplingandCollection

GeneralRule:

Theamountofdatashouldnotbesoscantyasto

jeopardize

itsusefulnessnorshoulditbesovoluminousasto

itsusefulness,norshoulditbesovoluminousasto

overwhelminterpretation

Issues:Numberofsensorsanddatasamplingrates

Datasortingforonsitestorage

Datasortingforonsitestorage

Insomecases,largevolumesofdata

Rlt

ISIS

Canada E

ducational M

odule

5

Result: Efficientstrategiesneededfordatasamplingandstoring

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METHODOLO

GY

1–AcquisitionofData

ISIS

Canada E

ducational M

odule

5

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METHODOLO

GY

1–AcquisitionofData

Whatismonitored,howandwhy?

Ld

Load

Magnitudeandconfigurationofforcesappliedtoa

structure

structureAretheyasexpected?

Howaretheydistributed?

Measuredusingloadcellsorinferredusingstraindata

Measuredusingloadcellsorinferredusingstraindata

Deform

ation

Excessiveorunexpecteddeformation,mayresultinaneed

forrehabilitationorupgrade

Aretheyasexpected?

ISIS

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ducational M

odule

5

Aretheyasexpected?

Measuredusingvarioustransducers

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METHODOLO

GY

1–AcquisitionofData

Strain

Intensityofdeformation

Magnitudeandvariationofstrainscanbeexaminedto

evaluatesafetyandintegrity

Measuredusingstraingauges

gg

gFOS,electrical,vibratingwire,etc.

Tt

Temperature

Changesintemperaturecausedeformation

ThermalExpansion

pRepeatedcyclescancausedamage

Temperatureaffectsstrainreadings

Tempmustbe“removed”fromstraindata

ISIS

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odule

5

Tempmustberemovedfromstraindata

MeasuredusingThermocouples(TC),Temperature

IndicatorControllers(TIC),thermistors

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METHODOLO

GY

1–AcquisitionofData

Acceleration

Loadscauseaccelerationsofstructuralcomponentsand

viceversa Howisthestructureresistingaccelerationsandthe

resultingloads?

gWidespreaduseinhighlyseismicregions

Measuredusingaccelerometers

WindSpeedandPressure

Windloadscangovernthedesignoflongspanbridgesand

gg

gp

gtallbuildings

Recordspeedandpressureatvariouslocations

Measuredusinganemometers

ISIS

Canada E

ducational M

odule

5

Measuredusinganemometers

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METHODOLO

GY

1–AcquisitionofData

AcousticEmissions

Whencertainstructuralelementsbreak,theyemitnoise

lf

hd

lAElistensforthenoises,andpinpointslocations

usingtriangulation

Usedinposttensionedconcreteandcablestayed

py

structures

Measuredusingmicrophones

VideoMonitoring

Timestampedvideosandpicturescanbeusedtowitness

pp

extremeloadsorevents

Datacanbecorrelatedwithimages

Permitsfindingofoverloadedtrucks IS

IS C

anada E

ducational M

odule

5

Permitsfindingofoverloadedtrucks

Emerginginternetcameratechnologyisused

Page 33: Structural Health Monitioring_ppt

METHODOLO

GY

2–CommunicationofData

•ReferstodatatransferfromtheDAStoanoffsitelocation

•Allowsforremotemonitoring,eliminationofsitevisits

Telephone

lines

DAS

Internet

Offsite

Location

Wireless

technologies

Location

ISIS

Canada E

ducational M

odule

5

technologies

Page 34: Structural Health Monitioring_ppt

METHODOLO

GY

3–IntelligentProcessingofData

•Requiredbeforedatacanbestoredforlaterinterpretation

andanalysis

•Thegoalistoremovemundanedata,noise,thermal,or

otherunwantedeffectsandtomakedatainterpretation:

otherunwantedeffectsandtomakedatainterpretation:

Easier

Faster

Moreaccurate

ISIS

Canada E

ducational M

odule

5

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METHODOLO

GY

4–StorageofProcessedData

•Datamaybestoredforverylongperiodsoftime

Retrieveddatamustbeunderstandable

Datamustnotbecorrupted

Sufficientmemorymustbeavailable

•Datafilesmustbewelldocumentedforfuture

interpretation

interpretation

•Itiscommontodisregardrawdataandstoreonly

processedoranalyzeddata

Thisdoesnotallowforreinterpretation

ISIS

Canada E

ducational M

odule

5

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METHODOLO

GY

5–Diagnostics

•Extremelyimportantcomponent

Convertsabstractdatasignalsintouseful

informationaboutstructuralresponseandcondition

•No“standard”rulesexistfordiagnostics

•Nostandardrulesexistfordiagnostics

•Methodologyuseddependson

Methodologyuseddependson

Typeofstructure

Typeandlocationofsensorsused

Motivationformonitoring

Structuralresponsesunderconsideration

ISIS

Canada E

ducational M

odule

5

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METHODOLO

GY

6–Data

Retrieval

•Whenstoringdataforretrieval,consider

1.Significanceofdata

2.Confidenceinanalysis

Rem

ember:

ThegoalofSH

Misto

providedetailedphysicaldata

which

ThegoalofSH

Misto

providedetailedphysicaldata

which

canbeusedto

enablerational,knowledgebased

engineeringdecisions.

