PERFORMANCE-BASED CODES WHY & HOW · PDF filePERFORMANCE-BASED CODES WHY & HOW Presentation by...
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PERFORMANCE-BASED CODESWHY & HOW
Presentation by Associate Professor Teh Kem Jin Department of ArchitectureSchool of Design and Environment National University of Singapore
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PERFORMANCE-BASED CODESWHY & HOW
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PERFORMANCE-BASED CODESWHY & HOW
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PERFORMANCE-BASED CODESWHY & HOW
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PERFORMANCE-BASED CODESWHY & HOW
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PERFORMANCE-BASED CODESWHY & HOW
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PERFORMANCE-BASED CODES
INTRODUCTION
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PERFORMANCE-BASED CODES
INTRODUCTION
SINGAPORE POST-COLONIAL TRADITION
Building codes and regulations
in Singapore were adapted from
British codes and codes from
other developed countries
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PERFORMANCE-BASED CODES
INTRODUCTION
SINGAPORE POST-COLONIAL TRADITION
By tradition and for expediency ofimplementation, building codes
and regulations were prescriptive
– when buildings were small inscale, when it was possible to
anticipate building designs and
outcomes
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PERFORMANCE-BASED CODES
WHY?
PRESCRIPTIVE CODES
ALLOW SPECIFICATION OF SOLUTIONS WITH
EASE OF CONTROL
THE NATURE OF PRESCRIPTIVE CODES
RESULTS IN THE LIMITATION OF THE RANGE
OF POSSIBLE SOLUTIONS
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PERFORMANCE-BASED CODES
PRESCRIPTIVE CODES – PROBLEMS
TOO RIGID
UNABLE TO KEEP UP WITH CHANGES
IN DESIGN AND INNOVATION
PROBLEMS OF OVER-PROVISION
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PERFORMANCE-BASED CODES
PRESCRIPTIVE CODES - COMMENTS
The deem-to-satisfy provisions are veryconservative
Things are changing – there is a need to bemore efficient
Philip Chun, Australian Building Code Consultant
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PERFORMANCE-BASED CODES
PRESCRIPTIVE CODES - COMMENTS
The New Zealand Building Code aims toimplement only the requirements needed –“what you really must do”
The approved documents are only one of theways to fulfill the Performance Requirements– such provisions are conservative
Dr Bill Porteous, CEO, Building Industry Authority, New Zealand
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PERFORMANCE-BASED CODES
PRESCRIPTIVE CODES - COMMENTS
The presumption that there is only one way
of providing the level of safety makes the
prescriptive code rigid and inflexible
Hadjisophocleous and Benichou (1999) – Performance CriteriaUsed in Fire Safety Design, Automation in Construction, 8, 489-501
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PERFORMANCE-BASED CODES
PRESCRIPTIVE CODES - COMMENTS
The introduction of Performance-based
Regulation is to relax provisions that were
over-stipulated in the BCA 91
Keith Hatfield, Department of Urban Service, Canberra, ACT
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PERFORMANCE-BASED CODES
Definition
A Performance-based Code specifies a
required level of Performance
It allows the designer and project
owner to determine the solution and
method to achieve the end goal
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PERFORMANCE-BASED CODES
FLEXIBILITY
PERFORMANCE-BASED CODES ENABLE
THE APPLICATION OF ALTERNATIVE
SOLUTIONS
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PERFORMANCE-BASED CODES
OBJECTIVE
FUNCTIONAL REQUIREMENTS
PERFORMANCE CRITERIA
AUSTRALIAN APPROACH
Alternative Solution
• Equivalence to Deemed-to-satisfyProvision
• Direct Assessment against PerformanceRequirements
Acceptable Solutions
