ISC Security Design Criteria for New Federal Office Buildings and Major Modernization Projects A Review and Commentary (2003) / Chapter Skim
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2. A Performance-Based Approach to Security and Blast-Mitigating Building Design
2. A Performance-Based Approach to Security and Blast-Mitigating Building Design
Pages 9-24
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From page 9... ...
It is the committee's belief that setting specific goals and criteria for performance-based security design of federal buildings is an inherently governmental function, to be undertaken by the ISC itself, perhaps assisted by experts in drafting building codes and engineering standards. If the ISC wishes to implement a more formal performance-based approach for security-related design, crafting the necessary policy guidance and performance criteria should be given a high priority, as should development of the other process elements.
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From page 10... ...
Rather, it relates the design and construction of the building to the desired performance of the building under certain conditions (in the case of the ISC Security Design Criteria, a terrorist attack using conventional explosives) based on preset performance objectives.
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The important role played by test methods and standards, evaluation methods, design guides, and other verification methods is also readily seen. A Policy Framework for Security Design Goals The highest level of the building performance hierarchy consists of policy or societal goals.
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From page 12... ...
The purpose of these criteria is to help design facilities that save lives, prevent injuries, and protect critical functions and assets from a bombing or other physical attack. · The primary goal for facilities constructed using these guidelines is to protect the occupants from death and injury and to limit damage to the facility, its contents, and its mission from acts of terrorism and related violence that may reasonably be expected.
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From page 13... ...
Structures shall be designed and constructed to prevent loss of mission continuity due to the failure of a structural element or system loaded to levels determined by a facilityspecific risk assessment. Performance Requirements Operative or performance requirements state actual requirements in terms of performance criteria or expanded functional descriptions.
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. Exterior walls: To comply with Medium Protection Levels, exterior walls should be designed to resist elastically a pressure of X psi and an impulse loading of Y ~osi-msec: for Hicher Protection Levels.
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. Performance Levels Performance levels describe the desired, required, or expected performance of a building or structure in terms of a specified measure.
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The ISC Security Design Criteria already embody this concept to some degree through the four protection levels (low, medium/low, medium, and higher)
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Injuries to building or facility occupants may be locally significant, with a high risk to life, but are generally moderate in number and nature. There is a moderate likelihood of single life loss, a low probability of multiple life loss.
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Significant amounts of hazardous materials are released, with relocation needed beyond the immediate vicinity. Performance Criteria Performance criteria are the metrics against which performance should be measured, predicted, and evaluated for compliance with goals, funct~onal objectives, and performance requirements; these criteria are integral to a performance-based system.
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From page 19... ...
, and performance criteria (tactics) to give criteria users a simple visual representation of the damage to be expected for different magnitudes of anticipated threats and for the four ISC protection levels.
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From page 20... ...
Although this approach provides some performance criteria and a built-in comfort level, there is the chance that the prescriptive requirements (and associated criteria) do not, in fact, comply with the goals, performance objectives, and other elements of the performance-based system, due, perhaps, to new requirements or because metrics for assessing performance are unavailable or incompatible.
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From page 21... ...
Performance-based Solutions Performance-based solutions typically meet operative requirements and associated criteria by employing the analysis and design standards, guidelines, or practices generally accepted in the relevant professional disciplines. In the broadest sense, performance-based analysis and design is a process of designing a solution to meet specific performance goals that have been stated in terms of qualitative or quantitative objectives, criteria, or limitations of damage or injury (Meacham, 1998b)
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From page 22... ...
Verification Methods Verification methods can be defined to include test standards; test methods; and analytical methods, including computational models. In short, a verification method can be any document, system, test, method, or too!
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From page 23... ...
. 1 Select candidate design measures Evaluate candidate design options against design loads and performance criteria 1 \ ,~ _ .
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From page 24... ...
2001. ISC Security Design Criteria for New Federal Office Buildings and Major Modernization Projects.
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