Abstract
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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