seismic vulnerability of building stocks.pptx

8/18/2019 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

seismic vulnerability of building stocks.pptx

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