The paper describes a series of tests which were carried out on three lattice-type electric overhead travelling (E.O.T.) cranes to determine the impulsive effects due to the sudden hoisting and lowering of loads. Dynamic strains were measured from electric-resistance strain-gauge recordings taken during the tests. The stresses computed from these strains are compared with values from a complete theoretical analysis and with values obtained from three approximate formulae. Finally, a method is proposed for the evaluation of the dynamic factor in design.
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References
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British Standards Institution1954 Report CR(MEE)6091 of B.S.I. Subcommittee on Maximum Permissible Stresses in Cranes.
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MadsenI. E.1941Assoc. Iron and Steel Eng. Yearbook, p. 531, ‘Report of Crane Girder Tests’.
