Page 181 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

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BUILDING CODES, LOADS, AND FIRE PROTECTION*

TABLE 4.3 Minimum Uniformly Distributed Live Loads, L O , and Minimum Concentrated Live Loads (Continued)
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Occupancy or use Uniform lb/ft (kN/m ) Conc. lb (kN)
Penal institutions
Cell blocks 40 (1.92)
Corridors 100 (4.79)
Residential
Dwellings (one- and two-family)
Uninhabitable attics without storage 10 (0.48)
Uninhabitable attics with storage 20 (0.96)
Habitable attics and sleeping areas 30 (1.44)
All other areas except stairs and balconies 40 (1.92)
Hotels and multifamily houses
Private rooms and corridors serving them 40 (1.92)
Public rooms and corridors serving them 100 (4.79)
Reviewing stands, grandstands, and bleachers 100 (4.79) [Note (4)]
Roofs See Secs. 4.3 and 4.9
Schools
Classrooms 40 (1.92) 1000 (4.45)
Corridors above first floor 80 (1.92) 1000 (4.45)
First-floor corridors 100 (4.79) 1000 (4.45)
Scuttles, skylight ribs, and accessible ceilings 200 (9.58)
Sidewalks, vehicular driveways, and yards subject to 250 (11.97) 8000 (35.60)
trucking [Note (5)] [Note (6)]
Stadiums and arenas
Bleachers 100 (4.79) [Note (4)]
Fixed seats (fastened to floor) 60 (2.87) [Note (4)]
Stairs and exit-ways 100 (4.79) [Note (7)]
One- and two-family residences only 40 (1.92)
Storage areas above ceilings 20 (0.96)
Storage warehouses (shall be designed for heavier loads
if required for anticipated storage)
Light 125 (6.00)
Heavy 250 (11.97)
Stores
Retail
First floor 100 (4.79) 1000 (4.45)
Upper floors 75 (3.59) 1000 (4.45)
Wholesale, all floors 125 (6.00) 1000 (4.45)
Vehicle barriers See Sec. 4.4
Walkways and elevated platforms (other than exit-ways) 60 (2.87)
Yards and terraces, pedestrians 100 (4.79)
Notes:
(1) Floors in garages or portions of building used for the storage of motor vehicles shall be designed for the uniformly distributed live loads of
Table 4.3 or the following concentrated load: (1) for garages restricted to passenger vehicles accommodating not more than nine passengers,
3000 lb (13.35 kN) acting on an area of 4.5 in by 4.5 in (114 mm by 114 mm, footprint of a jack); (2) for mechanical parking structures without
slab or deck which are used for storing passenger car only, 2250 lb (10 kN) per wheel.
(2) Garages accommodating trucks and buses shall be designed in accordance with an approved method, which contains provisions for truck and
bus loadings.
(3) The loading applies to stack room floors that support nonmobile, double-faced library bookstacks subject to the following limitations:
a. The nominal bookstack unit height shall not exceed 90 in (2290 mm).
b. The nominal shelf depth shall not exceed 12 in (305 mm) for each face.
c. Parallel rows of double-faced bookstacks shall be separated by aisles not less than 36 in (914 mm) wide.
(4) In addition to the vertical live loads, the design shall include horizontal swaying forces applied to each row of the seats as follows: 24 lb/linear ft
of seat applied in a direction parallel to each row of seats and 10 lb/ linear ft of seat applied in a direction perpendicular to each row of seats.
The parallel and perpendicular horizontal swaying forces need not be applied simultaneously.
(5) Other uniform loads in accordance with an approved method, which contains provisions for truck loadings, shall also be considered where
appropriate.
(6) The concentrated wheel load shall be applied on an area of 4.5 in by 4.5 in (114 mm by 114 mm, footprint of a jack).
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(7) Minimum concentrated load on stair treads [on area of 4 in (2580 mm )] is 300 lb (1.33 kN).
Source: From Minimum Design Loads for Buildings and Other Structures, SEI/ASCE 7-02, American Society of Civil Engineers, Reston, Va.,
with permission.
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