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steel .pla.t~ t V)

~~--_._- - ._

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.f

(bl Vertical Column or Skirt

(aJ Typical.Plan & Outside Views

(c) Flat Bottom Tank (dl Conical Skirt

Fig. 10. Anchor-bolt Chairs_

Fig. 11. Assumed top-plate beam.

anchor bolt with respect to the shell. Except for the case where a continuous ring is used at the top of chairs, maximum stress occurs in the vertical direction and is a combination of bending plus direct stress. Formulas which follow are approximations, based on the work of Bijlaard.

s - Pe [1.32 Z .031 ] (461-7 1 43ah1 +-=

-'-R-l- + (411h 2l:J33 y Rl

48

Table 4. Top-Plate Dimensions B...d on ."ellor.bolt .tr.nes up 10 12 ... lor l-l/2-;".-

PAGE 05.3:00 +966-a-3955188 A SAUDI TOYO - K. S. A

Note that the base plate or boltom is also subjected to this same horizontal force, except inward instead of outward. This is true even if a continuous ring is not used around the top of the cha irs - but it should never cause any very high stresses in the base, so we do not normally check it. However, it is a good thing to keep in mind in case you have a very light b