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Post-Earthquake Fire Performance

To date, only a handful of full-scale building experiments have been conducted world-wide, and none have evaluated the post-earthquake fire performance of the complete building system. The full-scale building tests in this project allow for the unique opportunity to assess the integrated building fire safety system performance under post-earthquake conditions. It provides an opportunity to identify those characteristics of either ground motion induced damage, resulting fires, or the combination of systems damage and fire, that can lead to dangerous situations for escaping occupants and emergency responders. In particular, it allows investigation into failure or significantly reduced performance of passive and active fire protection systems, with a focus on those failures which could lead to room-to-room fire spread, building-to-building fire spread, untenable conditions during egress and/or localized or global failure during fire-fighting operations.

Typical passive measures
Fig. 1 Typical passive measures
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Fire protection systems are generally categorized as being passive or active. Passive measures include fire resistivity of structural members and compartment barriers, spray-applied fire protection, fire resistive interior finish materials, penetration seals, doors and dampers (Fig. 1). Active measures include fire suppression, detection, alarm, communication and smoke management systems (Fig. 2). In addition, measures for emergency egress and fire fighting activities are also needed in a building, including protected exits, elevator recall and fire fighters override, wet or dry standpipes. The infrastructure required to support these measures include reliable water supply (mains to building, local storage tanks), primary and emergency power, and occupant and emergency responder communication systems. The level of building fire safety provided during a fire event depends on the ability to deliver the expected system performance on demand.

Representative sprinkler system components
Fig. 2 Representative
sprinkler system components

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In the first instance, data will be collected relative to forces on the fire protection systems during ground movement. This will then be followed by visual, pressure, and other non-destructive testing. The building will then be subjected to controlled fires, which will be used to assess thermal and non-thermal response. Tests will include moderate and fast burning fires up to 5MW peak heat release rate. Tests will be conducted using a natural gas burner. The use of a gas burner has been selected since it provides the dual benefit of better control of fire growth rate and heat release rate – data which are important to fire effects modeling – and the ability to immediately terminate the fire, which serves to protect the structure from unacceptable damage from fire or fire suppression activity (particularly in the cases where the sprinkler system is unavailable or disabled.