第24回風工学シンポジウム
Dec 5 - Dec 7, 2016日本建築学会 建築会館ホール
第24回風工学シンポジウム
Dec 5 - Dec 7, 2016日本建築学会 建築会館ホール
[30]LARGE AMPLITUDE AERODYNAMIC VIBRATION OF RECTANGULAR CYLINDER WITH A SIDE RATIO OF TWO WITH VARIOUS ANGLES OF ATTACK
○Yuta Sasaki1, Tomomi Yagi1, Masaaki Hamano2, Hisato Matsumiya3, Takashi Nishihara3(1.Kyoto University Graduate School of Engineering Department of Civil and Earth Resources Engineering, 2.Shutoko Metropolitan Expressway Company Limited , 3.Central Research Institute of Electric Power Industry Civil Engineering Research Laboratory)
Keywords:
coupled vibration,galloping,torsional flutter,quasi-steady aerodynamic force
In general, aerodynamic instabilities of bluff bodies are investigated in the very small amplitude region. In this study, a rectangular cylinder with a side ratio of two is used to investigate its large amplitude vibrations under three DOF condition with various angles of attack. Then, the various kinds of self-induced vibration with large amplitudes were observed. To understand these responses, the time history analyses using quasi-steady aerodynamic forces are applied. Then, the large amplitude vibrations can be divided into the two following phenomena. One is coupled 3DOF vibration which can be explained by the quasi-steady aerodynamic forces, and the other is coupled 3DOF vibration which caused by torsional 1DOF instability.