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Multi hazard approach to design of civil structures

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.

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Multi hazard approach to design of civil structures

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  1. Multi hazard approach to design of civil structures Domenico Asprone Dipartimento di Ingegneria Strutturale Università degli Studi di Napoli Federico II

  2. Introduction 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.

  3. Risk, hazard, vulnerability and exposure are probabilistic quantities. Multi-hazard structural design/assessment vulnerability risk exposure hazard

  4. Hazard (a) (a) (b)

  5. Hazard

  6. Hazard

  7. Vulnerability Seismic vulnerability

  8. Vulnerability Non-structural elements vulnerability

  9. Vulnerability Tsunami vulnerability

  10. Vulnerability Termite vulnerability

  11. Exposure Time dependence

  12. Exposure Seismic zones

  13. Multi-hazard structural design/assessment Structural engineering issue: In case of multiple hazard, the design/assessment criterion can be written as Acceptable threshold Total probability of collapse

  14. Italian hazardfor civil structures Earthquake; Extreme service conditions; Wind; Snow; Explosions; Fire; Flood; Landslide; Vulcan eruptions; …

  15. Seismic hazard Peak Ground Acceleration

  16. Seismic hazard 36 Seismogenic zones

  17. Seismic hazard Attenuation law

  18. Seismic hazard PGA distribution

  19. Seismic hazard Grid spacing 0.05° long-lat

  20. Seismic hazard Pratica di Mare hazard Limit states Return Period PGA

  21. Man-made blast hazardScenario definition Blast scenario 30% 70% Explosion takes place inside the structure Explosion takes place outside a 10 m stand-off distance from the structure 20% 20% 20% 20% 20% 10% 90% 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 Car bomb W=200 kg - 500kg Truck bomb W=15,000kg - 25,000kg

  22. 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.

  23. Blast Scenarios Leading to Collapse

  24. Wind hazard Critical issues: Wind direction; Low velocity characterization; Spatial mesh refining; Season variation; Reliable hazard characterization.

  25. Multi-hazard structural design/assessment Structural engineering issue: In case of multiple hazard, the design/assessment criterion can be written as Acceptable threshold Total probability of collapse

  26. Thank you

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