PSA - Caratteristiche del Fenomeno Incendio - Bontempi
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Transcript of PSA - Caratteristiche del Fenomeno Incendio - Bontempi

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PSA:CARATTERISTICHE
FENOMENO INCENDIO
Prof. Ing. Franco BontempiIng. Chiara Crosti
Facolta’ di Ingegneria Civile e IndustrialeUniversita’ degli Studi di Roma “La Sapienza”
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INCENDIO
• Incendio = combustione autoalimentata ed incontrollata di materiali combustibili.
• Carattere estensivo (diffusione nello spazio):
1. wildfire
2. urbanfire
3. all’esterno di un edificio
4. all’interno di un interno
• Carattere intensivo (andamento nel tempo).
• Natura accidentale.
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CARATTERE ESTENSIVODiffusione nello spazio
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1. WILDFIREwww.francobontempi.
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2. URBANFIREwww.francobontempi.
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The Great Fire of London Sunday, 2 September to Wednesday, 5 September 1666.
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The Great Fire of the City of New York, 16 December 1835
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The Great Fire of Chicago, October 7-10, 1871www.francobontempi.
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3. ALL’ESTERNO DI UN EDIFICIOwww.francobontempi.
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4. ALL’INTERNO DI UN EDIFICIOwww.francobontempi.
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NUMERICALMODELING
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CARATTERE INTENSIVOAndamento temporale
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ISO 13387: Example of Design Firewww.francobontempi.
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www.francobontempi.orgEVOLUZIONE NEL TEMPO DELLA
POTENZA TERMICA
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Summary of periods of typical fire development
Incipient period
Growth period Burning period Decay period
Fire Behavior
Heating of fuel
Fuel controlled burning Ventilation controlled burning
Fuel controlled burning
Human behavior
Prevent ignition
Extinguish by hand, escape
Death
Detection Smoke detectors
Smoke detectors, heat detectors
External smoke and flame
Active control
Prevent ignition
Extinguish by sprinklers or fire fighters; control of smoke
Control by fire-fighters
Passive control
- Select materials with resistance to flame spread
Provide fire resistance; contain fire, prevent collapse
T
timeBuchanan, 2002
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flash
ove
r
STRATEGIEATTIVE
(approcciosistemico)
STRATEGIEPASSIVE(approcciostrutturale)
Tempo t
Te
mp
era
tura
T(t
)
andamento di T(t) aseguito del successodelle strategie attive
flash
ove
r
STRATEGIEATTIVE
(approcciosistemico)
STRATEGIEPASSIVE(approcciostrutturale)
Tempo t
Te
mp
era
tura
T(t
)
andamento di T(t) aseguito del successodelle strategie attive
FIRE MODEL
HEAT TRANSFER MODEL
STRUCTURAL MODEL
Fire thermal exposure
Thermal gradients
Load capacity
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FLASHOVER
passive
Create fire compartments
Prevent damage in the elements
Prevent loss of functionality in the building
active
Detection measures(smoke, heat, flame detectors)
Suppression measures (sprinklers, fire extinguisher, standpipes, firemen)
Smoke and heat evacuation system
prevention protection robustness
Limit ignitionsources
Limit hazardous human behavior
Emergency procedure and evacuation
Prevent the propagation of collapse, once local damages occurred (e.g. redundancy)
Fire Safety Strategies
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Fire Safety Strategies
activeprotection
passiveprotection
no failures
doesn’t trigger
Y
N
Y
N
spreads
extinguishes
damages
Y
N
robustness
no collapse
collapse
Y
N
triggers
prevention
1 42 3
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CARATTERE ACCIDENTALEEvento
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DO
I: 1
0.3
26
7/H
E20
08
Situazioni HPLC
High Probability Low Consequences
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LPHC events www.francobontempi.org
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HPLCHigh probability
Low Consequences
LPHCLow Probability
High Consequences
release of energy SMALL LARGE
numbers of breakdown SMALL LARGE
people involved FEW MANY
nonlinearity WEAK STRONG
interactions WEAK STRONG
uncertainty WEAK STRONG
decomposability HIGH LOW
course predictability HIGH LOW
HPLC – LPHC EVENTS www.francobontempi.org
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Pe
rro
w
LINEAR interactions NONLINEAR
LOO
SE
co
up
lings
TIG
HT
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LOW
AMBIGUITY UNCERTAINTY
HIGH
TIGHT
COUPLING INTERACTIONS CONNECTIONS
LOOSE
NON LINEAR
BEHAVIOR
LINEAR
LOW
AMBIGUITY UNCERTAINTY
HIGH
TIGHT
COUPLING INTERACTIONS CONNECTIONS
LOOSE
NON LINEAR
BEHAVIOR
LINEAR
