Transmission And Substation Foundations - Technical Design Manual

SECTION 7: DESIGN EXAMPLES

Design Example 5

Bending Moment (in-kips)

0

3

3

6

8

10

12

14

16

18

20

Depth (ft) 25 20 15 10 5 0

case 1*

Lateral Deflection vs Depth Figure 7-21

When looking at LPILE results, the goal is to have the deflection below what is allowable for the design and the moment less than 0.6Mp. These results show that two RS8625.188 wall pipes will carry the lateral load with an estimated 0.07” deflection and 20 kip-in of moment.

With the intended pipe shaft determined, HeliCAP (R) is now used to get a helix configuration and estimated installation depth for both the center piles as well as the guy anchors. Figure 7-22 is the Helicap® report for the center piles.

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