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THE BUILDING ENVELOPE: Lecture 3

THE BUILDING ENVELOPE: Lecture 3. Building Codes and Standards. MODEL BUILDING CODES. Establish standard of practice Represent “minimum” standards Must be adopted by local authority to be “legal”. MODEL BUILDING CODES. April 2000 : Uniform Building Code Standard Building Code

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THE BUILDING ENVELOPE: Lecture 3

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  1. THE BUILDING ENVELOPE: Lecture 3 Building Codes and Standards

  2. MODEL BUILDING CODES • Establish standard of practice • Represent “minimum” standards • Must be adopted by local authority to be “legal”

  3. MODEL BUILDING CODES April 2000: Uniform Building Code Standard Building Code BOCA/Basic Building Code became The International Building Code

  4. INTERNATIONAL BUILDING CODE • One national consensus model code • Based on national consensus standard (ASCE 7) • Will become standard of practice in foreseeable future as local jurisdictions formally adopt the IBC

  5. INTERNATIONAL RESIDENTIAL CODE • Replaces CABO “One- and Two-Family Dwelling Code” • Residential buildings where V > 110 mph must be designed for loads in ASCE 7 • Requires that ~ one-half of new residential buildings in U.S. be “engineered”

  6. ASCE 7 • “Minimum Design Loads for Buildings and Other Structures” (ASCE, 2002) • National consensus standard • Captures modern wind engineering technology • Addresses factors judged to affect significantly the pressures that act on buildings in windstorms

  7. ASCE 7: FACTORS THAT AFFECT PRESSURE • wind speed (V) • terrain (Kz) • topography (Kzt) • wind direction (Kd) • wind gusts (G) • building geometry (Cp) • relative importance of the building (I).

  8. NATIONAL CONSENSUS STANDARDS ASCE 7: Minimum Design Loads ASTM: Wind Borne Debris AISC/AISI: Steel Construction ACI: Reinforced Concrete NFPA: Timber Construction NCMA: Concrete Masonry MBMA: Metal Buildings AAMA: Architectural Glazing

  9. LOCAL BUILDING CODES Formal enactment of laws or ordinances are necessary for legal enforcement of Local Building Codes • State Building Codes • County Building Codes • Municipal Building Codes • Insurance Building Codes

  10. PERFORMANCE AND PRESCRIPTIVE CODES Performance Codes: Require the designer to meet specific performance standards (e.g., a specific design wind speed) Prescriptive Codes: Prescribe construction details for the builder (i.e., if the builder conforms the building is deemed to be in compliance)

  11. THE "EITHER/OR" OPTION • The IRC and ASCE 7 offer the designer an two options: Design for (1) windborne debris (i.e. window protection) or (2) for internal pressure • Many designers opt for Option 2 • Option 2 is often short sighted

  12. BEYOND CODE MINIMUMS • IBC/IRC and ASCE 7 establish minimum requirements • Designer has responsibility to assess special project conditions that may warrant attention beyond code minimums • Special design requirements may be established

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