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For broad classifications of occupancies or fire hazards, prescriptive codes and standards identify, in very specific terms, exactly how individual fire protection systems are to be designed, installed, tested, and maintained. Prescriptive codes and standards have the benefit that they are easy to apply and enforce.


Additionally, buildings designed to prescriptive codes and standards have a good history of performance in fires. However, they do not result in uniform levels of safety or cost-benefit. Consider, for example, stores classified as mercantile occupancies.

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A store that sells greeting cards would fall under this occupancy classification, as would a store that sold liquor in bottles. Although the protection that would be required in these stores would be similar, the fire hazard presented by these stores would be different. When using performance-based designs, fire safety goals for a building are identified. These goals may include life safety, property protection, mission continuity, and environmental protection. These goals are subsequently refined into quantitative measures of building performance through engineering analysis and consultation with building stakeholders, such as the building owner and code enforcement officials.

Next, fire scenarios are established. Fire scenarios are descriptions of the types of fires from which the building is intended to provide protection. The next step is the selection of design strategies. The types of fire protection strategies that are used in performance-based design are no different than those that are used when applying prescriptive codes, such as detection, suppression, egress, or fire endurance.

After fire protection strategies are developed, they are evaluated using engineering tools and models to determine whether the fire safety goals are met for each of the fire scenarios.

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  • For most buildings, the entire building will not be designed on a performance basis. Much of the building will be designed using prescriptive codes, and for relatively simple buildings, all of the building will likely be designed using prescriptive codes. However, performance-based design offers opportunities to achieve desired aesthetics or functionality in a building. It also ensures that the fire performance of the whole building will be considered as more than an agglomeration of single systems. Historically, performance-based design has been practiced by use of "equivalency" or "alternate methods and materials" clauses found in most prescriptive codes.

    Structural fire engineering (with Q&A)

    These clauses permit the use of strategies other than those specified in the code, provided that they provide an equivalent or greater level of safety. Within the last few years, performance-based codes and design guides have been published. See following section, Emerging Issues. Designing from a "whole building" approach does not require that design be on a performance-basis.

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    It is necessary, however, that the design of fire protection-related systems be coordinated with each other and with other building systems and the overall building design. Additionally, fire protection engineers frequently collaborate with other design professionals in the design of the following systems:. Designing a building from a 'whole building' approach requires a fire protection engineer to coordinate the different types of fire protection that are designed into buildings including:.

    Performance-based design has been practiced for decades through the use of "equivalency" clauses and "alternate methods and materials" clauses found in most prescriptive codes.

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    In these cases, performance-based design was applied on an ad-hoc basis, with the approach used developed between the designer and code enforcement official. Over the last decade, performance-based design has become more formalized. In the U. Performance-based design facilitates designing fire protection from a "whole building" perspective, as it requires that interactions between all fire protection systems with the building and its occupants be considered. This attention may result in changes in the way buildings are designed, or an affirmation of current approaches. Fire protection is impacted by a number of codes and standards.

    An Introduction to Fire Protection Engineering for Buildings

    For example, prescriptive guidance will limit travel distances to, say 45m. In buildings such as airports and other large buildings this imposes an impractical restriction on building design. A fire safety engineering alternative method would look at the time taken to escape and compare that with the time for conditions to cease being tenable. This Guide will assist engineers to calculate escape times and tenability criteria and to make the judgement as to whether the performance criteria required by the regulations have been met.

    rikonn.biz/wp-content/2020-09-11/cellulare-cinese-simile-iphone-x.php Where there is any doubt regarding the reliability of the input data a conservative approach should be adopted. This may require the use of explicit safety factors to compensate for uncertainties in the assumptions.

    This is usually expressed in terms of the annual probability of occurrence of the unwanted event e. It must be recognised that, whatever measures are taken, risks can never be reduced to zero.

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    There are two ways of demonstrating compliance with the Building Regulations. Guidance documents such as Approved Document and British Standards cannot take into account the peculiarities of every single building design. The larger and more complex the design, the more difficult and more costly it is to ensure that the design meets the recommendations of the prescriptive codes.