or
Deemed-to-satisfy Provisions
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PERFORMANCE-BASED CODES
OBJECTIVE
THE OBJECTIVE CLEARLY
ESTABLISHES THE INTENTION OF
EACH SECTION OF THE CODE
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PERFORMANCE-BASED CODES
FUNCTIONAL REQUIREMENTS
DESCRIBE THE FUNCTIONS THAT
NEEDS TO BE ASSURED TO ACHIEVE
THE OBJECTIVE
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PERFORMANCE-BASED CODES
PERFORMANCE CRITERIA
CLARIFIES METHOD USED TO JUDGE
COMPLIANCE WITH THE OBJECTIVE
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PERFORMANCE-BASED CODES
ACCEPTABLE SOLUTIONS
DEEMED-TO SATISFY
PRESCRIPTIVE SOLUTIONS
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PERFORMANCE-BASED CODES
ALTERNATIVE SOLUTION
DIRECT ASSESSMENT AGAINST
PERFORMANCE REQUIREMENT
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PERFORMANCE-BASED CODES
OBJECTIVE
PERFORMANCE REQUIREMENTS
ACCEPTABLE SOLUTIONS
SINGAPORE
CONVENTIONAL APPROACH
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PERFORMANCE-BASED CODES
OBJECTIVE
THE OBJECTIVE CLEARLY
ESTABLISHES THE INTENTION OF
EACH SECTION OF THE CODE
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PERFORMANCE-BASED CODES
PERFORMANCE REQUIREMENTS
THE PERFORMANCE REQUIREMENTS
ESTABLISH THE FUNCTIONAL
REQUIREMENTS AND THE
PERFORMANCE CRITERIA BY WHICH
COMPLIANCE WITH THE OBJECTIVE
MAY BE ASSESSED
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PERFORMANCE-BASED CODES
ACCEPTABLE SOLUTIONS
THE ACCEPTABLE SOLUTIONSREPRESENT THE ‘DEEMED-TO-SATISFY’
SOLUTIONS
PRESCRIBED SOLUTIONS
COMPLIANCE WITH THE ACCEPTABLESOLUTIONS IS DEEM-TO-SATISFY THE
REQUIREMENTS OF THEPERFORMANCE-BASED CODE
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PERFORMANCE-BASED CODES
OBJECTIVE
PERFORMANCE REQUIREMENTS
ALTERNATIVE SOLUTIONS
ALTERNATIVE APPROACH
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PERFORMANCE-BASED CODES
ALTERNATIVE SOLUTIONS
ALTERNATIVE SOLUTIONS MAY BEACHIEVED BY VERIFICATION OF
PERFORMANCE
BY ANALYTICAL METHODS ORMATHEMATICAL MODELS
BY SCIENTIFIC TESTS
BY METHODS ACCEPTABLE TO THEAUTHORITIES
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PERFORMANCE-BASED CODES
ALTERNATIVE SOLUTIONS
BY COMPARISON WITH ACCEPTABLESOLUTIONS
DEMONSTRATE THAT THE ALTERNATIVESOLUTIONS ACHIEVE EQUIVALENT
STANDARD OF PERFORMANCE
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PERFORMANCE-BASED CODES
EXAMPLE – LIGHTING REQUIREMENT
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PERFORMANCE-BASED CODES
EXAMPLE – LIGHTING REQUIREMENT
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PERFORMANCE-BASED CODES
EXAMPLE – LIGHTING REQUIREMENT
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PERFORMANCE-BASED CODES
EXAMPLE – LIGHTING REQUIREMENT
OBJECTIVE
SAFEGUARD PEOPLE FROM INJURY,
ILLNESS OR LOSS OF AMENITY DUE TO
ISOLATION FROM NATURAL LIGHTING AND
LACK OF ARTIFICIAL LIGHTING
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PERFORMANCE-BASED CODES
EXAMPLE – LIGHTING REQUIREMENT
PERFORMANCE REQUIREMENT
LIGHTING PROVIDED FOR PEOPLE IN A
BUILDING SHALL BE ADEQUATE FOR ITS
INTENDED PURPOSE
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PERFORMANCE-BASED CODES
EXAMPLE – LIGHTING REQUIREMENT
ACCEPTABLE SOLUTION
RESIDENTIAL BUILDINGS – ONLY THE
PROVISION OF NATURAL LIGHTING IS
DEEMED TO SATISFY THE REQUIREMENT
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PERFORMANCE-BASED CODES
EXAMPLE – LIGHTING REQUIREMENT
ACCEPTABLE SOLUTION
AGGREGATE AREA – NOT LESS THAN 10%
OF THE FLOOR AREA
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PERFORMANCE-BASED CODES
EXAMPLE – LIGHTING REQUIREMENT
ACCEPTABLE SOLUTION
REQUIREMENT DOES NOT INCLUDE
ROOMS SUCH AS BATHROOM, TOILET,
STOREROOM, BASEMENT OR CIVIL
DEFENCE SHELTER
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PERFORMANCE-BASED CODES
EXAMPLE – LIGHTING REQUIREMENT
