SHOP COST OF STRUCTURAL STEEL. 433 



Si.in.I.ini .nu<( tions should be used wherever possible, and special work should be 

 avuiili-tl. I 01 additional notes on ordering material, see Chapter XII. 



In i-stimatinu tin- ro>t >f plain mad rial in a finished structure the shipping weight from the 

 structural *hop is wanted. The cost of material f. o. b. the shop must therefore include the cost 

 of \vasti-, paint material, and tin- freight from the mill to the shop. The waste is variable but 

 a^ an average may be taken at 4 per cent. Paint material may be taken as two dollars per ton. 

 Tin- cost of plain material at the shop would be 



Average cost per Ib. f. o. b. mill, say 1-75 cts. 



Add 4 per cent for waste 07 



Add $2.00 per ton for paint material 10 



Add freight from mill to shop (Pittsburg to St. Louis) 225 " 



Total cost per pound f. o. b. shop 2.145" 



To obtain the average cost of steel per pound multiply the pound price of each kind of material 

 by the percentage that this kind of material is of the whole weight, the sum of the products will 

 be the average pound price. 



(c) COST OF SHOP LABOR. The cost of shop labor may be calculated for the different 

 parts of the structure, or may be calculated for the structure as a whole. The following costs 

 are based on an average charge of 40 cents per hour and include detailing and shop labor. The 

 cost of fabricating beams, channels and angles which are simply punched or have connection 

 angles loose or attached should be estimated on the basis of mill details, which see. 



SHOP COSTS OF STEEL FRAME BUILDINGS. The following costs of different parts 

 of steel frame office and mill structures are a fair average. 



Columns. In lots of at least six, the shop cost of columns is about as follows: Columns 

 made of two channels and two plates, or two channels laced cost about 0.80 to 0.70 cts. per Ib., 

 for columns weighing from 600 to 1,000 Ib. each; columns made of 4 angles laced cost from 0.80 

 to i.io cts. per Ib.; columns made -of two channels and one I-beam, or three channels cost from 

 0.65 to 0.90 cts. per Ib. ; columns made of single I-beams, or single angles cost about 0.50 cts. per 

 Ib.; and Z-bar columns cost from 0.70 to 0.90 cts. per Ib. 



Plain cast columns cost from 1.50 to 0.75 cts. per Ib., for columns weighing from 500 to 2,500 

 Ib., and in lots of at least six. 



Roof Trusses. In lots of at least six, the shop cost of ordinary riveted roof trusses in which 

 the ends of the members are cut off at- right angles is about as follows: Trusses weighing 1,000 Ib. 

 each, 1.15 to 1.25 cts. per Ib.; trusses weighing 1,500 Ib. each, 0.90 to i.oo cts. per Ib.; trusses 

 weighing 2,500 Ib. each, 0.75 to 0.85 cts. per Ib.; and trusses weighing 3,500 to 7,500 Ib. 0.60 to 

 0.75 cts. per Ib. Pin-connected trusses cost from o.io to 0.20 cts. per Ib. more than riveted trusses. 



Eave Struts. Ordinary eave struts made of 4 angles laced, whose length does not exceed 

 20 to 30 ft., cost for shop work from 0.80 to i.oo cts. per Ib. 



Plate Girders. The shop work on plate girders for crane girders and floors will cost from 

 0.60 to 1.25 cts. per Ib., depending upon the weight, details and number made at one time. 



TABLE IV. 



SHOP COST OF CIRCULAR AND RECTANGULAR BINS AND STAND-PIPES, NOT INCLUDING 



HOPPERS OR BOTTOMS. 



29 



