Effects of K&uuml;ssner-function-based aerodynamic admittance models on the buffeting responses of a long-span bridge

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (20) : 131-139.

Effects of Küssner-function-based aerodynamic admittance models on the buffeting responses of a long-span bridge

ZHANG Zhitian，CHEN Tianle，WU Changqing

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Abstract

The Küssner-type function was adopted to simulate the buffeting forces and aerodynamic admittances (AAs) in the time domain.Wind tunnel tests were conducted with the elementary scheme of a long-span bridge to obtain the AAs of its main girder.Based on the experimentally obtained AAs and the Sears function, which was derived from thin airfoil theories, the corresponding Küssner functions were obtained via parametric identification.Finally, the buffeting responses of the concerned bridge were computed in the time domain with the Küssner functions identified from the Sears AAs, experimentally obtained AAs, and without consideration of any, respectively.The analytical results show that the Küssner function method is able to transfer frequency-domain-based AAs to time-domain flexibly, and therefore benefits inclusion of various nonlinearities in dynamic FEM simulations.Results based on the numerical example indicate that exclusion of the AAs results in extraordinarily large buffeting responses.When AAs are included, the buffeting results based on the Sears function are significantly greater than those based on experiments.Therefore, it is appropriate to employ experimentally-based AAs to replace the extensively used the Sears function for buffeting analyses of long-span bridges, even for those stiffened with flat box-girders.

Key words

bridge / Küssner function / buffeting / time-domain / test / aerodynamic admittance

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ZHANG Zhitian，CHEN Tianle，WU Changqing. Effects of Küssner-function-based aerodynamic admittance models on the buffeting responses of a long-span bridge[J]. Journal of Vibration and Shock, 2019, 38(20): 131-139

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