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What is NYC AC § 27-557?

Quick Answer

This section establishes minimum design values for uniformly distributed and concentrated live loads in buildings, as referenced in standard RS 9-2. It outlines requirements for the building framing to support concentrated loads and specifies conditions for omitting uniform loads in the presence of concentrated loads. Applies to architects, engineers, and building owners responsible for structural design.

General informational summary. Not legal advice for your situation. Consult an attorney before acting on any specific matter.

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§ 27-557 Floor live loads.

AC § 27-557

(a)Uniformly distributed live loads. The minimum design values established in reference standard RS 9-2 for various occupancies or uses shall be used subject to the provisions of subdivision (d) of this section. Where the occupancy or use of a space does not conform to any of those listed, the design load shall be determined by the architect or engineer subject to approval by the commissioner.

(b)Concentrated live loads.

(1)The building framing shall be capable of supporting the concentrated live loads established in reference standard RS 9-2, placed so as to produce maximum stress.

(2)Floors that support any items of machinery, electrical or mechanical equipment, or other concentrated live load in excess of one thousand pounds (including the weights of pads or bases) shall be designed to support such weight as a concentrated load or group of concentrated loads.

(c)Nonconcurrence.

(d)Conformance. For purposes of determining that the magnitude of the actual live load conforms to or is less than the minimum design live load established in this section, the actual uniform live load shall be approximated by averaging the total load actually applied over a rectangular area of one hundred fifty square feet having no side less than eight feet.

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