Force spectrum transplanting method for contribution of signature turbulence to bridge section buffeting force

ZHOU Haowei, ZHANG Zhitian

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (13) : 306-314.

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (13) : 306-314.

Force spectrum transplanting method for contribution of signature turbulence to bridge section buffeting force

  • ZHOU Haowei, ZHANG Zhitian
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Abstract

In order to study the contribution of signature turbulence to buffeting force on blunt body sections, taking the double-girder bridge section as an example, aerodynamic force of a double-girder section is investigated by computational fluid dynamics (CFD) simulation. Five types of oncoming flow fields, a smooth and 4 turbulent ones, are considered to investigate their effects on significance turbulence induced aerodynamic loads. An aerodynamic spectrum transfer method is put forward to consider the effects of signature turbulence, and hence obtain the adapted quasi-steady aerodynamic load spectrum including the signature turbulence effects. Based on this and taking a sectional model as an example, the effects of signature turbulence on buffeting responses are studied. The results reveal that, the signature turbulence adds peaks to the load spectra, resulting in higher buffeting responses than those from the quasi-steady theory. As the turbulent intensity increases, the effects of signature turbulence attenuate progressively and finally disappear completely.

Key words

CFD / double-girder section / signature turbulence / spectrum transfer method / buffeting

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ZHOU Haowei, ZHANG Zhitian. Force spectrum transplanting method for contribution of signature turbulence to bridge section buffeting force[J]. Journal of Vibration and Shock, 2024, 43(13): 306-314

References

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