SCENARIO DAMAGE ANALYSIS OF RC PRECAST INDUSTRIAL STRUCTURES IN TUSCANY, ITALY
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Transcript of SCENARIO DAMAGE ANALYSIS OF RC PRECAST INDUSTRIAL STRUCTURES IN TUSCANY, ITALY
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SCENARIO DAMAGE ANALYSIS OF RC PRECAST
INDUSTRIAL STRUCTURES IN TUSCANY, ITALY
Chiara Casotto, Vitor Silva, Helen Crowley, Rui Pinho, Roberto Nascimbene
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24 fatalities, 400 injured, 20,000 homeless, $12.4B losses
Beam-column joint
Emilia Romagna Earthquake 2012: why are losses so high for such a small earthquake (5.9 Mw)?
Belleri et al. (2013)
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Adana-Ceyhan (1998), Kocaeli (1999) and Duzce (1999)
60% of the industrial facilities suffered substantial damage
High ductility demand due to fixed-base crown-hinged structural scheme, and by the high inter-storey height
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Damage scenario for Tuscany
EXPOSURE FRAGILITY HAZARD
Single fault rupture from Basili et al.
(2008)
Fragility curvesInventory industrial building databasefrom Ferrini et al.
(2007)
FRAGILITY
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Random sampling of properties
Generation of the single structure
Geometric and Material properties and their Probability Density
Functions
BUILDING STOCK GENERATION
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Random sampling of properties
Generation of the single structure
Dynamic Analyses
Storage of the damage level
enough samplings?
No
Definition of the damageLimit state
Geometric and Material properties and their Probability Density
Functions
DESIGN, MODELLING, ANALYSES
Yes
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Regression analysis with damage data
Fragility curves
Yes
Random sampling of properties
Generation of the single structure
Dynamic Analyses
Storage of the damage level
enough samplings?
No
Geometric and Material properties and their Probability Density
Functions
FRAGILITY CURVE DERIVATION
Definition of the damageLimit state
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Building population classification
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How to represent the Italian industrial building population?
Statistical data from 649 industrial buildings inspected in Emilia Romagna and Tuscany
Type 1 Type 2
Half of the structures were not designed to seismic loads
Post-Classification
Pre-Classification
Post-Seismic Code
Pre-Seismic Code
Type 1 - Beam Length [m]
Den
sity
Type 2 - Beam Length [m]
Den
sity
Data collected by the Seismic Risk Prevention Area of Tuscany Region and Structural Analysis Section of Eucentre
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Pushover analysis and Limit State definition
Dynamic analyses and damage states allocation
Input in X
c ab
c
70 records used
Analysis process
a
b
Repeat the process for the entire building population (100 frames)
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Analyses results
Data fitted with a lognormal curve using with Maximum Likelihood EstimateR is the correlation coefficient: measure of the correlation between data and curve
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VFR friction resistance, a friction coefficient, N axial load
following Magliulo et al. (2011), Calvi et al.(2006)
Vcnn < Vshear,max
Pre-code Vcnn= VFR = a N
Low-code Vcnn= VFR + Vsteel Collapse limit state
How to take into account connection failure as a limit state?
N reduced by 40% to account for vertical acceleration
a = 0.1-0.5Analyses run with a = 0.2, a = 0.3
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PC = P(CollapseConnection) PConnection mechanism + P(CollapseFlexure)(1-PConnection mechanism)
How to account for connection collapse in regression analysis?
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• Very sensitive to friction coefficient• Better estimate of the axial load reduction
a = 0.2 a = 0.3
Dynamic analysis with Vertical acceleration
How much the friction coefficient influence the results?
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Connection failure with vertical acceleration
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Flexural Collapse only Flexural and Connection Collapse
a = 0.2 median b R2 a = 0.2 median b R2
LS1 70.8 0.55 0.9 LS2 218.7 0.59 0.83
How much connection collapse affect the probability of collapse?
Type T1-LC-4 Topt = 1.8 s
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Groundmotion
realisations
3 damage staterealisations
Damage scenario calculation with OpenQuake
Single rupture
Fragility model
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Collapse estimates for a scenario Mw = 6.5 in Tuscany
M=6.5
0.0240.060.10.20.3
km
2000 ground motion fields for rock soil
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slightmoderate
collapse
Collapse estimates for a scenario Mw = 6.5 in Tuscany
km
Thank you
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Except where otherwise noted, this work is licensed under: creativecommons.org/licenses/by-nc-nd/4.0/
Please attribute to the GEM Foundation with a link to - www.globalearthquakemodel.org