Anchor Bolt Check

Maximum Tension on Anchor Bolt

Nu = 4MJK N b)(Bc)] — 0.9(De)/N b

= 4[(1.6)(262.94)]/[(244 453)] — 0.9(77.24)/24 = 12.58 tons

Load factors shall be in accordance with Table 3.24, load combination 4

Maximum Shear on Anchor Bolt

Vu at base top of the grout = 1.6(20.3) = 32.48 tons

Check whether shear load can be taken by friction between the base of the vessel and the top of the grout.

Pu = Mu/NLa + 0.9(De)

Choose La = 2/3BC as a conservative measure La = 2/3 x 4.53 = 3.0 m

Pu = 1.6 x (262.9/3) + 0.9 x (77.24) = 209.73 tons

Vf = P = (0.55)(209.73) = 115.4 tons

cpVi = (0.75)(115.4) = 86.55 > 32.48 tons

Therefore, anchor bolts are not required to resist shear.

Projected Concrete Failure Area

Often, several iterations were required to determine that D = 4.9 m would not provide enough projected concrete failure area to resist the maximum tensile load on the anchor, Nu, equal to 12.58 tons, regardless of whatever embed­ment depth, ldh, was used. To save space, these trial calculations are not shown here. Reinforcing steel either should be added to transfer the tensile load from the anchor bolts to the pedestal or the pedestal diameter should be increased. This second alternative is shown here.

Try increasing D to 5.4 mm.

Updated: 31 августа, 2015 — 1:41 пп