EGU

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EGU Vienna 2007

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EGU

  1. 1. Impact of seismic retrofit on interwar RC housing Maria BOSTENARU Rui PINHO ROSE School, Pavia, Italy
  2. 2. Overview  Introduction  Modelling of interwar housing buildings  Earthquake behaviour of interwar buildings  Retrofit, and discussion of the impact of such measures  Optimisation of a retrofit measure  Conclusions
  3. 3. Modelling of interwar housing buildings  The IVth CIAM in 1933 in Athens and architectural characteristics of historic RC housing buildings in earthquake prone parts of Europe  Structural characteristics
  4. 4. Modern buildings in Greece
  5. 5. Bedroom / night zone Living room, including dinning Corridors / circulation zone Bathrooms, toillets Kitchen Hall / vertical circulation Deposit / external circulation Legend: Functional scheme in a Greek apartment building
  6. 6. Modern buildings in Romania
  7. 7. Functional scheme in a Romanian apartment building Bedroom / night zone Living room, including dinning Corridors / circulation zone Bathrooms, toillets Kitchen Hall / vertical circulation Deposit / external circulation Legend:
  8. 8. Architectural typology Bedroom / night zone Living room, including dinning Corridors / circulation zone Bathrooms, toillets Kitchen Hall / vertical circulation Deposit / external circulation Legend: 1. 2. 3.
  9. 9. Modern buildings in Portugal
  10. 10. Earthquake behaviour of interwar buildings  Design of a model of an interwar building  Effects of earthquakes on the structure
  11. 11. Model building: facade and section
  12. 12. Model building: plan of the current floor
  13. 13. Model building: plans of GF, basement and set-back floors
  14. 14. Material models for concrete and steel
  15. 15. Slab modeling
  16. 16. Section models
  17. 17. Finite elements model of the building
  18. 18. Pushover curves pushover X 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 0 50 100 150 200 250 300 350 400 Displacement N6206 (mm) Baseshear(kN) Base Shear X Base Shear X negative pushover Y 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 0 50 100 150 200 250 300 350 400 Displacement N6206 (mm) Baseshear(kN) Base Shear Y Base Shear Y negative
  19. 19. Retrofit, and discussion of the impact of such measures  Design of the retrofit measure  Impact of the measure
  20. 20. Layout of retrofit elements 1st phase: soft storey 2nd phase 3rd phase
  21. 21. Retrofit options pushover X 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 0 50 100 150 200 250 Displacement N6206 (mm) Baseshear(kN) Base Shear X Base Shear X retrofit2 Base Shear X retrofit 3 pushover Y 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 -15 35 85 135 185 235 285 335 Displacement N6206 Baseshear(N) Base Shear Y Base Shear Y retrofit2 Base Shear Y retrofit3
  22. 22. Deformed shapes
  23. 23. Most damaged elements yield and spall GF most damaged upper floor columns Vrancea earthquake 1986 yield 1st floor yield, spall GF yield, spall, crush GF yield GF most damaged transversal beams Vrancea earthquake 1986 yield in GF beams yield, crush in GF beams yield, spall, crush in GF beams most damaged longitudinal beams Vrancea earthquake 1986 crush, spall, yield GF spall GF yield 1st floor yield GF spall 1st floor most damaged upper floor columns Vrancea earthquake 1977 most damaged GF columns (also break) Vrancea earthquake 1977 yield in beams over basement spall in beams over basement yield in beams over 1st and 2nd floor most damaged longitudinal beams Vrancea earthquake 1977 . yield GF yield, spall GF most damaged beams Thessaloniki earthquake 1978 yield GF yield, spall GF most damaged longitudinal beams Vrancea earthquake 1990
  24. 24. Optimisation of a retrofit measure  Optimisation of impact parameters  Re-assessment of the impact
  25. 25. Pushover curves X 0 0,05 0,1 0,15 0,2 0,25 0 20 40 60 80 100 120 140 160 displacement (mm) acceleration(g) unretrofitted 94 retrofitted negative 0,192 Y 0 0,05 0,1 0,15 0,2 0,25 0 50 100 150 200 displacement (mm) acceleration(g) unretrofitted retrofitted 103 negative 0.192
  26. 26. Decision tree Historical Building Element Material Vulnerability Structure performance Retrofit elements Strategy Architect Engineer Inhabitant Investor Execution Acceptance Occupancy Management Availability Indicators Residential value Reversibility Guidelines Displacement, maximal Tension Facade Interior space Structure Demolition Size change Looks change Construction material change Material Earthquake Shape score Structure score Forces Displacement, remaining Element replacement New element Non-structural > structural System completion Strengthening/Stiffening Enhanced ductility Reduced demand Duration Noise Relocation Participation Ownership form Safety Own expenses Other benefits During measure After measure After earthquake Total costs/New bldg. – 30% Aggregate Building site Phases Repeatability Construction material versus Technology versus Funds Relocation space Reparation/New building Retrofit/New building Reparation saving/Retrofit Compatibility with old Conservation of old Maintenance new Sustainability Partial demolition
  27. 27. Detail of the model building
  28. 28. Geo-composite yarn weaving
  29. 29. Conclusions
  30. 30. Thank you! Questions?

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