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

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

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XXXVII IAHS WORLD CONGRESS ON HOUSING. Oct-2010

XXXVII IAHS WORLD CONGRESS ON HOUSING. Oct-2010

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

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