ISIS

Canada E

ducational M

odule

5

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SENSORTECHNOLO

GY

•Manysensortypesarecurrentlyavailable

ChoiceforSHMdependsonvariousfactors

•Fibreopticsensors(FOSs)

Newerclassofsensors

Newerclassofsensors

Emergingforinfrastructureapplications

ISIS

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ducational M

odule

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SENSORTECHNOLO

GY

FOS

FOSAdvantages:

Stability

Increasedlongtermstabilityanddecreased

noise

Nonconductive

Immunetoelectromagneticandradio

frequencyinterference

frequencyinterference

Flexibility

MultiplexingandDistributedsensing

Convenience

Light,smalldiameters,noncorrosive,

bddbl

ilb

dbl

ISIS

Canada E

ducational M

odule

5

embeddable,easilybondable

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SENSORTECHNOLO

GY

HowdoFOSswork?

Sensingusingopticalfibresandtechniques

hb

(l)

dlfb

dd

Lightbeam

(laser)issentdownanopticalfibretowardagauged

length

Lightwavesmeasurechangesinstate(i.e.elongationorcontraction)

gg

(g

)Changeinreflectedlightwavesiscorrelatedtostrainreading

Demodulationunitcalculatesstrainfromlightsignalsandgives

voltage

voltage

DASconvertsvoltagetostraindataforprocessing

ISIS

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odule

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SENSORTECHNOLO

GY

SensorTechnology

ISIS

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ducational M

odule

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SENSORTECHNOLO

GY

SensorTechnology

Characteristics:

fdd

Useforstaticanddynamicmonitoring

Embeddable,bondableandweldable

Gaugelengthcanvaryfromcm

tomorethan1km

gg

yThermalandmechanicalstrainscanbeseparated

Usefultomeasure:

Usefultomeasure:

Widthofcracks

Straintransferinbondedjoints

Si

Stressconcentrations

ISIS

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ducational M

odule

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Page 43: Structural Health Monitioring_ppt

SHM

SYSTEM

DESIGN

1.DesignIssues

DefinitionofSHMobjectives

Typesofmonitoring

Sensorplacement

p

DurabilityandlifespanofSHM

ISIS

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ducational M

odule

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SHM

SYSTEM

DESIGN

2.InstallationIssues

Contractoreducation

Sensoridentification

Sensordamageduring

construction

Structuralchangesinducedby

fpresenceofSHMsystem

Pi

i

ISIS

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ducational M

odule

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Protectionagainst

deteriorationandvandalism

Page 45: Structural Health Monitioring_ppt

SHM

SYSTEM

DESIGN

3.Use

Issues

Disseminationof

performanceresults

Continuityofknowledge

yg

lld

Datacollectionand

management

Publicawareness

ISIS

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odule

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SHM

SYSTEM

DESIGN

Methodology

dfhd

dh

1.Identifythedamageordeteriorationmechanisms

2Categorizeinfluenceofdeteriorationonthemechanical

2.Categorizeinfluenceofdeteriorationonthemechanical

response Theoreticalandnumericalmodelsofstructure

3.Establishcharacteristicresponseofkeyparameters

Etblih

itiit

fht

itl

lf

Establishsensitivityofeachtoanappropriatelevelof

deterioration

4.Selecttheparametersanddefineperformanceindex

Relateschangesinresponsetolevelofdeterioration

ISIS

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odule

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SHM

SYSTEM

DESIGN

Methodology

5.Designsystem

Selectionofsensors,dataacquisitionandmanagement

Datainterpretation

Datainterpretation

6.InstallandcalibrateSHMsystem(baselinereadings)

7.Assessfielddataandadaptsystemasnecessary

ISIS

Canada E

ducational M

odule

5

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THEFUTUREOFSHM l

lh

•SHMisincreasinglyseenasanimportanttoolinthe

maintenanceofsustainableinfrastructuresystems

Ongoingadvancementsareexpected,emerging

technologiesinclude:

g SmartComposites

LiveStructures

ISIS

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THEFUTUREOFSHM

SmartComposites

SmartComposites

Composites(egFRP)withsensorsembeddedinsidethat

Composites(e.g.FRP)withsensorsembeddedinsidethat

provideinformationabouttheconditionofthestructural

component

p

Muscle/M

emberAnalogy:

