Study of Crane Structure Design Considering Fatigue under Service Load

抄録

To reduce the weight of crane structures, service loads (impact factors, frequency distributions of stresses etc.) of seven cranes (ladle cranes, ordinary overhead traveling cranes and an unloader) were measured. Meanwhile, program fatigue tests were conducted in accordance with the frequency distributions of stresses in the crane structures. A new standard for designing crane structures has been proposed, using the results obtained. Its main features are as follows: (1) separate examinations of fatigue strength and static strength, (2) expression of the allowable stresses for fatigue using the stress amplitude instead of the maximum stress, (3) use of factors which have clear physical meanings.