1917 (#619-628) - Laserfiche WebLink

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192 Stables ..................................... Garages ..................................... lO0 Office buildings, let floor ............... lO0 Office buildings or floors above 1st School houses and placesof instruction ....... 100 Auditoriums or places of public assemblage ... 125 Ordinary stores ................... 100 Roofs ........ 30 Buildings Buildings not classified in the above table must be designed to safely carry the loads to which they may be sub- Jected. Every column or vertical support shall be of sufficient strength to bea~ safely the weight of the portion of the floor depending on it. When calculating the necessary strength of columns in all buildings over 5 stories in height it shall be permiesable to reduce the live load 5 per cent for each succeed- ing floor below the top floor until 50 per cent of the live loads fixed by the preceding section is reached. When such reduced loads shall be used for all remaining floors down to and including the second floor, but the full live load shall be taken on the first floor. All beams and girders mu~t be calculated to support the full live and dead loads. The weight placed on any floor of any b~lildi~g shall be safely distr~buted thereon and the buildiug lnspec~or may require the lighteniuE or re-distribution of any load when he deems it necessary. ~hen any pa~t of any building is used for storage of any materials or for manufacturing purposes, there shall be posted in a conspicuous place on each floor, on a form to be supplied by the building inspector, a statement as to th~ load that the floor may ~m safely carry per superficial foot, 'and the floor must not be loaded beyond this capacity. Compu- tation of this load to be made by the building inspector. It shall be deemed a misdemeanor to overload such a floor. When no test of the sustaining power of the soil is made, different soils shall be deemed to safely sustain the ~ollowing loads per superficial foot~ Soft clay one ton: Ordinary clay and sand together in layer wet and springy, two tons: Loamy clay or fine sand dry, 3 tons; very firm coarse sand or still gravel 4 tons, hard pan 4 tons. When a test is made of sustaining power of the soil the building inspector may modify these requirements but he shall be notified when such test is to take place and may be present either in person or by representative. The report of the test shall be filed in the office of the building inspecto=, and when doubt arises as to the safe sustaining power of the soil upon which a building is to b.~ erected, the building inspector may order borinss or other tests to be made to determine the safe load for estimating the load or footings the following con- ditions must be observed: Warehouses and factories, fu~l dead and full live load to be taken. In stores and buildings for light manufacturing purposes, and in buildiugs for public assemblages or amusement, full dead load and ~5 per cent o~ the ~ive load; in office build- ings, hotels, apartment houses, dwellings, stables, a full de,el load and 60 per cent of live load. Footings must be so designed as to make the load as nearly uniform as possible. Safe bearing load on brick work shell be taken as g tons per superficial foot when lime mortar is used. When lime and cement mortar are used ll~ tonsl when cement mortar is used 1~ tons. For rubble stone work 5 tons per superficial foot shall be the maximum load, when lime mortar is used, g tons, when cement moztar other than Portland is used; y tons when lime and cement mortar are used~ 10 tons when Portland cement mortar is used; a ss~fe bearing load of concrete shall be taken at g tons per superficial foot, when other than Portland cement is used, and l~ tons when Portland is used. Materials used in the construction of buildings shall be of good quality for the purpose intended. Cement must meet the requirements of American Society for Testing Materials, and steel shall meet the standard requirements. Should any doubt arise as to the quality of materials the building inspector ms~ order tests to be made under his supervision and m certified copy of such test shall be filed with him ~t the expense of the con- tractor. Section 24. Every projection beyond the wall line of Class "B" or "C" building shall be made of incombustible material excepting as hereinafter provided. Metal cornices shall have riveted joints and shall be supported by heavy steel or iron brackets properly braced. Such brackets must b3 capable Sf sUS- taining a test load of th=es times that which they are designed to carry, and must be properly anchored through the masonry wall or attached to the roof. The roof covering o~ any cornice may be sheathed with wood, provided that such sheathing is entirely covered with metal or composition roofing. It may extend to within 6 inches of the front edge of the cornice, but this 6~ must be covered with metal, and the brick fire wall must be carried solidly to the underside of the boemdin~ forming the top of the cornice. In all buildings of Class "C" construction, the ceiling of ~ery cellar or basement shall be metal lathed and plastered or otherwise fireproofed.