GRAIlSr PEESSURES IN STORAGE BINS. 6 



V L 



Values for the pressure factors j\ and j^ may be tabulated for dif- 



77 



ferent values of j^- (See Table 1.) 



Table 1. — Pressure factors for wheat in round or other regular concrete bins. 

 (Pounds per square foot in diameter.) 



H 



V 



L 



H 



V 



L 



D 



D 



D 



D 



D 



D 



0.1 



4.76 



2.86 



2.3 



44.97 



26.98 



.2 



9.06 



5.44 



2.4 



45.46 



27.28 



.3 



12.96 



7.77 



2.5 



45.89 



27.53 



.4 



16.48 



9.88 



2.6 



46.29 



27.77 



.5 



19.67 



11.80 



2.7 



46.64 



27.98 



.6 



22.56 



13.53 



2.8 



46.96 



28.18 



.7 



25.17 



15. 10 



2.9 



47.25 



28.34 



.8 



27.53 



16.52 



3.0 



47.51 



28.50 



.9 



29.67 



17.80 



3.1 



47.75 



28.64 



1.0 



31.61 



18. P6 



3.2 



47.96 



28.77 



1.1 



33.36 



' 20.01 



3.3 



48.16 



28.89 



1.2 



34.94 



20.96 



3.4 



48.33 



28.99 



1.3 



36.37 



21.82 



3.5 



48.49 



29.09 



1.4 



37.67 



22.60 



3.6 



48.63 



29.18 



1.5 



38.84 



23.30 



3.7 



48. 76 



29.26 



1.6 



39.90 



23.94 



3.8 



48.88 



29.33 



1.7 



40.87 



24.52 



3.9 



48. 99 



29.39 



1.8 



41.74 



25.04 



4.0 



49.08 



29.45 



1.9 



42.52 



25. 51 



5.0 



49.66 



29.79 



2.0 



43.23 



25.94 



6.0 



49.88 



29.92 



2.1 



43.88 



26.32 



7.0 



49.95 



29.97 



2.2 



44.46 



26.67 



10.0 



49.99 



29-99 



For use of this table see example 1, page 10. 



EXPLANATION OF PLATE I. 



The values given by Table 1 are plotted on Plate I, curve 1, showing 

 the variation of vertical pressures, and curve 3, the variation of lateral 

 pressures. Similar curves, 2 and 4, are plotted to show the variation 

 of pressures when k is assumed equal to 0.3. It is to be noted that 



7 

 values for y^ when ]c = 0:S, are to be taken from the upper line of 



figures, curve 2 being drawn to a horizontal scale of one-half the scale 



of curve 1 . Curve 4, however, showing the variation of values for j. 



when ]c = 0.3 is drawn to the same scale as curves 3 and 1, and the 

 values are to be read from the lower line of figures. 

 It is evident from the curves that : 



A. After a height is reached of 3 to 4 times the diameter there is 

 but little increase in the unit pressures, the additional weight going 

 directly into the walls as a vertical load. 



B. There is considerable difference in the values obtained for the 

 vertical pressures for different assumed values of Ic; the lateral pres- 

 sures, however, are affected very little. 



