高硬度ゴムを用いた3段ユニット間柱型粘弾性ダンパーシステムの開発と制振特性の簡易評価法

摘要

A new vibration control system is proposed for residential houses. This system is a three-unit viscoelastic damper system which consists of two (upper and lower) rigid units and a damper unit including various rubber dampers supported by braces. The control system can absorb sufficient energy through the rubber damper. The ratio of the actual damper deformation to the interstory drift of the frame is introduced as a criterion to measure the damping performance and effectiveness of this system and it is shown that the proposed vibration control system has a high level of damping performance and effectiveness. A simplified earthquake response evaluation method is also proposed for the frame including the proposed control system. To verify the validity of the proposed vibration control system, a free-vibration experiment is conducted and some examples using the proposed simplified response evaluation method are presented.%戸建住宅や集合住宅では，交通振動や常時風等の外乱により発生する，絶対加速度振幅で20mm/s~2程度，層間変位振幅で0.1mm程度の水平微振動が，居住性の観点からしばしば問題とされる．例えば，木造2階建て戸建住宅の水平方向の1次固有振動数は2.5Hz～5Hz程度，鉄骨造3階建て戸建住宅の水平方向の1次固有振動数は3Hz程度であるのに対し，交通振動によって引き起こされる地盤振動の卓越振動数も3Hz付近にあるため，これらの戸建住宅や，1次固有振動数が3Hz付近にある鉄筋コンクリート造低層集合住宅では，しばしば交通振動による不快な振動が問題とされる．