. Electric railway journal . Diameter of Pipe,Inches COLLAPSING STRENGTH OF CORRUGATEDIRON CULVERT PIPE No. 16 gage, ; No. 14 gage, ; No. 12 gage, ;No. 10 gage, Then grouping the collapsing pressures of each gageof metal for all diameters we have the results shownin Table II. Here the maximum variation of calculatedfrom actual collapsing pressure was about per cent. So, again, in the development of the formula it wasassumed that the strength of the pipe varied with the 915 thickness of the metal, and in this it checks with boththe Lloyds and the United States formulas for
. Electric railway journal . Diameter of Pipe,Inches COLLAPSING STRENGTH OF CORRUGATEDIRON CULVERT PIPE No. 16 gage, ; No. 14 gage, ; No. 12 gage, ;No. 10 gage, Then grouping the collapsing pressures of each gageof metal for all diameters we have the results shownin Table II. Here the maximum variation of calculatedfrom actual collapsing pressure was about per cent. So, again, in the development of the formula it wasassumed that the strength of the pipe varied with the 915 thickness of the metal, and in this it checks with boththe Lloyds and the United States formulas for corru-gated furnaces. The effect of diameter then remainedthe only variable to be analyzed for its effect on thestrength. Taking the No. 10 gage pipe having 3/±-in. corruga-tion for the 12-in. and 24-in. pipe as a basis, we findthe strength to be as 2 to 1 approximately. While thecorresponding ratios between the 24-in. and 48-in. pipe. 0 5 10 15 20 25 30 35 4-0 45 50 55- 60Diameter of Pipe,Inches CALCULATED COLLAPSING STRENGTH OF NO. 10 GAGE CORRU-GATED IRON CULVERT PIPE are approximately as 4 to 1. It was merely a matterto divide the product of the thickness and the depth ofcorrugation by 2 with an exponent of 0 for a 12-in. pipe,1 for a 24-in. pipe and 2 for a 48-in. pipe. Such anexponent is to be found in the expression: D — 12 As both the depth of corrugation and the thicknessof metal were less than 1 in., it was necessary to providea constant that, used as a coefficient, should place thecalculated pressure for the 12-in., No. 10 gage pipeapproximately at the actual collapsing pressure. Thispressure was 630 lb. for the pipe with % in. depth ofcorrugation. Then 630 ~ ( X ) = 5960. Hence5960 was taken as the coefficient. The formula thusdeveloped is as given: _ 5960 X C X T ~ 2(^s) In which P = collapsing pressure in pounds per square = depth of corrugation in = thickness of metal in inc
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