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 Investiagtation of optimal barrier heights in long-span cable-supported bridges for flutter instability
Tác giả hoặc Nhóm tác giả: Van My Nguyen, Quang Son Le
Nơi đăng: Hội nghị Cơ học toàn quốc lần thứ X; Số: ISBN: 878-604-913-719-8;Từ->đến trang: 378-385;Năm: 2018
Lĩnh vực: Khoa học; Loại: Báo cáo; Thể loại: Trong nước
TÓM TẮT
Long-span cable-supported bridges are very highly flexible, light weight, and sensitive with respect to the dynamic loads, especially wind loads. Among aerodynamic instabilities, flutter instability has become the most important problem. In the wind resistance design for long-span bridges, the onset of flutter should be entirely eliminated. As mentioned from literature, the flutter stability of long-span cable-supported bridges may be enhanced through the selection of the deck geometry or the implementation of the passive and/or active control equipments. In this respect, the barrier height is also an important factor affecting to the flutter instability of the bridges. This study presents a parametric study that is based on the computational wind engineering (CWE) method to obtain optimal barrier heights of the bridges. The sectional analysis of the box girder attached with different barrier heights is simulated; so aerodynamic derivatives and critical flutter velocities are determined. As a result, the optimal domain of barrier height is recommended in order to increase flutter stability for long-span cable bridges
ABSTRACT
Long-span cable-supported bridges are very highly flexible, light weight, and sensitive with respect to the dynamic loads, especially wind loads. Among aerodynamic instabilities, flutter instability has become the most important problem. In the wind resistance design for long-span bridges, the onset of flutter should be entirely eliminated. As mentioned from literature, the flutter stability of long-span cable-supported bridges may be enhanced through the selection of the deck geometry or the implementation of the passive and/or active control equipments. In this respect, the barrier height is also an important factor affecting to the flutter instability of the bridges. This study presents a parametric study that is based on the computational wind engineering (CWE) method to obtain optimal barrier heights of the bridges. The sectional analysis of the box girder attached with different barrier heights is simulated; so aerodynamic derivatives and critical flutter velocities are determined. As a result, the optimal domain of barrier height is recommended in order to increase flutter stability for long-span cable bridges
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