Sage Journals: Discover world-class research

Abstract

Two-dimensional flow fields were simulated in an actively-controlled wind tunnel by using multiple fans and active-vibration grids. On coming flow features and aerodynamic loads on a streamlined bridge deck section model were measured simultaneously. Experimental result shows that the spatial coherences of on coming flows and aerodynamic loads are both influenced by on coming flow features. Longitudinal and vertical flow features have different effects on spatial coherence of aerodynamic loads. The shape of the spatial coherence function versus frequency curve does not always satisfy an exponential law, but sometimes shows an inverse form in the low-frequency region. A new empirical model is proposed and compared with the traditional exponential one. This new model shows good performance in reflecting spatial coherences of both oncoming flows and aerodynamic forces under different flow conditions.

Keywords

actively-controlled wind tunnel two-dimensional flows bridge deck aerodynamic loads spatial coherences

Get full access to this article

View all access options for this article.

References

Cao

S.Y.

Nishi

Kikugawa

and Matsuda

(2002). “Reproduction of wind velocity history in A multiple-fan wind tunnel”, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 90, No. 12–15, pp. 1719–1729.

Davenport

A.G.

(1961). “The spectrum of horizontal gustiness near the ground in high winds”, Quarterly Journal of the Royal Meteorological Society, Vol. 87, No. 372, pp. 194–211.

Deaves

D.M.

and Harris

R.I.

(1978). A Mathematical Model of the Structure of Strong Winds, CIRIA Report 76. Construction Industry Research and Information Association, London, UK.

Harris

R.I.

(1970). “The nature of the wind”, Proceedings of the Seminar on the Modern Design of Wind Sensitive Structures, Institution of Civil Engineers, London, UK.

Kristensen

Panofsky

H.A.

and Smith

S.D.

(1981). “Lateral coherence of longitudinal wind components in strong winds”, Boundary Layer Meteorology, Vol. 21, No. 2, pp. 199–205.

Larose

G.L.

(1997). The Dynamic Action of Gusty Winds on Long-Span Bridges, PhD Thesis, Technical University of Denmark, Lyngby, Denmark.

Larose

G.L.

(2003). “The spatial distribution of unsteady loading due to gusts on bridge decks”, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 91, No. 12–15, pp. 1431–1443.

Larose

G.L.

and Mann

(1998a). “Gust loading on streamlined bridge decks”, Journal of Fluids and Structures, Vol. 12, No. 5, pp. 511–536.

Larose

G.L.

Tanaka

Gimsing

N.J.

and Dyrbye

(1998b). “Direct measurements of buffeting wind forces on bridge decks”, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 74–76, pp. 809–818.

10.

T.T.

Zhao

Cao

S.Y.

Y.J.

and Miyagi

(2013). “Investigations of aerodynamic effects on streamlined box girder using two-dimensional actively-controlled oncoming flow”, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 122, pp. 118–129.

11.

Mann

(1994). “The spatial structure of neutral atmospheric surface-layer turbulence”, Journal of Fluid Mechanics, Vol. 273, pp. 141–168.

12.

Matsumoto

Chen

and Shiraish

(1994). “Buffeting analysis of long span bridge with aerodynamic coupling”, Proceedings of the 13th National Symposium on Wind Engineering, Japan Association for Wing Engineering, Japan.

13.

Nagao

Utsunomiya

Noda

and Oshima

(2003). “Basic study on spatial correlations of fluctuating lifts acting on plates”, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 91, No. 12–15, pp. 1349–1361.

14.

Nishi

Kikugawa

Matsuda

and Tashiro

(1997). “Turbulence control in multiple-fan wind tunnels”, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 67–68, pp. 861–872.

15.

Ropelewsky

C.F.

Tennekes

and Panofsky

H.A.

(1973). “Horizontal coherence of wind fluctuations”, Boundary Layer Meteorology, Vol. 5, No. 3, pp. 353–363.

16.

Solari

(1987). “Turbulence modeling for gust loading”, Journal of Structural Engineering, ASCE, Vol. 113, No. 7, pp. 1550–1569.

17.

Solari

and Piccardo

(2001). “Probabilistic 3-D turbulence modelling for gust buffeting of structures”, Probabilistic Engineering Mechanics, Vol. 16, No. 1, pp. 73–86.

18.

Zhao

Cao

S.Y.

Y.J.

and Cao

F.C.

(2011). “Investigation of aerodynamic loading effects on typical streamline cross-section under active turbulence-generated conditions”, Proceedings of the 13th International Conference on Wind Engineering, Amsterdam, Netherlands.

Investigation of Spatial Coherences of Aerodynamic Loads on a Streamlined Bridge Deck in an Actively-Controlled Wind Tunnel

Abstract

Keywords

Get full access to this article

References