Complexity

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3300183 183777 627
+77.00 m
+383.00 +383.00
+54.00+118.00
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3300183 183777 627
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+383.00 +383.00
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CONTROL DEVICES
SOIL BEHAVIORMATERIAL NONLINEARITY
SOIL/STRUCTURE INTERFACE CONTACT
HANGERS
TOWERS
MAIN CABLES
GEOMETRIC NONLINEARITY
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3300183 183777 627
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STRUCTURAL MODEL
LOADING SYSTEM
GEOMETRY AND MATERIAL
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TRAFFIC – STRUCTURE
WIND - STRUCTURE
SOIL - STRUCTURE
Interactions
GLOBAL/LOCAL STRUCTURAL BEHAVIOUR
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DO
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26
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Approcci di analisi
HPLCEventi Frequenti con
Conseguenze Limitate
LPHCEventi Rari con
Conseguenze Elevate
Complessità:Aspetti non lineari e
Meccanismi di interazioni
Impostazionedel problema:
Deterministico
Stocastico
ANALISIQUALITATIVA
DETERMINISTICA
ANALISIQUANTITATIVA
PROBABILISTICA
ANALISIPRAGMATICACON SCENARI
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Scenari (D.M. 14 settembre 2005)
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Il Progettista, a seguito della classificazione e della caratterizzazione delle azioni,
deve individuare le possibili situazioni contingenti in cui le azioni possono
cimentare l’opera stessa. A tal fine, è definito:
lo scenario: un insieme organizzato e realistico di situazioni in cui l’opera
potrà trovarsi durante la vita utile di progetto;
lo scenario di carico: un insieme organizzato e realistico di azioni che
cimentano la struttura;
lo scenario di contingenza: l’identificazione di uno stato plausibile e
coerente per l’opera, in cui un insieme di azioni (scenario di carico) è
applicato su una configurazione strutturale.
Per ciascuno stato limite considerato devono essere individuati scenari di carico
(ovvero insiemi organizzati e coerenti nello spazio e nel tempo di azioni) che
rappresentino le combinazioni delle azioni realisticamente possibili e
verosimilmente più restrittive.
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Overview of scenario analysisDetermine geometry,
construction and use of the building
Establish maximum likely fuel loads
Estimate maximum likely number of occupants
and their locations
Assume certain fire protection features
Carry out fire engineering analysis
Acceptable performance
Accept design
Modify fire protection features
Establish performance requirements
No Yes
Buch
anan,
2002
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ISO 13387: Example of Event Tree
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CONTROLLING FIRE SPREAD
• The larger a fire, the greater its destructive potential.
• The control of fire movement, or fire spread, is discussed in four categories:
1. within the room of origin;
2. to other rooms on the same level;
3. to other storey of the same building;
4. to other buildings.
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ISO 13387: Examples of Fire Spread Routes
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Fire spread within the room of origin
• Fire spread within the room of origin depends largely on heat release rate of the initially burning object.
• Vertical and horizontal fire spread will be greatly increased if the room is lined with combustible materials susceptible to rapid flame spread on the walls and especially on the ceilings.
• The properties of interest are ignitability, flame spread and the amount of smoke produced; these are often called early fire hazard properties or reaction to fire properties; these properties can be improved with the use of special paints or pressure treatment.
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Fire spread to adjacent rooms (1)
• Spread of fire and smoke to adjacent rooms is a major contributor to fire deaths. Fire and smoke movement depends vey much on the geometry of the building. If doors are open, they can provide a path for smoke and toxic combustion products to travel from the upper layer of the fire room into the next room or corridor.
• Keeping doors closed is essential to preventing fire spread from room to room. Doors through fire barrier must be able to maintain the containment function of the barrier through which they pass, whether for smoke control or fire resistance.
• Door closing devices which operate automatically when a fire is detected are very effective for greatly increasing fire safety.
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Fire spread to adjacent rooms (2)
• Concealed spaces are one of the most dangerous paths for the spread f fire and smoke. Concealed cavities are a particular problem in old buildings, especially if a number of new ceilings or partitions have been added over the years.
