UG_20090206_Taerwe
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Presentation of the contribution of the Department of Structural Engineering to the IWT SBO project on fire safety and explosion safety in car parks.

Presentation of the contribution of the Department of Structural Engineering to the IWT SBO project on fire safety and explosion safety in car parks.

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  • 1. Fundamental design approaches for improvement of the fire safety in car parks UGent: structural aspects Prof. dr. ir. Luc Taerwe Ir. arch. Emmanuel Annerel Magnel Laboratory for Concrete Research – Department of Structural Engineering
  • 2. Objectives of the project with respect to structural aspects • to develop advanced mechanical models for the structural behaviour of car park structures taking into account non-linear behaviour due to indirect actions in the accidental situations of fire and explosion • to develop a particular analysis of the punching shear problem in case of fire and explosions Magnel Laboratory for Concrete Research 2
  • 3. WP1: Determination of design parameters, scenarios and objectives Determination of design parameters for - large scale structural tests - numerical simulations of structural behaviour under fire and explosions This implies decisions on: - geometrical conditions, such as size, ceiling configurations, etc.; - performance conditions, such as fire scenarios and explosion scenarios. Magnel Laboratory for Concrete Research 3
  • 4. Column-slab connections Slab types Mushroom slabs (paddestoelvloeren) Flat slabs (vlakke plaatvloeren) Precast thin slabs with lattice girders (breedplaatvloeren of predallen) Magnel Laboratory for Concrete Research 4
  • 5. Parking structures in the city of Ghent Kouter Sint-Pietersplein Vrijdagsmarkt Zuid Sint-Michiels Magnel Laboratory for Concrete Research 5
  • 6. General classification of loads according to variation in time Permanent loads (G) P[G] = 1 δG ≅ 0 Live loads (Q) 0 < P[Q] < 1 δQ↑ Accidental loads (A) e.g. fire and explosions P[A] ≅ 0 A↑ Magnel Laboratory for Concrete Research
  • 7. WP4: Structural models The objectives of this work package are to develop - an appropriate methodology for the analysis and design of underground car park structures in case of fire in combination with explosions. - the analysis of structural members of car park structures for fire in combination with explosions, with emphasis on slab / column behaviour and on punching resistance; - protection measures from a structural point of view. Note: The choice is made not to include the extrapolation of the results obtained for elements, towards robustness analysis of a whole building structure. Moreover, the initially foreseen WP on masonry walls is also not considered in the present two year project. Magnel Laboratory for Concrete Research 7
  • 8. Task 4.1: Parametric analysis of structural members Het brandeffect: thermo-mechanisch model DIANA Temperatuur: - Thermische geleidbaarheid - Volumetrische specifieke warmtecapaciteit - Coefficiënt voor convectie en straling Mechanische acties: -Sterktedegradering staal/beton Vervormingen, bezwijkvorm -Effect van explosie? Implementeren als kortstondig optredende kracht Magnel Laboratory for Concrete Research 8
  • 9. Task 4.2: Connections Focus on - study of moment resisting connections between structural elements - analysis of the punching resistance in case of fire and fire in combination with explosions. Magnel Laboratory for Concrete Research 9
  • 10. Punching A : referentienazichtsdoorsnede B : referentienazichtsgebied Acont C : referentienazichtsomtrek u1 D : belast gebied rcont : straal van een andere nazichtsomtrek uout,ef : omtrek vanaf waar geen ponswapening meer nodig is Magnel Laboratory for Concrete Research
  • 11. Controle aan de omtrek van de kolom β VEd u0 volgens type kolom vEd = ≤ 0,5 ν fcd u0 d Bepaling uout,ef uout ,ef = β vEd /( vRd,c d) afstand uiteinde ponswapening tot uout Magnel Laboratory for Concrete Research
  • 12. Example Gretzenbach 2004 (CH) Fire of one parked car: 6 am Collapse of roof slab: 7.30 am (7 fire workers killed) Magnel Laboratory for Concrete Research 12
  • 13. Collapse is combination of mistakes during design and excution - thicknes of soil layer larger in reality than assumed in design - top reinforcement at lower level than planned - top of columns partly in slab Magnel Laboratory for Concrete Research 13
  • 14. Magnel Laboratory for Concrete Research 14
  • 15. Kolom-plaatverbindingen Problemen bij brand Thermische uitzetting Afschuifbreuken kolommen !! Magnel Laboratory for Concrete Research 15
  • 16. Kolom-plaatverbindingen Problemen bij brand Uitwendige vervormingsverhindering verschuiving van momentenlijn → toename steunpuntsmomenten Magnel Laboratory for Concrete Research 16
  • 17. Test program 1. Three full scale column – slab connections (Magnel Lab and Warringtonfire) 2. Blast tests on selected connection configurations (KMS) Objectives: - Influence of reinforcement configurations on failure modes - Elaboration of mechanical model for punching resistance Magnel Laboratory for Concrete Research 17
  • 18. WP5: Reliable design calculation methods WP8: Dissemination Magnel Laboratory for Concrete Research 18