Title Design of Stub for Transmission Line Towers Mechanical Engineering Screw Building Engineering 8.0 MB 26
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What is Stub?

The anchoring arrangement of transmission tower legs

consisting of inclined angle (in the same slope as that

of the tower leg) with bearing cleats at the end, all

embedded in the concrete foundation, is called Stub-

cleat arrangement or simply “STUB”.

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Design of Stub…Contd…

Cleat Strength Check:

Compression force for cleat design = 0.75 x 86551 = 64913 kG

Tension force for cleat design = 0.75 x 65068 = 48801 kG

Cleat thickness t = 0.7 cm Cleat length b = 30 cm.

Root radius r = 0.85 cm.

Yield stress of HT cleat fy = 3569 kG/cm
2.

fck = 204 kG/cm
2

x = t x = 0.7 x = 2.685 cm

Cleat strength for single cleat

P = 1.19 x fck x b x (t + r + x/2) = [1.19 x 204 x 30 x (0.7 + 0.85 + 2.685/2)] kG

= 21052 kG

Total cleat strength for 4 nos. of cleats = 21052 x 4 = 84208 kG >

Compression/tension force for cleat design, hence OK.

.

.

1/2

ck
1.19f

y
f

 1/2

1.19x204

3569