. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE M BULLETIN No. 789 ^^sj-i. Contribation from the Bureau of Markets, GEORGE LTVINGSTON, Acting J^T^'^^^U Washington, D. C. PROFESSIONAL PAPER October 6,1919 NOTES ON GRAIN PRESSURES IN STORAGE BINS. By W. J. Larkin, Jr., Consultant in Bulh Grain Handling. CONTENTS. Page. Introductton 1 Janssen's formula 1 Pressure factors for •vrheat in round or other regular concrete bins 2 Explanation of Plate 1 3 Determination of unit pressures in rectangular or ottier irregular bins 5
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE M BULLETIN No. 789 ^^sj-i. Contribation from the Bureau of Markets, GEORGE LTVINGSTON, Acting J^T^'^^^U Washington, D. C. PROFESSIONAL PAPER October 6,1919 NOTES ON GRAIN PRESSURES IN STORAGE BINS. By W. J. Larkin, Jr., Consultant in Bulh Grain Handling. CONTENTS. Page. Introductton 1 Janssen's formula 1 Pressure factors for •vrheat in round or other regular concrete bins 2 Explanation of Plate 1 3 Determination of unit pressures in rectangular or ottier irregular bins 5 Determination of unit pressures for various grains in bins of different materials 5 Horizontal reinforcing for cylindrical con- crete bins 6 Horizontal reinforcing for straight walls of concrete bins 7 Determination of vertical and lateral pres- sures in grain bins vrith horizontal reinforc- ing for cylindrical concrete tanks by means of Platen 10 Appendix 14 Selected list of publications on the pressure of stored grain 15 INTRODUCTION. The formula derived by Janssen for the determination of the vertical and lateral pressures of grain in bins is one commonly used by grain, elevator engineers. Most engineers, in their calculations, have also made use of a table of values similar to the one here given, by means of which the unit pressures are more quickly and easily determined (see Table 1). In this bulletin are given rules for the more advantageous application of this table, together with addi- tional tables and graphical charts which should further facilitate the designing of grain bins. JANSSEN'S FORMULA.! In Janssen's formula the following nomenclature is used: A = area of bin in square feet. P = perimeter of bin in feet. jB = hydraulic radius of bin= p Note.—This bulletin is of interest to engineers, particularly those having occasion to design grain storage bins. 1 For the derivation of Janssen's formula together with descriptions and results of diflerent experiments to
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