• Fire can also spread to adjacent rooms by penetrating the surrounding walls. Fire resisting walls must extend through suspended ceilings to the floor or roof above so that the fire does not spread by traveling through concealed space above the wall.
• The wall can be extended above the roof line to form a parapet, or the roof can be fire-rated for some distance either side of the top of the wall.
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Fire spread to others storey (1)• Vertical shafts and stairways must be fire-stopped or separated
from the occupied space at each level to avoid producing a path for spread of fire and smoke from floor to floor. A particularly dangerous situation can arise if there are interconnected horizontal and vertical concealed spaces, within the building or on the façade.
• This is particularly important of curtain-wall construction where the exterior panels are not part of the structure. Careful detailing and installation is necessary to ensure that the entire gap is sealed, especially at corners and junctions, to eliminate any possible path for fire spread.
• Gaps such as these between structural and non-structural elements are often filed with non-rigid fire-stopping materials to allow for seismic or thermal movement.
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Fire spread to others storey (2)• Vertical fire spread can also occur outside the building
envelope, via combustible cladding materials or exterior windows.
• Vertical spread of fire from window is a major hazard in multi-story buildings. This hazard can be partly controlled by keeping windows small and well separated, and by using horizontal aprons which project above windows openings.
• Flames from small narrow windows tend to project further away from the wall of the building than flames from long wide windows, leading to lower probability of storey fire spread.
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Fire spread to other buildings• Fire can spread from a burning building to adjacent buildings by
flame contact, by radiation from windows, or by flaming brands.
• Fire spread can be prevented by providing a fire-resisting barrier or by providing sufficient separation distances. If there are openings in the external wall, the probability of fire spread depends greatly on the distances between the buildings and the size of the openings. It depends also on relative buildings heights.
• Collapse of exterior walls can be a major hazard for fire-fighters and bystanders, and can lead to further spread of fire to adjacent buildings.
• Fire spread by flame contact is only possible if the buildings are quite close together, whereas fire spread by radiation can occur over many meters. Fire can also travel large distances between buildings if combustible vegetation is present.
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IMPOSTAZIONE DELLA SICUREZZARischio
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RISK CONCERNw
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RISKRISCHIO
HAZARD
PERICOLO
EXPOSURE
ESPOSIZIONE
VULNERABILITY
VULNERABLITA'
CONSEQUENCES
CONSEGUENZE
ENVIRONMENT
AMBIENTE
(sidewalkmarciapiede)
SYSTEM
SISTEMA
(walking personpedone)
(hole
tombino)
(path
percorso)
(distraction
distrazione)
June 2011 78www.francobontempi.org
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Risk treatment
Option 1 :RISK
AVOIDANCE
Option 2 :RISK
REDUCTION
Option 3 :
RISK TRANSFER
Option 4 :RISK
ACCEPTANCE
START
STOP
No
No
No
Yes
Yes
Yes
No
100 %
50 %
50 %
30 %
20 %
25 %
5 %
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Option 1 – Risk avoidance, which usually means not proceeding to continue with the system; this is not always a feasible option, but may be the only course of action if the hazard or their probability of occurrence or both are particularly serious;
Option 2 – Risk reduction, either through (a) reducing the probability of occurrence of some events, or (b) through reduction in the severity of the consequences, such as downsizing the system, or (c) putting in place control measures;
Option 3 – Risk transfer, where insurance or other financial mechanisms can be put in place to share or completely transfer the financial risk to other parties; this is not a feasible option where the primary consequences are not financial;
Option 4 – Risk acceptance, even when it exceeds the criteria, but perhaps only for a limited time until other measures can be taken.
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Risk Analysis, Assessment, Management (IEC 1995)
Luur, 2
002
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Quantitative Risk Analysis
Luur, 2
002
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Risk-based decision makingDEFINE CONTEXT(social, individual,
political, organizational,technological)
DEFINE SYSTEM(the system is usually decomposed into a
number of smaller subsystems and/or components)
HAZARD SCENARIO ANALYSIS(what can go wrong?how can it happen?waht controls exist?)
