The steel pipe is supported on the circular base plate and concrete pedestal. If the normal failure stress for the steel is (ofai)st = 350 MPa, determine the minimum thickness t of the pipe if it supports the force of 500 kN. Use a factor of safety against failure of 1.5. Also, find the minimum radius r of the base plate so that the minimum factor of safety against failure of the concrete due to bearing is 2.5. The failure bearing stress for concrete is (o fail)con = 25 MPa. 500 kN -100 mm

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