Given that 10" concrete filled reinforced steel pipe piles with an axial design load of 75 tons are the design requirment for a building foundation, and that the piles are closed end and driven to a depth of an average of 47', How does one calculate the required pipe wall thickness in order to resist any significant distortion (less than 10% of pipe diameter change. The soil is described as creamy, loose to dense, water logged, calcareous, gravelly silty sand limestone formation 'marl'. The SPT rod sank 2' with one blow. The underlying bedrock formation is a uneven, pitted, fractured coralline limestone. The ground water has also has high quantities of sulfates and chlorides. As a result, the design corrosion rate of the piles is estimated at 0.08 mm/year. The design calls for a minimum pipe wall thickness of 0.365 inches. Is this adequate?
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