ESTIMATE PROBABILITIES(of occurrences)
ESTIMATE CONSEQUENCES
(magnitude)
DEFINE RISK SCENARIOS
RISK ASSESSMENT(compare risks against criteria)
RISK TREATMENT option 1 - avoidance option 2 - reduction option 3 - transfer option 4 - acceptance
SENSITIVITY ANALYSIS
MONITORAND
REVIEW
Ste
wart
& M
elc
hers
, 1997
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RISK CONCERNSDEFINE CONTEXT
(social, individual, political, organizational,
technological)
RSK ANALYSIS
(for the system are defined organization, scenarios, and consequences of
occurences)
RISK ASSESSMENT(compare risks
against criteria)
RISK TREATMENT
option 1 - avoidance option 2 - reduction
option 3 - transfer
option 4 - acceptance
MONITORAND
REVIEW
RISKMANAGEMENT
RISKANALYSIS
RISKASSESSMENT
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RISK CONCERNSDEFINE CONTEXT
(social, individual, political, organizational,
technological)
RSK ANALYSIS
(for the system are defined organization, scenarios, and consequences of
occurences)
RISK ASSESSMENT(compare risks
against criteria)
RISK TREATMENT
option 1 - avoidance option 2 - reduction
option 3 - transfer
option 4 - acceptance
MONITORAND
REVIEW
RISKMANAGEMENT
RISKANALYSIS
RISKASSESSMENT
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RISK CONCERNSDEFINE CONTEXT
(social, individual, political, organizational,
technological)
RSK ANALYSIS
(for the system are defined organization, scenarios, and consequences of
occurences)
RISK ASSESSMENT(compare risks
against criteria)
RISK TREATMENT
option 1 - avoidance option 2 - reduction
option 3 - transfer
option 4 - acceptance
MONITORAND
REVIEW
RISKMANAGEMENT
RISKANALYSIS
RISKASSESSMENT
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RISK CONCERNSDEFINE CONTEXT
(social, individual, political, organizational,
technological)
RSK ANALYSIS
(for the system are defined organization, scenarios, and consequences of
occurences)
RISK ASSESSMENT(compare risks
against criteria)
RISK TREATMENT
option 1 - avoidance option 2 - reduction
option 3 - transfer
option 4 - acceptance
MONITORAND
REVIEW
RISKMANAGEMENT
RISKANALYSIS
RISKASSESSMENT
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RISK CONCERNSDEFINE CONTEXT
(social, individual, political, organizational,
technological)
RSK ANALYSIS
(for the system are defined organization, scenarios, and consequences of
occurences)
RISK ASSESSMENT(compare risks
against criteria)
RISK TREATMENT
option 1 - avoidance option 2 - reduction
option 3 - transfer
option 4 - acceptance
MONITORAND
REVIEW
RISKMANAGEMENT
RISKANALYSIS
RISKASSESSMENT
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RISK CONCERNSDEFINE CONTEXT
(social, individual, political, organizational,
technological)
RSK ANALYSIS
(for the system are defined organization, scenarios, and consequences of
occurences)
RISK ASSESSMENT(compare risks
against criteria)
RISK TREATMENT
option 1 - avoidance option 2 - reduction
option 3 - transfer
option 4 - acceptance
MONITORAND
REVIEW
RISKMANAGEMENT
RISKANALYSIS
RISKASSESSMENT
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RISK CONCERNSDEFINE CONTEXT
(social, individual, political, organizational,
technological)
RSK ANALYSIS
(for the system are defined organization, scenarios, and consequences of
occurences)
RISK ASSESSMENT(compare risks
against criteria)
RISK TREATMENT
option 1 - avoidance option 2 - reduction
option 3 - transfer
option 4 - acceptance
MONITORAND
REVIEW
RISKMANAGEMENT
RISKANALYSIS
RISKASSESSMENT
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91
RISK CONCERNSDEFINE CONTEXT
(social, individual, political, organizational,
technological)
RSK ANALYSIS
(for the system are defined organization, scenarios, and consequences of
occurences)
RISK ASSESSMENT(compare risks
against criteria)
RISK TREATMENT
option 1 - avoidance option 2 - reduction
option 3 - transfer
option 4 - acceptance
MONITORAND
REVIEW
RISKMANAGEMENT
RISKANALYSIS
RISKASSESSMENT
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Scenarios
DEFINE SYSTEM
(the system is usually decomposed into a number of smaller subsystems and/or
components)
HAZARD SCENARIO ANALYSIS
(what can go wrong?
how can it happen?waht controls exist?)
ESTIMATE
CONSEQUENCES(magnitude)
ESTIMATE
PROBABILITIES(of occurrences)
DEFINE RISK SCENARIOS
SENSITIVITY ANALYSIS
RISKANALYSIS
FIREEVENT
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Simulations
DEFINE SYSTEM
(the system is usually decomposed into a number of smaller subsystems and/or
components)
HAZARD SCENARIO ANALYSIS
(what can go wrong?
how can it happen?waht controls exist?)
