Abstract

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Title:: Buffeting response analysis of long-span bridge based on mode shapes of orthogonal DOF

Author(s):: DONG Rui; GE Yao-jun; YANG Yong-xin; WEI Jian-gang; (1.College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China; 2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)

Keywords:: bridge engineering; buffeting response; generalized mode shape; mode shapes of orthogonal DOF; conservation of energy

Abstract:: In order to analyze buffeting response of long-span bridge subject to gust wind, and solve the problem of complexity of traditional buffeting analysis method in which the generalized mode-shape is corresponding to one special state of the structure in space, a method based on mode shapes of orthogonal DOF is proposed in this paper. Based on dynamics of structure and wind tunnel experiment, this paper derived bridge’s buffeting response in form of mode-shapes of orthogonal DOF. Every mode-shape of orthogonal DOF could be expressed by one DOF of structure. According to the principle of conservation of energy, the generalized mode-shapes were instead by mode shapes of orthogonal DOF which simplified the buffeting analysis, and the concern dynamic responses could be obtained easily. Finally, the above method was used to calculate buffeting responses of a three span suspension bridge with main span of 800 m. The results show that the buffeting responses of long-span bridges are large and cannot be ignored in design.