Aquarium Rooftop Amenity Deck

Exposure analysis of unprotected steel structure

Challenge

A portion of the aquarium rooftop is transformed into an event venue space with the addition of a new retractable pavilion. Based on the existing construction type of the building, prescriptive code dictates that the new pavilion must be provided with spray-applied fireproofing or intumescent paint to match the fire resistance rating of existing structural elements. In addition to the exorbitant installation cost, ongoing maintenance requirements and unsightly appearance, the spray-applied fireproofing was reason for much concern with the aquarium. Any overspray during application could harm the sharks!

Solution

We performed fire modeling to evaluate how the omission of spray-applied fireproofing would impact the structural performance of the pavilion. We also simulated the occupant evacuation from the space to ensure adequate time to safely egress. Through this holistic performance-based design analysis, we determined that in the event of a worst-case fire scenario the unprotected steel did not exhibit any reduction in structural performance and the occupants experienced safe conditions throughout egress.

Bottom Line

• $200,000 of savings in construction costs
• Eliminated risk of poisoning sharks