Design for Fatigue of Structural Steel
Design life of 25 years, crane is heavily loaded 3x per day x 5 days a week = 19,500 cycles (fatigue check . not technically . required, < 20,000 cyles) Design life of 50 years, crane is heavily loaded 15x per shift x 2 shifts x 5 days a week = 390,000 cycles (fatigue check . required!!)
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