ON DAMAGE FACTOR OF SHEAR PANEL DAMPER

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  • TAMAI Hiroyuki
    Prof., Dept. of Engineering, Faculty of Engineering, Nagasaki Univ., Dr. Eng.

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  • せん断パネルダンパーの累積損傷度について
  • センダンパネルダンパー ノ ルイセキ ソンショウド ニ ツイテ

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Abstract

A shear panel dampers, consisting of stiffeners and a panel surrounding four flanges are used as aseismic hysteretic damper for buildings in Japan. Cracks can easily form in a shear panel damper when the panel undergoes shear buckling during cyclic loading caused by a severe earthquake. Shear buckling can be detected by checking the maximum deformation angle. For relatively thick panel, when width-to-thickness ratio is large, the damper's plastic deformation capacity can be evaluated from the maximum deformation angle. However, when width-to-thickness ratio is relatively small, very-low-cycle fatigue life is essential for relatively thick panel to predict the damper's usage limit because failure pattern changes where cracks forms the welding between panel and flanges. Fatigue life relation for shear thick panel damper, which has parameters such as normalized width-to-thickness ratio and deformation-angle is presented. Also the method for predicting fatigue life under a severe earthquake is presented. To show the validity of the prediction expression, cyclic loading tests of shear panel damper were reviewed and performed to verify the expression. The applicability of the method for predicting fatigue life of the damper is confirmed through non-stationary cyclic loading tests. These results showed the validity and effectiveness of the expressions and the method

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