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A hanging jumper beam of a transmission tower is adopted as a countermeasure against a short fault of jumper conductors under strong winds. However it is thought that the hanging jumper beam may cause... the vibration of transmission tower members due to its weight when the hanging jumper beam starts to vibrate under strong winds. The authors have conducted an excitation test of a strain transmission tower with the hanging jumper beam to comprehend the dynamic behaviors of the hanging jumper beam. As a result, it was found that a big pendulum vibration of the hanging jumper beam generates twice the natural frequencies of the normal and tangential components of the beam vibration which induce a vibration of the tower in the direction of conductors. Moreover, some results of our wind response measurement revealed that the interactions between the hanging jumper beam and the tower components were more complicated than under a light wind due to the effects of cross arms, tower, conductors and insulators.show more
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