ESTIMATE
CONSEQUENCES(magnitude)
ESTIMATE
PROBABILITIES(of occurrences)
DEFINE RISK SCENARIOS
SENSITIVITY ANALYSIS
RISKANALYSIS
NUMERICALMODELING
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95
Fire safety concepts tree (NFPA)1
2
3
4
5
6
7
8
9
Buch
anan,
2002
Strategie per
la gestionedell'incendio
1
Prevenzione
2
Gestione
dell'evento
3
Gestionedell'incendio
4Gestione delle
persone e
dei beni
15
Difesa sul posto16
Spostamento17
Disposibilitàdelle vie di fuga
18
Far avvenireil deflusso
19
Controllo della quantità
di
combustibile
5
Soppressionedell'incendio
10Controllo
dell'incendioattraverso il
progetto
13
Automatica11
Manuale12
Controllo deimateriali
presenti
6Controllo
del movimento
dell'incendio
7Resistenza e
stabilità
strutturale
14
Contenimento9
Ventilazione8
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Fire safety concepts tree (NFPA)
Buch
anan,
2002
1
2
3
4
5
6
7
8
9
Strategie perla gestione
dell'incendio
1
Prevenzione
2
Gestione
dell'evento
3
Gestionedell'incendio
4Gestione delle
persone edei beni
15
Difesa sul posto16
Spostamento17
Disposibilità
delle vie di fuga
18
Far avvenireil deflusso
19
Controllo della quantità
di combustibile
5
Soppressionedell'incendio
10Controllo
dell'incendioattraverso il
progetto
13
Automatica11
Manuale12
Controllo dei
materialipresenti
6Controllo
del movimentodell'incendio
7Resistenza e
stabilitàstrutturale
14
Contenimento9
Ventilazione8
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FIRE SAFETY CONCEPTS TREE (NFPA)
Line 2
• La gestione dell’incendio non è necessaria se si previene l’ignizione.
• Può essere solo ridotta la probabilità che avvenga l’ignizione.
• Gli incendi dolosi è difficile da prevedere dal progettista
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FIRE SAFETY CONCEPTS TREE (NFPA)
Line 4
Exposed persons and property can be managed by moving them from the building or
by defending them in place; in order for people to move, the fire must be detected,
the people must be notified, and there must be a suitable safe path for movement.
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Line 6
• There are three options for managing a fire; in the first case the fuel source can be controlled, by limiting the amount of fuel or the geometry; the second options is to suppress the fire; the third is to control the fire by construction.
• Control fire by construction it is necessary to both control the movement of the fire and provide the structural stability.
FIRE SAFETY CONCEPTS TREE (NFPA)
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Line 9 - The two strategies for controlling fire movement are:
a) fire venting: venting can be by an active system of mechanically operated vents, or a passive system that relies on the melting of plastic skylights; in either case, the increased ventilation may increase the local severity of the fire, but fire spread within the building and the overall thermal impact on the structure will be reduced;
b) containment of a fire to prevent spread is the principal tool of passive fire protection; preventing fire growing to a large size is ne of the most important components of a fire safety strategy; radiant spread of the fire to neighboring buildings must also be prevented, by limiting the size of openings in exterior walls;
Smoke containment can also controlled by venting or containment; pressurizations and smoke barriers can also used.
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Fire safety concepts tree (NFPA) (1)
• Line 4 – exposed persons and property can be managed by moving them from the building or by defending them in place; in order for people to move, the fire must be detected, the people must be notified, and there must be a suitable safe path for movement.
• Line 6 – there are three options for managing a fire; in the first case the fuel source ca be controlled, by limiting the amount of fuel or the geometry; the second options is to suppress the fire; the third is to control the fire by construction.
• Control fire by construction it is necessary to both control the movement of the fire and provide the structural stability.
Buch
anan,
2002
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Fire safety concepts tree (NFPA) (2)• Line 9 - the two strategies for controlling fire movement are:
a) fire venting: venting can be by an active system of mechanically operated vents, or a passive system that relies on the meltig of plastic skylights; in either case, the increased ventilation may increase the local severity of the fire, but fire spread within the building and the overall thermal impact on the structure will be reduced;
b) containment of a fire to prevent spread is the principal tool of passive fire protection; preventing fire growing to a large size is ne of the most important components of a fire safety strategy; radiant spread of the fire to nighbouring buildings must also be prevented, by limiting the size of openings in exterior walls;
Smoke containment can also controlled by venting or containment; pressurizations and smoke barriers can also used.
