I only need the answer to the question 15.6 but as far as it is referred to the

Question

I only need the answer to the question 15.6 but as far as it is referred to the 15.5, I have it typed here as well,.

Q15.6: The Pile described in problem 15.5 is to be made of A36 steel, which has Fy=250 MPa. Determine the maximum allowable driving stress using the criterion described in Section 12.3, then use the wave equation analysis results in Figure 15.4 to determine if the driving stresses are acceptable.

Here is the 15.5 question: An HP 10x53 pile is to be driven with a Delmag D-12 hammer in a soil profile described in Figure 15.4.The required allowable downward load capacity is 500 kN. Using the bearing graph in Figure 15.4 and the appropriate factor of safety from Table 13.1, determine the minimum required blow count.

The book's name: Foundation design pribciples Author: Coduto

The figure 15.4 is added.

Explanation / Answer

fa = (ecc) (HDF) (Fy)/LF

LF = load factor = 2

= AISI = 0.85

HDF = hidden damage factor = 1.19

ecc = eccentricity factor (0.91)

fa = (0.85)(0.91)(1.19)(250)/2 = 115.058

Driving stress = 1.1 of fy = 1.1 x 250 = 275

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