Engineering and Contracting . 5 10 15 ZO DunirrR ofStack m Fect Fig. 2—Thickness of Plates. tion to resist the moment due to wind pressure, for anyfiber stress, f, and any efliciency. The unit stress at any section due to the weight of thestack above the section is, W 490TDHT s = = = (7) 24tDT 144tDTTherefore the total unit stress in the plate at any sec-tion is given by S = PH- DT (8) It is evident from Eijuation (8) that the stress due toweight of stack above the section may be neglected up toa height of over 400 ft. with an error of less than 1 percent. The weight of the lin
Engineering and Contracting . 5 10 15 ZO DunirrR ofStack m Fect Fig. 2—Thickness of Plates. tion to resist the moment due to wind pressure, for anyfiber stress, f, and any efliciency. The unit stress at any section due to the weight of thestack above the section is, W 490TDHT s = = = (7) 24tDT 144tDTTherefore the total unit stress in the plate at any sec-tion is given by S = PH- DT (8) It is evident from Eijuation (8) that the stress due toweight of stack above the section may be neglected up toa height of over 400 ft. with an error of less than 1 percent. The weight of the lining has been neglected as it isusually carried by the foundation. In special cases itmay be carried on angles riveted to the shell. In suchcases the weight should of course of included. 100 3eo\ DiAniTlR CF Stack 15 iO ^5 FFFICItnCYOFjOITIT: 5TRe55:l6,000lk^. 31 10 15 ^0 DlAnFTFR OF STACh ,n Fff t t5 30 Fig. 3—Tlnicl<ness of Plates. Taking P as 20 lb. per square foot, f as 16,000 lb. persquare inch, and E for double-riveted joints as , Equa-tion (6) gives the safe minimum thickness of plate fordouble-riveted horizontal joints as, T = H-/D (9) Taking E as , we have for the safe minimum thick-ness of plate for single-riveted horizontal joints, T = H-/D (10) Equations (9) and (10) have been plotted as shown inFigs. 2 and 3. These diagrams give the safe minimumthickness of plate to resist the moment due to windpressure for any given height and diameter. Example: Determine the thickness of plate for a stack16 ft. in diameter with double-riveted horizontal jointe,with a height of 240 ft. above the section. Enter Fig. 2 with the diameter at the top, and followdown the vertical line through 16 till the height, 240 reached, and read -^s-in. plate as the thickness required. For permanent structures Vj-in. is r
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
