Evolution  and  sustainability  of  in-situ  concrete  flat  slabs  in  office  buildings<br />INTRODUCTION     SUSTAINIBI...
Evolution  and  sustainability  of  in-situ  concrete  flat  slabs  in  office  buildings<br />INTRODUCTION     SUSTAINIBI...
Simpler and quicker construction
Reduces execution timeframe
Increases construction safety</li></ul>XXXVII   IAHS WORLD CONGRESS ON HOUSING.   Santander (Spain). 26-29  October 2010<b...
Evolution  and  sustainability  of  in-situ  concrete  flat  slabs  in  office  buildings<br />INTRODUCTION     SUSTAINIBI...
 Less foundation costs
 Longer spans are economic
Excellentvibration control</li></ul>XXXVII   IAHS WORLD CONGRESS ON HOUSING.   Santander (Spain). 26-29  October 2010<br /...
Evolution  and  sustainability  of  in-situ  concrete  flat  slabs  in  office  buildings<br />INTRODUCTION     SUSTAINIBI...
 Thinner slabs , lighter structures
 Reduction in rebar tonnage
 Reduced cracking and deflections
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Evolution and sustainability of in-situ concrete flat in office buildings

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XXXVII IAHS WORLD CONGRESS ON HOUSING. Oct-2010

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Evolution and sustainability of in-situ concrete flat in office buildings

  1. 1. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTS CONCLUSIONS<br />Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />Liébana, O.1; G. Pulido1, MD; Gómez Hermoso J. 2<br />1University of San Pablo CEU (Madrid)2University Politécnica de Madrid<br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  2. 2. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTSCONCLUSIONS<br />flat slabs in office buildings in Spain<br />flat plate:most common floor <br /><ul><li> Easy of construction
  3. 3. Simpler and quicker construction
  4. 4. Reduces execution timeframe
  5. 5. Increases construction safety</li></ul>XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  6. 6. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTSCONCLUSIONS<br />flat slabs in office buildings in Spain<br />flat plate<br />waffle slab:very common floor in Spain <br /><ul><li>Relatively light, less weight
  7. 7. Less foundation costs
  8. 8. Longer spans are economic
  9. 9. Excellentvibration control</li></ul>XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  10. 10. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTSCONCLUSIONS<br />flat slabs in office buildings in Spain<br />flat plate<br />waffle slab<br />Post-tensioned flat plate:considerably more expensive in Spain<br /><ul><li> More efficient
  11. 11. Thinner slabs , lighter structures
  12. 12. Reduction in rebar tonnage
  13. 13. Reduced cracking and deflections
  14. 14. Reduced floor to floor height
  15. 15. ….</li></ul>Why do PT floors compete economically with traditional floor slabs in other countries?........ LOW SPECIALIZATION - sustainability criteria INTROD.<br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  16. 16. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTSCONCLUSIONS<br />CO2 emissions<br />Cement manufacturing process liberates approximately 5% of the total emissions delivered in the atmosphere annually. <br />LEED rating <br />is deficient, it does not reflect the significant contributions of PT concrete structural efficiency to real sustainability<br />it does not reward suitably more sustainable solutions aiming at the optimization of materials<br />Introduction of sustainability criteria in <br />construction may be a necessary evolution.<br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  17. 17. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTSCONCLUSIONS<br />Floor building<br /><ul><li> Office building in Madrid
  18. 18. Module 50x50 meters
  19. 19. Three levels: Parking, Storage (high loads) and Lobby
  20. 20. Mesh of columns with a distance of 8x8 m
  21. 21. Three structural solutions: flat plate, waffle slab and PT flat slab.
  22. 22. Thickness of the slabs and width of the ribs variations
  23. 23. PT: the prestressing is bonded, flat ducts, tendons are formed by 4 or 3 strands of 0.62”, grouped in a single flat duct (70x20mm)</li></ul>Study<br /><ul><li> The minimum thickness: EHE-08, EC-2 and ACI318-08 criteria
  24. 24. The minimum bonded reinforcement for crack control
  25. 25. Steel fiber variation
  26. 26. Measuring emissions from the quantities of materials (ITEC)</li></ul>XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  27. 27. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTSCONCLUSIONS<br />Measuring emissions from the quantities of materials<br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  28. 28. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTS CONCLUSIONS<br />Tons of CO2 depending on use and type of slab<br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  29. 29. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTS CONCLUSIONS<br />Tons of CO2. Solid flat plates (Basement-high loads)<br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  30. 30. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTS CONCLUSIONS<br />% of CO2 of flat slabs (Basement-high loads)<br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  31. 31. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINABILITY STUDY RESULTS CONCLUSIONS<br />1. Selection criteria<br />At present: designknownsolutions ….. No evolutionof specializedtechniques<br />Necessary: Project specialization and execution …Sustainable evolution in current construction practice<br />2. EHE-08 code – Building PT slabs<br />At present: innovative code with respect to special concrete issues or durability<br />Necessary: Sections specifically related to PT slabs should be revised urgently<br />3. Sustainability in the study<br />PT solution is always the most sustainable option, particularly for high loading<br />The difference is not so important in voided options with moderate loading.<br />Small changes in thickness, in width of the joist or in the topping slab do not significantly improve CO2 emission data.<br />Replacement of rebar for steel fibers does not involve a decrease in emissions<br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  32. 32. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINABILITY STUDY RESULTS CONCLUSIONS<br />REFERENCES<br />USGBC. U. S. Green Building Council. Green Building Design and Construction Reference Guide<br />POST-TENSIONING INSTITUTE. PTI. PT-Gray is the new Green. PTI Journal. 41. Sustainability and Post-Tensioned Concrete. August 2009. V.7. nº1. 2009.<br />EHE-08.Instrucción de Hormigón Estructural. Comisión Permanente del Hormigón. 1º edición revisada. Ministerio de Fomento. Madrid. 2008<br />Isaia, G.C. and Gastaldini, A.L, G. Concrete sustainability with very high amount of fly ash and slag. Ibracon Structures and materials<br />EC-2. Eurocode 2: Design of concrete structures- Part 1:General rules and rules for buildings.<br />Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary. An ACI Standard. Reported by ACI Committee 318. Structural Building Code. American Concrete Institute. USA.2008<br />CONCRETE SOCIETY. CS. Post-tensioned concrete floors. Design Handbook. Concrete Society Technical Report nº43. 2ªed. UK. 2005<br />POST-TENSIONING INSTITUTE. PTI. Post-Tensioning Manual. 6th Edition. <br />ATEP. Recomendaciones para el proyecto y construcción de losas postesadas con tendones no adherentes HP9.96. Manuales de la ATEP. <br />Institut de Tecnologia de la Construcció de Catalunya. ITEC. Banco estructurado de elementos constructivos BEDEC. <br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />
  33. 33. Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />INTRODUCTION SUSTAINIBILITY STUDY RESULTS CONCLUSIONS<br />Evolution and sustainability of in-situ concrete flat slabs in office buildings<br />Liébana, O.1; G. Pulido1, MD; Gómez Hermoso J. 2<br />1University of San Pablo CEU (Madrid)2University Politécnica de Madrid<br />XXXVII IAHS WORLD CONGRESS ON HOUSING. Santander (Spain). 26-29 October 2010<br />II. DESIGN FOR SUSTAINABILITY AND REFURBISHMENT. Criteria of design<br />

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