Buch
anan,
2002
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Design Process - ISO 13387
A. Design constraints and possibilities (blue),
B. Action definition and development
(red),
C. Passive system and active response(yellow),
D. Safety and performance
(purple).
1033/22/2011
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SS0a
PRESCRIBEDDESIGN
PARAMETERS
SS0bESTIMATED
DESIGN
PARAMETERS
SS1initiation and
developmentof fire and
fire efluent
SS2movement of
fire effluent
SS3
structural response and fire spread
beyond enclosureof origin
SS4
detection,
activitation andsuppression
SS5
life safety:occupant behavior,
location andcondition
SS6
propertyloss
SS7business
interruption
SS8contamination
of
environment
SS9
destruction
ofheritage
(0)
DESIGNCONSTRAINTS
AND
POSSIBILITIES
(1+2)ACTION
DEFINITION
ANDDEVELOPMENT
(3+4)
SYSTEMPASSIVE
AND ACTIVERESPONSE
BU
S O
F I
NF
OR
MA
TIO
N
RESULTS
DESIGN
ACTION
RESPONSE
SA
FE
TY
& P
ER
FO
RM
AN
CE
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STRUCTURAL
CONCEPTION
STRUCTURAL TOPOLOGY
&
GEOMETRY
threats
No
Yes
threats
STRUCTURALMATERIAL
& PARTS
No
Yespassive structural
characteristics
threats
FIRE DETECTION
& SUPPRESSION
No
Yes
active structural
characteristics
threats
ORGANIZATION &
FIREFIGHTERS
No
Yes
threats
MAINTENANCE& USE
No
Yes
threats
No
alivestructural
characteristics
Yes
STRUCTURAL SYSTEM
CHARACTERISTICS
STRUCTURALSYSTEM
WEAKNESS
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STRUCTURAL
CONCEPTION
STRUCTURAL TOPOLOGY
&
GEOMETRY
threats
No
Yes
threats
STRUCTURALMATERIAL
& PARTS
No
Yespassive structural
characteristics
threats
No
Yes
STRUCTURAL CONCEPTION
STRUCTURAL TOPOLOGY
&
GEOMETRY
threats
No
Yes
threats
STRUCTURALMATERIAL
& PARTS
No
Yespassive
structural
characteristics
threats
FIRE DETECTION
& SUPPRESSION
No
Yes
active
structural characteristics
threats
ORGANIZATION & FIREFIGHTERS
No
Yes
threats
MAINTENANCE
& USE
No
Yes
threats
No
alivestructural
characteristics
Yes
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FIRE DETECTION
& SUPPRESSION
No
active structural
characteristics
threats
ORGANIZATION &
FIREFIGHTERS
No
Yes
threats
MAINTENANCE& USE
No
Yes
threats
No
alivestructural
characteristics
Yes
STRUCTURAL CONCEPTION
STRUCTURAL TOPOLOGY
&
GEOMETRY
threats
No
Yes
threats
STRUCTURALMATERIAL
& PARTS
No
Yespassive
structural
characteristics
threats
FIRE DETECTION
& SUPPRESSION
No
Yes
active
structural characteristics
threats
ORGANIZATION & FIREFIGHTERS
No
Yes
threats
MAINTENANCE
& USE
No
Yes
threats
No
alivestructural
characteristics
Yes
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STRUCTURAL
CONCEPTION
STRUCTURAL
TOPOLOGY&
GEOMETRY
STRUCTURAL
MATERIAL& PARTS
FIRE DETECTION& SUPPRESSION
ORGANIZATION & FIREFIGHTERS
MAINTENANCE
& USE
CRISIS
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HAZARD
IN-D
EPTH
DEFE
NCE
HOLES DUE TOACTIVE ERRORS
HOLES DUE TOHIDDEN ERRORS
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Causes of system failure
100%
Time
% o
f fa
ilure
Unknown phenomena
Known phenomena
Research level Design code level
past present future
A
BB B
C
Hu
man
err
ors
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112
StroNGER S.r.l. Research Spin-off for Structures of the Next Generation
Energy Harvesting and Resilience
Rome – Athens – Milan – Nice Cote Azur
Sede operativa: Via Giacomo Peroni 442-444, Tecnopolo Tiburtino,
00131 Roma (ITALY) – [email protected]