Today, the owners of a growing number of non-standard building designs like museums, arenas, stadiums, and structures with atria or large open spaces are turning to performance-based design for substantial cost savings and enhanced safety while maintaining architectural concerns.
As an International Code Council (ICC) accepted alternative, performance-based design allows “alternate materials and methods” that offer equivalent or superior fire safety performance. In terms of enhancing fire safety, this often involves using scientific calculations and engineering approaches as well as computer fire modeling to determine how a building would respond to fire. With this approach, a design is considered acceptable if the fire engineering analysis demonstrates that it meets the measurable performance criteria set at the start of the process.
“Performance-based design is really gaining traction for architects with new design and architectural goals, which the prescriptive code cannot handle,” says David Stacy, P.E., principal and founder of Performance Based Fire Protection Engineering, (PBFPE), a firm providing fire protection, life safety, and cost saving design consultation for U.S. and international structures.
MEETING BUILDING NEEDS
Chief among the challenges of protecting theaters, sports arenas, shopping malls and airport terminals, as well as many structures with entrance lobbies or atria, are massive open spaces where rapid smoke detection has proven to be difficult but is of critical importance. Detection is further complicated when air can become stratified, caught in voids, or is moved or removed by HVAC systems. Such structures are good candidates for performance-based design, specifically using early smoke detection due to the risk of a delayed response that can allow a fire to grow and spread.
For high-risk building conditions, such as large-volume spaces where many occupants may be exposed to the effects of fire, the International Building Code (IBC) calls for smoke control. In case of a fire, such a system will control smoke flow within a building, keep it from spreading to unwanted areas, and provide occupants a clear evacuation route.
Typically, for these large-volume spaces, mechanical smoke control or natural venting is used to maintain a smoke-free area as they exit from the building. Building owners and architects often want to limit the complexity and cost of these fans and systems, which can become quite demanding when based on prescriptive approaches.
Consequently, for a growing range of challenging projects, industry professionals are turning to performance-based smoke detection to not only reduce cost but also increase safety. For open spaces and special architectural features such as atria (large open air or skylight covered space surrounded by a building that are often several stories high), advanced aspirating smoke detector technology that draws in air and tests it at a central unit can cut cost and detect smoke at the earliest possible stage from flexibly placed, concealable sampling points.
BUILDING DESIGN SOLUTIONS
In terms of popular architectural features, Stacy notes that atria have become a key aspect of many buildings because they provide a feeling of space and light. He points out, though, that achieving sufficient smoke and fire control is vital to modern design approaches because poorly designed atria, smoke control and methods of detection could allow fire to quickly spread to a building’s upper stories.
From small two-story atria to million square foot entertainment and commercial structures, PBFPE provides design solutions needed to overcome fire protection challenges, increase life safety and obtain cost saving measures.
According to Stacy, on projects ranging from arenas to atria it is usually necessary to determine the requirements and capacities of a smoke control system. In such cases, he says that he often uses an aspirating smoke detector called VESDA-E VEA, manufactured by Xtralis, a global provider of early detection of fire and gas threats.
In smoke detection, advanced technologies such as the VEA provide early warning by aspirating—or drawing in air—from each room or area through small, flexible tubing. The air is then analyzed to identify the presence of minute smoke particles in a continuous process.
In addition, Stacy says that the early smoke detection provided by aspirating systems can reduce the cost and complexity of mechanical smoke control systems.
According to Stacy, he deploys aspirating smoke detection technology on a wide range of performance-based design goals. “Whether the goal of the performance-based design is to maintain tenability through a smoke control system, or to look at upper layer gas temperature to see if we could reduce other features of fire protection, in about 50 percent of projects, we at least entertain the option of adding aspirating smoke detection technology like the VEA.”
For more information:
Modern Contractor Solutions, MArch 2021
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