ACCEPTABLE SOLUTION
ARTIFICIAL LIGHTING SYSTEM THAT
COMPLIES WITH THE RELEVANT CODE OF
PRACTICE
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PERFORMANCE-BASED CODES
ALTERNATIVE SOLUTION
DEMONSTRATE THAT THE
ALTERNATIVE SOLUTIONS
ACHIEVE EQUIVALENT STANDARD
OF PERFORMANCE
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PERFORMANCE-BASED CODES
ALTERNATIVE SOLUTION
HONGKONG BANK BUILDING - LIGHT SCOOP
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PERFORMANCE-BASED CODES
ALTERNATIVE SOLUTION
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PERFORMANCE-BASED CODES
EXAMPLE – SAFETY FROM FALLING
OBJECTIVE
SAFEGUARD PEOPLE FROM INJURY
CAUSED BY FALLING
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PERFORMANCE-BASED CODES
EXAMPLE – SAFETY FROM FALLING
PERFORMANCE REQUIREMENT
WHERE PEOPLE COULD FALL 1.0m OR
MORE, FROM ONE LEVEL TO ANOTHER, A
BARRIER SHALL BE PROVIDED
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PERFORMANCE-BASED CODES
EXAMPLE – SAFETY FROM FALLING
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PERFORMANCE-BASED CODES
EXAMPLE – SAFETY FROM FALLING
PERFORMANCE REQUIREMENT
ADEQUATE MEANS SHALL BE PROVIDED
TO PREVENT PEOPLE FROM FALLING
OVER AND FALLING THROUGH
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PERFORMANCE-BASED CODES
EXAMPLE – SAFETY FROM FALLING
ACCEPTABLE SOLUTION
THE HEIGHT OF BARRIER AT ANY
LOCATION SHALL NOT BE LESS THAN
900mm
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PERFORMANCE-BASED CODES
EXAMPLE – SAFETY FROM FALLING
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PERFORMANCE-BASED CODES
EXAMPLE – SAFETY FROM FALLING
ACCEPTABLE SOLUTION
THE SIZE OF OPENING OR GAP IN THE BARRIER,
100mm - RESIDENTIAL, CHILD CARE, SHOPPING
COMPLEX, PUBLIC RESORT
150mm – OTHER BUILDINGS
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PERFORMANCE-BASED CODES
EXAMPLE – SAFETY FROM FALLING
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PERFORMANCE-BASED CODES
ALTERNATIVE SOLUTION?
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PERFORMANCE-BASED CODES
APPRAISSAL
RATIONALIZE CODE REQUIREMENTS
CLEARLY ESTABLISH OBJECTIVE AND
PERFORMANCE REQUIREMENTS
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PERFORMANCE-BASED CODES
APPRAISSAL
IMPORTANT THAT ‘PRESCRIPTIVE’
SOLUTIONS SATISFY THE EXACT
REQUIREMENTS OF THE PERFORMANCE
CRITERIA
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PERFORMANCE-BASED CODES
PRESCRIPTIVE CODES - COMMENTS
Prescriptive solutions were usually
formulated through experience – some
of the prescriptive solutions did not
fulfill the objectives of the code
Philip ChunAustralian Building Code Consultant
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PERFORMANCE-BASED CODES
APPRAISSAL
ACCEPTABLE SOLUTIONS WILL
INFLUENCE BUILDING PROVISIONS
SHOULD CONTINUE TO EVOLVE WITH
FUTURE TRENDS AND INNOVATIONS
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PERFORMANCE-BASED CODES
APPRAISSAL
POLICY DECISIONS
NOT SUBJECTED TO PERFORMANCE
EVALUATION
Example – Policy that involves Energy Conservation inSingapore
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PERFORMANCE-BASED CODES
CONCLUSION
IMPLEMENTATION OF
PERFORMANCE-BASED CODES IS A
REFLECTION OF THE MATURING OF
THE CONSTRUCTION INDUSTRY AND
THE PROFESSIONS
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PERFORMANCE-BASED CODES
CONCLUSION
SET STANDARDS THROUGH THE
ADOPTION OF ESTABLISHED
PRINCIPLES
PROVIDE PRACTITIONERS WITH
TRANSPARENT SET OF GUIDELINES
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PERFORMANCE-BASED CODES
CONCLUSION
ENABLES INDUSTRY TO OPTIMIZE
PROVISIONS
POTENTIAL SAVINGS IN COST
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PERFORMANCE-BASED CODES
CONCLUSION
INDUSTRY WILL BE BETTER INFORMED
ON BUILDING REQUIREMENTS
BETTER ABLE TO ACHIEVE STANDARD IN
KEEPING WITH MODERN DEVELOPMENTS