Page 28 - Unit2.docx
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Figure 3-8 calculated positions of N.A
3. Draw both neutral axis till they cross each other at point c. (see figure 3.9) and
establish the lever arm distance, Y, so that we can calculate the moment M, about C.
Pile inclination 4:2 ⇒ Y = (0.75)4 - 0.6 = 2.4m
where 0.75 m is the location of N.A of raking piles from e o or from the N.A Of the
vertical piles.
∴ ∑ M =0⇒ Q(X) - H(Y) = 3000(0.25) - 250(2.4) = 250kNm
4. Establish the angle α and calculate sin, cos, and tangent of the angle α
The inclination 4:2 ⇒ α = 24.04°
tanα = 0.25
sinα = 0.24
cos.α = 0.97
