Seismic vulnerability and building performance for structures and MEP Equipment
Seismic Vulnerability of Building stocks.pptx
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Transcript of Seismic Vulnerability of Building stocks.pptx
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Pradeep P
CE11M104
Seismic
VulnerabilityAnalysis of
Building stocks
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Seismic risk assessment is done on te
follo!ing steps"#• $a%ard Analysis• &ocal site e'ects
• Structural (n)entory• Vulnerability Analysis• Estimation of risk * loss
Assessing seismic )ulnerability is done from
early +0,s
Eart-uake loss model
(ntroduction
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.isk mitigation e'orts
Prediction of Economic (mpact for futureeart-uake
Planning for .etro/tting structures
EE for V2&E.AB(&(3 Analysis
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• 3o generate )ulnerability cur)es for .C *Masonry structures to (ndian Building stock5
Scope
i5 P6A is te 6round motion (nde7ii5 Suite of natural compatible accelerograms
iii5 2sing Ad)anced Capacity Spectrum Metod
i)5 Performance limit states are prede/ned
)5 SS( is incorporated subse-uently
8B9EC3(VE * SC8PE
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• Conditional probability tat te structure,sresponse :)ulnerability function; e7ceedingte performance &S5
Vulnerability cur)es
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Vulnerabilitycur)es
Empiricalmetods
Analyticalmetods
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Metodology
Vulnerability CurveGeneration
Building capacityEart-uake demand
StructuralAssessment
3ime $istories Pus#o)er cur)es
Performance &imit States
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Capacity of structure
• Static puso)erAnalysis
• Capacity cur)es :Base
sear Vs .oof drift;obtained
• Con)ersion intoA:Acceleration
isplacement; formby forming e-ui)alentS8< system =CAPAC(3 (A6.AM
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Capacity of structure
B a s e
s e a r
rift
S a
S d
3i
3f
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Set of accelerogram used on te e-ui)alentS8< system5
Elastic spectra !it constant damping is
formed5Con)erted into A format for ne7t step of
Structural assessment !it te capacity Aformat5
emand of 6round motion
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emand :contd5>;
.esponse Spectrum
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• Basic portion of te .isk assessment process
• Ad)anced capacity Spectrum :?; metod isused5
= nonlinear ? = t!o displacement sets
• ? is performance based design tecni-uene7t to"
15 Capacity spectrum ## A3C 40
?5 on linear static procedure :SP; = (nelastic spectra is used
rater tan te elastic spectra5
Structural Assessment
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8utline of CSM
CSM
Capacity
(nput
6roundmotion:demand;
isplacement.esponse data
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CSM = ? Metod
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Capacity diagram of e-ui)alent S8< is transferred into Bilinearcur)e5
isplacement * strengt at te yield location is determined5
Elastic period :3; is calculated> !ic is te point ofintersection of te elastic spectra !it tat radial line5
ield point is assumed based on
e-ual energy principle upto plastic
mecanism5
Bilinear 3ransformation of Capacity iagram
ield
point
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(nelastic spectra
By E-ual displacement rule> elastic
Spectra is con)erted into inelastic
Spectra as>
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3
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3ese performance points for respecti)ebuilding in)entory class is plotted in a grap *regression analysis is done on te scatter
(ts output is statistically analy%ed in asuitable distribution * te Probabilistic pointsare plotted on te grap against te 6roundmotion inde7
Performance isplacements
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• Pus#o)er cur)e is de)eloped5• Masonry bea)ior * its failure patterns are
studied !ell from te te7tbooks * 3.EM2.(guidelines5
• an E7celseet is de)eloped Spectral acceleration canbe calculated using appro7imation metods5
•
SE(SM8S3.2C3> is practiced for de)elopingPus#o)er cur)es5
Dork done
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Building Plan
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3.EM2.( Soft!are * 8utputs
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Pus#o)er cur)e
0 0 0 0501 0501 0501 0501 0501 050?
0
10
1
?0
?
@0
@
Push-over curve
storey drift (m)
Base shear
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Scedule of Dork
Activities
Schedule
DEC ‘12 JAN ‘13 FEB ‘13 MAR ‘13 APRIL ‘13
Classification and modeling of building
inventory
Push-over & Time history Analysis ofdatabase
Structural Assessment process by CSM
Probabilistic Damage model for the database
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Cal)i 65> Pino .5> Magenes 65> Bommer 9595> .estrepo &5< and Cro!ley$5 :?00; e)elopment of seismic )ulnerability assessment
metodologies o)er te past @0 yearsF> ISET Journal of Earthua!eTechnology" 4@ :@;> pp5 +#1045
6encturk B5 and Elnasai A5S5 :?01?; Simulation#basedfragility relationsips for 2nreinforced masonry buildingsF> Journal ofStructural Engineering5 105101
P5 :?000;5FA onlinear Analysis metod for performance based
designF5 EE#I" Earthua!e $pectra" 1 :@;> pp5 +@#H?6encturk> B5 and Elnasai> A5S5 :?00I; e)elopment and application
of an ad)anced capacity spectrum metodF> Engineering Structure$"@0> pp5 @@4#@@4
(S 4@? :?00@; Code of Practices for Eart-uake .esistant designand construction PracticesF> %ureau of Indian Standard$
Federal Emergency Management &gency
Federal Emergency Management &gency
.eferences