straighten

Live Load

Live Load (NBC2020)
v1.0.0
File:
Project:
Designer:
Date:

Use of Area of Floor or Roof

Use of Area of FLoor or Roof Min Load (kPa)
Assembly Areas
a) Except for the areas listed under b), c), d) and e), assembly areas with or without fixed seates including:
Arenas (no fixed seats w/ backs) 4.8
Auditoria 4.8
Churches (no fixed seats w/ backs) 4.8
Dance floors 4.8
Dining areas 4.8
Foyers and entrance halls 4.8
Grandstands (no fixed seats w/ backs) 4.8
Gymnasia 4.8
Lecture halls (no fixed seats w/ backs) 4.8
Museums 4.8
Promenades 4.8
Rinks 4.8
Stadia (no fixed seats w/ backs) 4.8
Theatres (no fixed seats w/ backs) 4.8
Other similar assembly areas 4.8
b)
Classrooms and courtrooms (any seating) 2.4
c) Portions of assembly areas with fixed seats that have backs for the following uses:
Arenas 2.9
Grandstands 2.9
Stadia 2.9
d) Portions of assembly areas with fixed seats that have backs for the following uses:
Churches 2.4
Lecture halls 2.4
Theatres 2.4
e)
Vomitories, exits, lobbies, corridors 4.8
Attics
Accessible by a stairway in residential occupancies only 1.4
Having limited accessibility so that there is no storage of equipment or material 0.5
Balconies
Exterior 4.8
Interior and mezzanines that could be used by an assembly of people as a viewing area 4.8
Interior and mezzanines other than above [see CL 4.1.5.4]
Corridors, lobbies and aisles
Corridors/lobbies/aisles (general) 4.8
Corridors under 1200 mm wide in res. buildings [see CL 4.1.5.4]
Equipment areas and service rooms including
Generator rooms 3.6
Use of Area
Exits and fire escapes 4.8
Factories 6.0
Footbridges 4.8
Garages for vehicles ≤ 4000 kg gross weight 2.4
Garages for vehicles exceeding 4000 kg but not exceeding 9000 kg gross weight 6.0
Garages for vehicles > 9000 kg gross weight 12.0
Kitchens (other than residential) 4.8
Libraries – Stack rooms 7.2
Libraries – Reading and study rooms 2.9
Offices (not including record storage and computer rooms) located in basements and floors, including mezzanines, with direct access to the exterior at ground level. 4.8
Offices (other floors)(not including record storage and computer rooms) 2.4
Operating rooms and laboratories 3.6
Patients' bedrooms 1.9
Recreation areas that cannot be used for assembly purposes including: Billiard rooms, Bowling alleys, Pool Rooms 3.6
Residential areas - Sleeping and living quarters in apartments, hotels, motels, boarding schools and colleges 1.9
Residential – Bedrooms, Other areas, Stairs within dwelling units 1.9
Residential – Other areas 1.9
Retail and wholesale areas 4.8
Roofs 1.0
Sidewalks and driveways over areaways and basements 12.0
Storage areas 4.8
Toilet areas 2.4
Underground slabs with earth cover
Warehouses 4.8

Tributary Area

Tributary area, A:
m2

Uniformly Distributed Live Load

[Table. 4.1.5.3.]

Use of Area of Floor or Roof: Assembly Area - Auditoria

Minimum Specified Load: 4.8 kPa (100.2psf)

Concentrated Live Load

[Table. 4.1.5.9.]
Area: Floors of offices, manufacturing buildings, hospital wards and stages

Minimum Specified Concentrated Load: 9 kN

Loaded Area: 750x750 mm

Variation with Tributary Area

[cl. 4.1.5.8.]
Tributary Area = 100 m2
Cl 4.1.5.8.3) For assembly occupancies with a live load of 4.8 kPa or greater, storage, manufacturing, retail stores, garages or footbridges. Where the structural member supports a tributary area greater than 80 m2
Tributary area factor = 0.5 + (20/Tributary Area)0.5

Tributary Area Factor = 0.95

Note: Reduction factor does not apply to one-way and two-way floor slabs (CL 4.1.5.8.1)

This information must be read or used in conjunction with Part 4 of the NBC 2020. In the event of discrepancies, Part 4 of the NBC 2020 shall govern.