13-52-120 Provision for partitions.

   In office buildings or similar structures in which subdividing partitions may be erected, rearranged or relocated, the uniform load of such partitions shall be assumed at not less than 20 pounds per square foot of floor area, whether or not partitions are shown on the plans, unless the specified live load exceeds 80 pounds per square foot. For columns, the uniform partition load shall be assumed a dead load.

(Prior code § 68-2.5; Added Coun. J. 11-29-89, p. 8387)

13-52-130 Concentrated loads.

   Floors, porches, decks, balconies and other similar surfaces shall be designed to support safely the uniformly distributed live loads prescribed in Section 13-52-090 or the concentrated load, in pounds-force, given in Table 13-52-130 as set out in this section, whichever produces the greater stresses. Unless otherwise specified, the indicated concentration shall be assumed to be uniformly distributed over an area two and one-half feet square (6.25 square feet) and shall be located so as to produce the maximum stress conditions in the structural members.

Table 13-52-130
MINIMUM CONCENTRATED LOADS

Location   Load (lbf)

Elevator machine room grating (on area of 4 in2)   300

Finish light floor plate construction (on area of an in2)   200

Garages   *

Office floors   2,000

Porch, deck and balcony (on an area of 4 in.2 applied so as to
produce the greatest stress)   300

Scuttles, skylight ribs, and accessible ceilings   200

Sidewalks   8,000

Stair treads (on area of 4 in2 at center of tread)   300

* Floors in garages or portions of buildings used for the storage of motor vehicles shall be designed for the uniformly distributed live loads of Table 13-52-090 set out in Section 13-52-090 or the following concentrated loads: (1) for passenger cars accommodating not more than nine passengers, 2,000 pounds-force acting on an area of 20 square inches; (2) mechanical parking structures without slab or deck, passenger cars only, 1,500 lbf per wheel; (3) for trucks or buses, maximum axle load on an area of 20 square inches per wheel.

(Prior code § 68-2.6; Added Coun. J. 11-29-89, p. 8387; Amend Coun. J. 10-1-03, p. 9163, § 4.4)

13-52-140 Accessible roof-supporting members.

   Any single panel point of the lower chord of roof trusses or any point of other primary structural members supporting roofs over manufacturing, commercial storage and warehousing, and commercial garage floors shall be capable of carrying safely a suspended concentrated load of not less than 2,000 lbf (pounds- force) in addition to dead load plus environmental loads. For all other occupancies, a load of 200 lbf shall be used of 2,000 lbf.

(Prior code § 68-2.7; Added Coun. J. 11-29-89, p. 8387)

13-52-150 Live loads not specified.

   For occupancies or uses not designated in Section 13-52-090, the live load shall be determined in a manner satisfactory to the building commissioner. Note: For additional information on live loads, see Appendix, Tables A3 and A4 of the American National Standards A.N.S.I. A58.1-1982 may be referenced.

(Prior code § 68-2.8; Added Coun. J. 11-29-89, p. 8387; Amend Coun. J. 9-13-89, p. 4604; Amend Coun. J. 3-5-03, p. 104990, § 20; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1)

13-52-160 Partial loading.

   The full intensity of the appropriately reduced live load applied only to a portion of the length of a structure or member shall be considered if it produces a more unfavorable effect than the same intensity applied over the full length of the structure or member. When the construction is such that the structural elements thereof act together as an elastic frame due to their continuity and the rigidity of the connections, the effect of such partial loading as will produce maximum stress in any member shall be provided for in the design.

(Prior code § 68-2.9; Added Coun. J. 11-29-89, p. 8387)

13-52-170 Impact loading.

   The live loads specified in Section 13-52-090 shall be assumed to include adequate allowance for ordinary impact conditions. Provision shall be made in the structural design for uses and loads that involve unusual vibration and impact forces.

   (a)   Elevators. All elevator loads shall be increased by 100 percent for impact, and the structural supports shall be designed within the limits of deflection prescribed by ASME A17.1 as adopted by Chapter 14C-3.

   (b)   Machinery. For the purpose of design, the weight of machinery and moving loads shall be increased as follows to allow for impact: (1) elevator machinery, 100 percent; (2) light machinery, shaft- or motor-driven, 20 percent; (3) reciprocating machinery or power-driven units, 50 percent; (4) hangers for floors or balconies, 33 percent. All percentages shall be increased if so recommended by the manufacturer.

   (c)   Craneways. All craneways except those using only manually powered cranes shall have their design loads increased for impact as follows: (1) a vertical force equal to 25 percent of the maximum wheel load; (2) a lateral force equal to 20 percent of the weight of the trolley and lifted load only, applied one-half at the top of each rail; and (3) a longitudinal force of ten percent of the maximum wheel loads of the crane applied at the top of the rail.

   (d)   Exception. Reductions in these loads may be permitted if substantiating technical data acceptable to the building commissioner is provided.

(Prior code § 68-2.10; Added Coun. J. 11-29-89, p. 8387; Amend Coun. J. 9-13-89, p. 4604; Amend Coun. J. 3-5-03, p. 104990, § 20; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1; Amend Coun. J. 3-28-18, p. 74459, Art. II, § 7)

13-52-180 Special loading.

   Driveways, sidewalks, spaces for storage of loaded or unloaded trucks or buses, and spaces to be occupied by tanks, tracks or other special equipment shall be designed for the actual weight of the superimposed loads.

(Prior code § 68-2.11; Added Coun. J. 11-29-89, p. 8387)

13-52-190 Posting of floor loads.

   (a)   In every building or other structure, or part thereof, used for mercantile industrial or storage purposes, the loads approved by the building commissioner shall be marked on placards of approved design. Such placards shall be supplied and securely affixed by the owner of the building, or his duly authorized agent, in a conspicuous place in each space to which they relate. Application of such placard shall be accompanied by a certification from a registered architect or registered structural engineer that he personally inspected the building and that he computed the safe load in conformity with the provisions of this ordinance. Duplicate placards may be issued to replace lost or destroyed placards without such certification upon payment of a fee in accordance with Section 13-32-320 of this Code, where the department of buildings has records of the safe floor load limits of particular buildings.

   (b)   Exceptions – Posting for floor loads shall not be required in buildings or portions thereof used exclusively for the production and distribution of electricity, gas or steam.

   (c)   Spaces in garages and parking facilities designed for the use of passenger automobiles only shall be placarded as follows: “This floor to be used for the storage of passenger automobiles only.”

(Prior code § 68-2.12; Added Coun. J. 11-29-89, p. 8387; Amend Coun. J. 9-13-89, p. 4604; Amend Coun. J. 3-5-03, p. 104990, § 20; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1)

13-52-200 Restriction on loading.

   The building owner shall ensure that a live load greater than that for which a floor or roof is approved by the Building Commissioner shall not be placed, or caused or permitted to be placed, on any floor or roof of a building or other structure.

(Prior code § 68-2.13; Added Coun. J. 11-29-89, p. 8387; Amend Coun. J. 9-13-89, p. 4604; Amend Coun. J. 3-5-03, p. 104990, § 20; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1; Amend Coun. J. 11-9-16, p. 36266, § 13)