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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.2 (1970) No.4 ■■■■■■■■■■■■■■■■■■■ |
| 鉄骨建家の実大模型振動実験 Vibration Test of Steel Structure Model 荻野 英也(Hideya Ogino) 高田 千一郎(Senichiro Takada) |
| 要旨 : 床および壁にALC板を使用した４層１スパンの鉄骨建家に大型起振機により，強制振動を与え，各部の破壊状況を観察するとともに，周期，モード・減衰定数の変化を調べた。強制力を大きくするに従い，建家の周期，減衰定数は大きくなるが，鉄骨骨組は大きな変形に対しても十分な靱性を持ち，急激な剛性の低下は，みとめられない。ALC板などの２次部材は6.0〜7.0c/sで破壊現象が発生する。6.0〜7.0c/sの１次共振振動数を持つ鉄骨建家については十分な注意を必要とする。 |
| Synopsis : A test was made to study the vibration properties of a four-storied bay-framed steel structure, floored and walled with autocraned lightweight concrete. In this test the model structure was vibrated by means of an oscillator of big capacity, to make it possible to observe the development of destruction of each part of the structure and investigate the natural frequency, vibration mode, damping coefficient and their relation to the unbalanced moment of the oscillator. As an increased force was added, the natural frequency and damping coefficient of the model structure also increased, but no great decrease in stiffness was noted in the steel frames themselves, proving that they possessed sufficient toughness against major deformations. In contrast, the secondary structural materials, including the autocraned lightweight concrete panels, were observed to suffer destruction under the resonance oscillation frequency of 6.0 to 7.0c/s. Therefore, a considerable precaution should be taken as to the steel-framed buildings with primary resonance oscillation frequency ranging from 6.0 to 7.0c/s. |
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