8 A static load test has been conducted on a 60 ft long, 16 in square reinforced concrete pile which has been driven from a barg
e through 20 ft of water, then 31 ft into the underlying soil. Telltale rods A and B have been embedded at points 30 ft and 59 ft from the top of the pile, respectively. The data recorded at failure was as follows: Load at head = 139,220 lb, settlement at head = 1.211 in, settlement of telltale rod A = 1.166 in,settlement of telltale rod B = 1.141 in. Use the data from telltale rod A to compute the modulus of elasticity of the pile, then use this value and the remaining data to compute q′n and the average fn value.
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Solution :
Using the data table for refrigerant-134a at P = 120 psia
∴
For pressure, P = 20 psia
Change in temperature,
Now we find the quality,
The final energy,
Change in internal energy
= 38.09297-40.5485
= -2.4556