| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an effective and proper vibration reduction mechanism of a beam, which can also secure a beam through hole without any hindrance by a simple constitution. <P>SOLUTION: A short-span cantilever beam 8, which has a base end fixed to a column 1 joined to a main body beam 2 or an end of the main body beam and which has a leading end provided as a free end, is provided. The cantilever beam is juxtaposed with the main body beam in a vertically and relatively vibratable manner in the lateral portion of the main body beam. A rotary inertia mass damper 3 is interposed between the leading end of the cantilever beam and the main body beam, and a natural frequency of an additional vibration system comprising the rotary inertia mass damper and the cantilever beam is synchronized with a natural frequency of the main body beam as a main vibration system. The cantilever beam is made of a truss material. A leaf spring 11 as an additional spring for adjusting the natural frequency of the additional vibration system is interposed together with the cantilever beam between the rotary inertia mass damper and the main body beam or the cantilever beam. <P>COPYRIGHT: (C)2012,JPO&INPIT |
