Evaluation of the crane track irregularities influence on stresses in cranes with rigid suspensioned load

摘要

At the movement of cranes with rigid suspensioned load on track with occasional deviations in vertical plane oscillations are occurred. At their investigation dynamic model of crane with six given masses was used. For evaluation of root-mean-square movement values and stresses occurred in construction during motion on track with sinusoid profile and amplitude 1 mm at first mass movement were found. After that transfer functions were determined. It allowed to realize transition from spectral irregularity densities to spectral movements and stress densities. Stress dispersions were obtained by their integration over all possible frequencies spectrum. The obtained stresses values are comparable with stresses occurred at speeding up of crane bridge.