Muscleshavenervecells

embeddedinthemthatprovide

informationtothebrainabout

Smartcompositeshavesensors

insidethatprovideinformation

aboutthestructuralmembers’

informationtothebrainabout

theconditionsofthemuscles

aboutthestructuralmembers

condition

ISIS

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odule

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Page 50: Structural Health Monitioring_ppt

THEFUTUREOFSHM

SmartComposites

LiveStructures

•Representthecuttingedgeofcivilengineeringdesignand

•Representthecuttingedgeofcivilengineeringdesignand

analysis

•Livestructuresarecapableof:

Sensingloads,deformations,anddamage

Correctingandcounteringtheloadeffects

•Presentlystructuresarelargelytheoretical

•Presentlystructuresarelargelytheoretical

•Accomplishedusingemergingselfactuatingmaterials

ISIS

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pg

gg

g

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SUMMARYANDCONCLU

SION

llh

StructuralHealthMonitoring

Providesthecivilengineeringcommunitywithasuiteof

Providesthecivilengineeringcommunitywithasuiteof

optionsformonitoring,analysingandunderstandingthe

healthofourinfrastructures ystems

y

Provideessentialtoolstoengineerswhomusttakesteps

toim

provethesustainabilityofinfrastructuresystems

ISIS

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odule

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SUMMARYANDCONCLU

SION

CaseStudy

TheÖrnsköldsviksbridge

2006

Step1

Enhancedassessment

Assessmentprocedureforthebridge

CaseStudy–TheÖrnsköldsviksbridge

2006

Step1

Initialassessment

•Sitevisits

several

Enhancedassessment

•Laboratoryinvestigations

•InvestigationsofLoadModels

•Reliabilitybasedinvestigations

Step3

•Studyofdocuments

•Studyandcarriedout

simplecalculations

•Reliabilitybasedinvestigations

•Strengtheningcalculations

•Monitoring

•Refinedcalculations,FEmodels

•Decisionanalysis

•Decisionanalysis

Intermediateassessment

•Furtherinspections

•Materialtestingcoresetc

Destructivetesting

Step2

Materialtesting,coresetc

•Detailedcalculations

•Investigationsofloadingetc

•Planningfortestingetc

•SimpleFEModels

•DesignModels

•UltimateLimitState

•Verification

Dild

li

Bjö

rnT

äljs

ten

Step4

SimpleFEModels.

•Detailedanalysis

•NonlinearFEModels

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SUMMARYANDCONCLU

SION

CaseStudy–TheÖrnsköldsviksbridge

2006

yg

StructuralAssessment

S1:Survey

S1:Questionnaire

Bridgeowner/Consultant

Bridgeowner/consultant

S2:Conditionassessment

VisualInspections

S2:SimpleFE

Consultant

S2:Nondestructivetests

VisualInspections

Radar,ultrasonictestsetc.

S2:Materialsamples

Radar,ultrasonictestsetc.

S3:Laboratorytesting B

jörn

Täljs

ten

Drillingofcores,pulloffetc.

Concrete,Steeletc.

Page 54: Structural Health Monitioring_ppt

SUMMARYANDCONCLU

SION

CaseStudy–TheÖrnsköldsviksbridge

2006

yg

StructuralAssessment

S3:Sensorinstallation

Specialistconsultant

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130

Slab

26

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A1 Ö

30

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A5 V

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130

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S4:Loadtest1

Testinginstitutes

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S4:Strengthening

Specialistcontractors

S4:Loadtest2

Testinginstitutes

S4:Detailedevaluation

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äljs

ten

Page 55: Structural Health Monitioring_ppt

SUMMARYANDCONCLU

SION

CaseStudy–TheÖrnsköldsviksbridge

2006

yg

PredictedLoadCarryingCapacity

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ten

Page 56: Structural Health Monitioring_ppt

SUMMARYANDCONCLU

SION

CaseStudy–TheÖrnsköldsviksbridge

2006

yg

PredictedLoadCarryingCapacity

•Eurocode2,

=30o

P=6,1MN

•Eurocode2,

=22o

P=8,8MN

Eurocode2,

22

P8,8MN

•MCFT,Response,

30o

P=8,7MN

•2DNonlinearAtena

30o

P=108MN

•2DNonlinear,Atena,

30

P=10,8MN

•Test,

30o

P=11,7MN

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Page 57: Structural Health Monitioring_ppt

SUMMARYANDCONCLU

SION

Periodiclongtimemonitoring

CaseStudy–Kallkällan1998

80.0

0

Strains

40.0

0

60.0

0

rain [e-6]

Stas

20.0

0

St

0.0

0

Tim

eB

efo

re s

treng

then

ing

After

stre

ngth

enin

g"L

ong-t

erm

" behavi

or

Measurementofstrains

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Page 58: Structural Health Monitioring_ppt

END

END

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