Abstract
A damping device has been invented for catenary poles in order to reduce vibrations in overhead contact lines due to earthquakes or passing trains. The authors conducted theoretical response analyses on poles equipped with the damping device and vibration tests on full scale poles. The device is a sandwich structure consisting of steel plates and viscoelastic sheets and has a damping effect even on very slight movement. Confirmation has been obtained that theoretical results are almost identical to results from vibration tests on actual steel-pipe poles. Vibration tests also demonstrate that the damping device increases the loss factor by ten in comparison to a simple unequipped steel-pipe pole. In vibration tests on a concrete pole, the damping device reduces the maximum bending moment by approximately one half in comparison to a simple concrete pole.
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