Original Article
Abstract
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Purpose: Since the coupled flutter instability may lead to the collapse of stiffened girder, its stabilization is the most important issue for the feasibility of long-span bridges. The clarification of coupled flutter mechanism is indispensible for the effective stabilization of the catastrophic oscillation. Method: In this study, the generation mechanism of coupled flutter instability for rectangular sections is examined based on the complex eigenvalue analysis and aeroelastic energy method. Result: It is concluded that the bluff rectangular section with the aspect ratio of 5 (B/D=5) is classified into damping-driven flutter type, and that relatively slender rectangular sections (B/D=8~20) is stiffness-driven flutter type. Conclusion: In this study, the generation mechanism of coupled flutter instability for rectangular sections are investigated based on complex eigenvalue analysis and aeroelastic energy, which could be applied to the further development of coupled flutter stabilizaton of various girder section shapes in long-span bridges.
연구목적: 연성 플러터는 고풍속대에서 발생되는 공력 불안정 현상으로서, 플러터 발현을 한계풍속 이하에서 억제하는 것이 장대교량의 계획 및 설계단계에서 가장 신중히 검토되어야 할 사항이다. 장대교량의 플러터 발현을 억제하기 위해서는 보강거더 단면의 플러터 메커니즘을 분석하여야 한다. 연구방법: 본 연구에서는 다양한 변장비를 갖는 구형 단면(Rectangular Sections)을 대상으로 복소고유치 해석(Complex Eigenvalue Analysis) 및 공탄성 에너지 방법(Aeroelastic Engergy Method)을 적용하여 연성플러터 발현 특성을 검토하였다. 연구결과: 변장비 5인 구형단면은 감쇠비례항에 의한 에너지 성분(Damping-Driven Energy)이 플러터 발현을 유발하였고, 변장비 8~20의 구형단면은 강성비례항에 의한 에너지 성분(Stiffness-Driven Energy)이 플러터 발현을 유발함을 확인하였다. 결론: 공탄성 에너지 방법을 적용하여 다양한 변장비를 갖는 구형단면의 플러터 발현 유형을 분석하였고, 이러한 기법을 다양한 단면형상에 적용하여 플러터 발현유형 분석 및 플러터 안정화 방안을 수립할 수 있을 것이다.
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- Publisher :The Korean Society of Disaster Information
- Publisher(Ko) :한국재난정보학회
- Journal Title :Journal of the Society of Disaster Information
- Journal Title(Ko) :한국재난정보학회논문집
- Volume : 21
- No :3
- Pages :558-570
- DOI :https://doi.org/10.15683/kosdi.2025.9.30.558
Journal of the Society of Disaster Information
