박스거더단면의 풍응답특성에 미치는 공기역학적 제진장치의 효과에 관한 실험적 연구
Experimental Study on the Effects of Aerodynamic Improvements on the Wind-Induced Response of a Box-Girder Section
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In this study, the effects of various aerodynamic improvements are investigated on the wind-induced response of a PSC box girder section with aspect ratio of 5.5 through wind tunnel tests. As the improvements, three types of triangled fairing and a flap are considered. The maximum amplitude of torsional vortex-induced is increased by attachment of right triangled fairing(A1, A2) in the range of positive angle, however the critical velocity for torsional flutter is increased by inequilateral triangled fairing(A2). In the case of regular triangled one(B), maximum vortex-induced amplitude is increased and the critical velocity for flutter becomes decreased, which is not suitable to improve the aerodynamic stability of basic section. The flap suppresses vortex-induced oscillation and increases critical flutter velocity. Therefore, it can be noted that flap is most effective mitigation measure among considered improvements in this study.
Abstract
In this study, the effects of various aerodynamic improvements are investigated on the wind-induced response of a PSC box girder section with aspect ratio of 5.5 through wind tunnel tests. As the improvements, three types of triangled fairing and a flap are considered. The maximum amplitude of torsional vortex-induced is increased by attachment of right triangled fairing(A1, A2) in the range of positive angle, however the critical velocity for torsional flutter is increased by inequilateral triangled fairing(A2). In the case of regular triangled one(B), maximum vortex-induced amplitude is increased and the critical velocity for flutter becomes decreased, which is not suitable to improve the aerodynamic stability of basic section. The flap suppresses vortex-induced oscillation and increases critical flutter velocity. Therefore, it can be noted that flap is most effective mitigation measure among considered improvements in this study.
참고문헌 (12)
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