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Stress and Loads - largest permissible value load

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The cross section of the beam AD in Question 1 (attached).
1. Knowing the allowable normal stress due to bending +110 MPa in tension and -150 MPa in compression, find the largest permissible value load W if beam AB is not overstressed.

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The solution finds the largest permissible value load W if beam AB is not overstressed.

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