Question

4. The support towers of a suspension bridge are stabilized by anodized aluminum cables. Each cable is attached to the end of a cantilevered support bracket made of D6AC steel (tempered at 1000 F) that is fixed in a heavy approximately 200,000 lb, but under hurricane conditions may reach 500,000 lb due to wind loading Inspection has uncovered a crack with dimensions and location shown. Assuming that fatigue is not a potential failure mode, would you recommend that the cracked support be replaced (extremely costly) concrete foundation, as shown. The cable load, F, is or allow it to remain in service? Cable 60 12 in. Crack 8 in. Crack 3 in 2 in 0.35 in 0.070 in. deep 12 in. (b) Cross section of steel support through the cracked region. Fixed concrete foundation (a) Cable attachment and crack location details.

Answer 1

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