Multi hazard approach to design of civil structures
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Multi hazard approach to design of civil structures April 29 th 2010 Multi hazard approach to design of civil structures Domenico Asprone Dipartimento di Ingegneria Strutturale Università degli Studi di Napoli Federico II
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Multi hazard approach to design of civil structures. Domenico Asprone Dipartimento di Ingegneria Strutturale Università degli Studi di Napoli Federico II. Introduction. A strategic structure could be subject to more than one critical action during its service life. - PowerPoint PPT Presentation
Transcript of Multi hazard approach to design of civil structures
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Multi hazard approach to design of civil structures
Domenico Asprone
Dipartimento di Ingegneria StrutturaleUniversità degli Studi di Napoli Federico II
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A strategic structure could be subject to more than one critical action during its service life.
A sustainable design needs to consider all the possible critical actions which the structure could be subjected to.
Given the uncertainty involved, the sustainable design needs to be addressed based on a probabilistic framework.
Introduction
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Risk, hazard, vulnerability and exposure are probabilistic quantities.
R E V H
risk exposure vulnerability hazard
Multi-hazard structural design/assessment
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sAp
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(a)
(a)
(b)
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sAp
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Vulnerability
Seismic vulnerability
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Vulnerability
Non-structural elements vulnerability
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Vulnerability
Tsunami vulnerability
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Vulnerability
Termite vulnerability
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Exposure
Time dependence
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Exposure
Seismic zones
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Multi-hazard structural design/assessment
Structural engineering issue:In case of multiple hazard, the design/assessment criterion can be written as
( | ) ( | ) ( | ) ...C EQ wind Blast dmP C EQ P C Wind P C Blast
Total probability of collapse
Acceptable threshold
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Italian hazardfor civil structures
• Earthquake;• Extreme service conditions;• Wind;• Snow;• Explosions;• Fire;• Flood;• Landslide; • Vulcan eruptions;• …
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Seismic hazard
Peak Ground Acceleration
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Seismic hazard
36 Seismogenic zones
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Seismic hazard
Attenuation law
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Seismic hazard
PGA distribution
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Seismic hazard
Grid spacing 0.05° long-lat
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Seismic hazard
Pratica di Mare hazard
Return Period PGALimit states
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Man-made blast hazardScenario definition
30% 70%
Explosion takes place inside the structure Explosion takes place outside a 10 m stand-off distance from the structure
10% 90%
Truck bomb W=15,000kg - 25,000kg
Car bomb W=200 kg - 500kg
20% 20% 20% 20% 20%
1st floor: Car bomb W=200 kg – 500 kg
2nd floor: Backpack bomb W=15 kg – 35 kg
3rd floor: Backpack bomb W=15 kg – 35 kg
4th floor: Backpack bomb W=15 kg – 35 kg
5th floor: Backpack bomb W=15 kg – 35 kg
Blast scenario
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Blast loading
The induced overpressure normally consists of a positive decaying phase followed by a weaker negative phase.The most critical aspect with respect to the safety of the structure regards progressive collapse mechanisms on the damaged structure.
-200
-100
0
100
200
300
400
500
0 0.005 0.01 0.015 0.02
t [s]
P [
Mp
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Blast Scenarios Leading to Collapse
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Wind hazardCritical issues:• Wind direction;• Low velocity
characterization;• Spatial mesh refining;• Season variation;• Reliable hazard
characterization.
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Multi-hazard structural design/assessment
Structural engineering issue:In case of multiple hazard, the design/assessment criterion can be written as
( | ) ( | ) ( | ) ...C EQ wind Blast dmP C EQ P C Wind P C Blast
Total probability of collapse
Acceptable threshold
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Thank you
