2019.07.18
R&D WORKS Vol. 06
Highly efficient core rod vibration control system
Vibration control technology that uses a core rod to increase efficiency.
Vibration control technology uses devices to absorb the forces generated by the shaking of a skyscraper, protecting the building. Typically, such devices are distributed across each floor. However, this time, by incorporating a rigid core-like framework into the building, we have developed a technology that allows the vibration control devices to be concentrated at the bottom. The core is intended to be the core of a skyscraper, such as that allocated to elevator shafts. This vibration control system can reduce the number of devices by 1/3 to 1/4, while improving the efficiency of the devices by 5 times.
The concept of core rod vibration damping
Where should vibration control devices such as dampers and laminated rubber that reduce the energy of shaking be placed most efficiently? After considering this issue, we developed a new vibration control system technology called a core rod frame. Vibration control devices are effective when placed in locations where the shaking and displacement of building components due to earthquakes is greatest.
So we tried inserting a "core rod," a rigid structural component that is independent of the surrounding area, into the center of the lower part of the building. Because the core rod is rigid, it does not deform much itself, and the difference in displacement with the surrounding areas is concentrated at the bottom. The relative displacement that occurs on each floor is transmitted to the bottom. Placing the vibration control device at the point where the displacement with the surrounding area is greatest increases efficiency.
Analytical model of a highly efficient core rod vibration control system.
構造モデルを一つ挙げてみましょう。地上30階鉄骨造、地下3階鉄骨鉄筋コンクリート造のビルを想定します。低層部、地下3階から地上5階までに、芯棒にあたる剛性の高いコンクリート系の架構を挿入します。この芯棒は周囲の構造と切り離しクリアランスをとって動けるようにしています。同時に底面には支承材として積層ゴムを取り付け、基礎とも縁が切れています。したがってビルが揺れるとき、この芯棒と周囲の鉄骨造の揺れ幅に差ができます。そこに粘性系オイルダンパーを設置するのです。ダンパーは制振装置として働き、揺れ幅の差による揺れを減衰してゆきます。このモデルを、制振装置を基準階に分散配置する一般モデルと比較するとき、粘性系ダンパーの必要台数は1/5。つまり装置が5倍有効に働いているという結果が出ました。
Although there is a gap between the core rod and the surrounding area, by using the core rod area as the core of the building, planning is not unreasonable. For example, if it is used as a mid-to-high-rise elevator shaft, there is no need to connect floors at the lower levels. It is also suitable for the use of recent skyscrapers, where the 5th floor and below are used for commercial and facility purposes.
However, a major challenge was how to connect the rigid core rod of the lower floors to the flexible steel structure of the mid- and upper-floor sections. Stress would be concentrated at the connection. To address this issue, rigid steel dampers were installed in the upper middle section of the core rod. The idea is that a rigid core of steel structure extends continuously above the stiffest core rod. No clearance is required in the damper section on this floor, allowing for continuous planning. It plays a role in appropriately transmitting the force of an earthquake to the core rod in the mid- and upper-floor sections.
- The height of the core pole should be between 1/6 and 1/2 of the height of the building, preferably at least 30m.
Highly efficient core rod vibration control system
[Patent registration] Registration number: Patent No. 64908621 *For details, press release reference
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