7/5/22 Evaluation of Partial Usage of WPO 8 th Floor as an Assembly Area Shauvik Das
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May 3, 2023
Evaluation of Partial Usage of WPO 8th Floor as an Assembly Area
Shauvik Das
May 3, 2023 2
Code Research
• Partial Change of Occupancy: Portion of the 8th floor will convert to A-2.
Existing Building Code
of NYS
Work Classification
Method
Change of Occupancy (B to A-2)
May 3, 2023 3
Code ResearchChange of Occupancy Classification• Change of Occupancy with and without separation.• Fire Protection Systems• Means of Egress, General• Heights and Areas• Accessibility• Structural• Mechanical• Electrical• Plumbing
May 3, 2023 4
Fire Separation Between A-2 and B • In absence of fire barrier between A-2 and B occupancy,
building should comply with the following requirements. • High Rise Building! (More than 75 Feet)
• No separation is required!
Requirements Lowest level has fire department vehicle access Emergency Voice/Alarm Communication
System
Automatic Sprinkler System (Light Hazard Occupancies)
Emergency Power
Emergency Escape and Rescue Allowable Area and Height (IA construction)
Automatic Fire Detection Automatic Fire Alarm
May 3, 2023 5
Area Determination• Total Floor Area: 22400 SF• A-2 area: 10150 SF (Approximate)• B area: 12250 SF
May 3, 2023 6
Occupant Load Determination• Change to higher hazard category • Occupancy B (Hazard Category, B ) Occupancy A-2 (Hazard Category, 3)
• BC Table 1004.10.1: Maximum floor area allowances per occupant• A-2 (un-concentrated tables and chairs): 15 net• Business, B: 100 gross
Occupant Load (A-2) Occupant Load (B) Total Occupant Load = A-2 +B
676 persons 122 persons 798 persons
May 3, 2023 7
Means of Egress • BC 1019: Number of Exits: Existing is 2! • Maximum occupant load in A-2 can be 500!
• BC Table 1005.1: Egress Width per occupant load
Occupant Load (A-2) Occupant Load (B) Total Occupant Load = A-2 +B
500 persons 122 persons 622 persons
Occupancy A-2 + B Width of Stairways (With Sprinkler Systems)
Existing Width of Stairways (With Sprinkler
Systems)
Stairways (inches per occupant): 0.2
13.3 Feet 8.67 Feet
May 3, 2023 8
Means of Egress • Allowable Occupant Load in the 8th Floor Assembly Area
Occupant Load (A-2) Occupant Load (B) Total Occupant Load = A-2 +B
400 persons 122 persons 522 persons
May 3, 2023 9
Structural/Higher Gravity Loads• Confirm higher floor loading: Building Code• Table 1607.1: Minimum Uniformly Distributed Live Loads
and Minimum Concentrated Live LoadsOccupancy or Use Minimum uniformly distributed live
loads and minimum concentrated live loads
For Assembly areas-Moveable seats (A-2):
Uniform 100 Psf.
For Business areas (B) Uniform 50 Psf.
May 3, 2023 10
Mechanical Ventilation• Confirm Ventilation Requirements: Mechanical Code • Table 403.3: Required outdoor ventilation air
• A-2: 15 CFM per person• B: 20 CFM person
Occupant in A-2 Area CFM Requirements (Outdoor Air)
400 6000 CFM
May 3, 2023 11
Code Compliance Comments • Submit Permit application with a Floor Plan.• Permit Plan should demonstrate compliance with
Occupant LoadSeating Arrangements
Egress Components (Exits, Exit Signs, Exit Access)Fire Alarm Devices (Pull Stations)
Mechanical VentilationStructural/Gravity Loads
May 3, 2023 12
Summary • Change of Occupancy• Implications: Occupant Load Structural Load Mechanical Ventilation• Required Actions: Permit Application With Floor Plan
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