Damping device for primary vibration mode of steel pipe column and damping type steel pipe column

摘要

PPROBLEM TO BE SOLVED: To provide a primary mode vibration damper that damps the primary mode vibrations, and a vibration damping type steel tube pole applicable to the damping of all the primary, secondary and tertiary mode vibrations. PSOLUTION: The primary mode vibration damper is installed near the top of a lighting pole. It comprises a container housing one to a plurality of storage chambers each in the shape of a rectangular tube and a globe accommodated in each of these rectangular-tube chambers in the way that the globe can horizontally move within the chamber. The globe size is adjusted so that clearance between the storage chamber wall and the globe surface is within 10 to 100 mm. PCOPYRIGHT: (C)2008,JPO&INPIT