The daily morning journal and courier., 1897-12-22


 fore stated to be supported on the floors and roofs, together with any other loads that will come upon said column, post or vertical support.
 Sec. 34. The strength of all columns and posts shall be computed according to Gordon's s formulae and the crushing weights in pounds to the square inch of section, used as co-ef- flcients in said formulae, shall not exceed the following for materials named, namely:
 Pounds. Cast iron ........................... 80 900 Rolled steel ........................... AS 900 Wrought or rolled iron ................... 40 900 American oak ...........,...,........... 4,5GO Pitch of Georgia yellow pine ........ 5,000 Spruce ................,........ 3,000 Sec. 35. The breaking strength of wooden beams and girders shall be computed accord ing to the formulae in which the constants for transverse strains for central loads shall be as follows, namely:
 Pounds Hemlock ..................,...... 2l2 spruce asU Pitch or Georgia yellow pine ............. 400 American oak ............................ 300 The wooden beams and girders carrying a uniformly distributed loads the constants will be doubled.
 Sec 36 The factors of safety shall be as one to four for all beams girders and other pieces subject to transverse strain; as one to four for all posts, columns, or other vertical supports when of wrought iron or rolled steel and as one to six for cast iron posts columns or other vertical supports; as one to five for other materials subject to a con- pression strain, and as one to six for tie-rods, tie-beams and other pieces subject to a tensile strain.
 Sec. 37. Good, solid, natural earth shall be deemed to safely sustain load of four tons to, the superficial foot or as otherwise deter mined by the Inspector of Buildings, and the width of the footing courses shall be at least sufficient to meet this requirement.. In com putting the weight of walls, cubic foot of brick work shall be deemed to weigh one hun dred and fifteen pounds. Sandstone, white marble. granite and other kinds of building stone shall be deemed to weigh one hundred and sixty pounds per cubic foot. The safe- bearing load to apply to good brick work shall be taken at eight tons per superficial foot, when good lime mortar Is used; eleven and one-half tons per superficial foot, when good lime and cement mortar is used. The safe-bearing load to apply to good concrete shall be taken at eleven tons per superficial foot. Even temporary support placed under any structure, wall, girder or beam, during the erction, finishing, alteration or repairing of any building or structure, or any part thereof shall be of sufficient strength to safe ly carry the load to be placed thereon. In all warehouses, storehouses, factories workshops, stores, and other buildings where heavy ma terials arc kept or stored or machinery in troduced. the weight that each floor will
 
 Of shall be estimated by the owner or oc- cupant, or by a competent person employed by the owner or occupant. Before any building hereafter ercted is occupied and used, in whole or In part, for any of the purposes aforesaid, and before any building erected prior to the passage of this act, but not at such time oc- cupied for any of the aforesaid purposes Is occupied or used, in whole or In part, for any of said purposes, the weight that each floor will safely sustain upon each superficial foot thereof shall be ascertained and posted in a conspicuous place on each story of the build ing to which it relates. The weight placed on any of the floors of any building shall be safely distributed thereon, and the h. spector of Buildings may require the owner or occupant of any building, or of any por ton thereof, to redstribute the load on any floor, or to tighten such load, as he may direct, where he may deem the same to be necessary for the protection of life and prop erty No person shall place or cause or per- init to be placed on any floor of any building any greater load than the safe load thereof, as correctly estimated and ascertained as here in provided. If the Inspector of Buildings shall have cause to doubt the correctness of said estimate he is empowered to revise and correct the same, and for the purpose of such revision the officers and employees of said department of buildings may enter any build ing and remove so much of any floor or other portion thereof as may be required to make necessary measurements and examinations, and any expense necessarily incurred in re- moving any HOOF or OCner pOTtlOn or any DuliQ- ing for the purpose of making any eXanlina- ton herein provided for shall be paid by the City Treasurer upon the requisition of the Inspector of Buildings. Such expenses sail be 6 charge against the person or persons by whom or on whose behalf said estimate was made. and shall be collected in all action to be brought In the name of said department of buildings or fire department as the case may be, against said person or persons, and the sum so collected shall be paid over to hn 1pnaSfpd iu said fund in reimbursement of the amount paid as aforesaid.
 Sec 3s. Every building hereafter erected to be used as 8 noted or schoolhouse. the height of which exceeds sixty feet, and every building hereafter erected or altered to be used as hospital, asylum, or institution for the treatment of persons, the height of which exceeds forty-ive feet and every other build ing, the height of which exceeds seventy-fve feet, except grain elevators and buildings for which specifications and plans have been here- tofore submitted to and approved by the proper authorities, shall be built hre-proof, that is to say, they shall be constructed with walls Of brick, stone, iron or other hard, uncomfortable material, in which wooden beams or lintes shall not be placed and in which the floors and roofs shall be of materials similar to the walls. The stairs and staircase landings shall be built entirely of brick, stone, iron or other hard. incombustible materials. No wood work or other fnfammable material shall be used in any of the partitions, furrings. or ceilings in any such fre-proof buildings, ex- cepting, however, that the doors and windows and their frames, the trims, the castings, the interior finish when filled solid at the back with fre-proof material. and the floor boards and sleepers directly hereunder, may be of wood. In all flre-proof buildings the follow ing rules shall be observed:
 1. All cast-iron wrought-iron, or rolled steel columns shall be made true and smooth at both ends and shall rest on iron or steel bed plates, and have iron or steel cap plates. which shall also be made true. All iron or steel trimmer beams, headers and tail beams shall be suitably framed and connected to- gether, and the iron girders, columns, beams, trusses and all other iron work of all floors and roofs shall be strapped, bolted. anchored and connected together and to the walls, in a strong and substantial manner. All con- nections of rolled beams with each other and with girders shall be in conformity with the practice of the Carnegie, Trenton, Phoenix,