Question: A 7 . 8 cm diameter bridge tension member experiences a loading of 2 9 8 kN every time a car crosses the bridge. The

A 7.8 cm diameter bridge tension member experiences a loading of 298 kN every time a car crosses the bridge. The average traffic on the bridge is 1140 car/h, and the bridge has a design life of 10 yr. The S-N curves for several materials are shown. From the standpoint of fatigue, what material(s) could the truss bar be constructed from if the bridge is to safely reach the end of its design life?
For this part calculate the stress in MPa.

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