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Title: Section 1604  •  Size: 5799

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SECTION 1604 - FLOOR DESIGN

1604.1 General. Floors shall be designed for the unit loads set forth in Table 16-A. These loads shall be taken as the minimum live loads in pounds per square foot of horizontal projection to be used in the design of buildings for the occupancies listed, and loads at least equal shall be assumed for uses not listed in this section but which create or accommodate similar loadings.

When it can be determined in designing floors that the actual live load will be greater than the value shown in Table 16-A, the actual live load shall be used in the design of such buildings or part thereof and special provisions shall be made for machine or apparatus loads.

1604.2 Distribution of Uniform Floor Loads. Where uniform floor loads are involved, consideration may be limited to full dead load on all spans in combination with full live load on adjacent spans and on alternate spans.

1604.3 Concentrated Loads. Provision shall be made in designing floors for a concentrated load as set forth in Table 16-A placed upon any space 2 1/2 feet (762 mm) square, wherever this load upon an otherwise unloaded floor would produce stresses greater than those caused by the uniform load required therefor.

Provision shall be made in areas where vehicles are used or stored for concentrated loads consisting of two or more loads spaced 5 feet (1524 mm) nominally on center without uniform live loads. Each load shall be 40 percent of the gross weight of the maximum-size vehicle to be accommodated. The condition of concentrated or uniform live load producing the greater stresses shall govern. Parking garages for the storage of private or pleasure-type motor vehicles with no repair or refueling shall have a floor system designed for a concentrated load of not less than 2,000 pounds (8.9 kN) acting on an area of 20 square inches (12 900 ) without uniform live loads. The condition of concentrated or uniform live load producing the greater stresses shall govern.

Provision shall be made for special vertical and lateral loads as set forth in Table 16-B.

1604.4 Partition Loads. Floors in office buildings and in other buildings where partition locations are subject to change shall be designed to support, in addition to all other loads, a uniformly distributed dead load equal to 20 pounds per square foot (0.96 kN/). Access floor systems may be designed to support, in addition to all other loads, a uniformly distributed dead load equal to 10 pounds per square foot (0.48 kN/).

1604.5 Live Loads Posted. The live loads for which each floor or part thereof of a commercial or industrial building is or has been designed shall have such designed live loads conspicuously posted by the owner in that part of each story in which they apply, using durable metal signs, and it shall be unlawful to remove or deface such notices. The occupant of the building shall be responsible for keeping the actual load below the allowable limits.

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