Problem 1-81/1-82/1-83/ Engineering Mechanics Materials.

Engineering mechanics problem with solution.
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1–81. The steel pipe is supported on the circular base plate
and concrete pedestal. If the normal failure stress for the steel is (sfail ) 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 (sfail ) con = 25 MPa.

1–82. The steel pipe is supported on the circular base plate and concrete pedestal. If the thickness of the pipe is t = 5 mm and the base plate has a radius of 150 mm, determine the factors of safety against failure of the steel and concrete. The applied force is 500 kN, and the normal failure stresses for steel and concrete are (sfail ) st = 350 MPa and
(sfail ) con = 25 MPa, respectively.

1–83. The 60 mm * 60 mm oak post is supported on the pine block. If the allowable bearing stresses for these materials are soak = 43 MPa and spine = 25 MPa , determine the greatest load P that can be supported. If
a rigid bearing plate is used between these materials, determine its required area so that the maximum load Pcan be supported. What is this load?