A circular raft foundation of 20 m diameter and 1.6 m thick is provided for a tank that applies a bearing pressure of 110 kPa on sandy soil with Young's modulus, ES' = 30 MPa and Poisson's ratio, υS = 0.3. The raft is made of concrete (EC = 30 GPa and υC = 0.15). Considering the raft as rigid, the elastic settlement (in mm) is

A circular raft foundation of 20 m diameter and 1.6 m thick is provide

1.	A circular raft foundation of 20 m diameter and 1.6 m thick is provided for a tank that applies a bearing pressure of 110 kPa on sandy soil with Young's modulus, ES' = 30 MPa and Poisson's ratio, υS = 0.3. The raft is made of concrete (EC = 30 GPa and υC = 0.15). Considering the raft as rigid, the elastic settlement (in mm) is
A.	50.96
B.	53.36
C.	63.72
D.	66.71
Answer» C. 63.72

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