Measurement and application of the aerodynamic admittance function for a box-girder bridge

Walshe, D E; Wyatt, T.A.

doi:10.1016/0167-6105(83)90024-7

Cited by 25 publications

(5 citation statements)

References 2 publications

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“…It has been used by several researchers, e.g. Walshe & Wyatt (1983), Sato et al (1994), and Bogunovic Jacobsen (1995). However, the de"nition of what one really measures is original and has been veri"ed experimentally.…”

Section: Introductionmentioning

confidence: 98%

“…The cross-sectional aerodynamic admittance can either be approximated as in Liepmann (1952), Davenport (1962), Irwin (1977), using for example analytical expressions derived for a thin airfoil (Fung 1969), or measured as in Lamson (1957), Holmes (1975), Walshe & Wyatt (1983), Jancauskas (1983), Jancauskas & Melbourne (1986), Kawatani & Kim (1992), Sankaran & Jancauskas (1992), Larose (1992), Sato et al (1994) and Bogunovic Jacobsen (1995), or evaluated indirectly (Grillaud et al 1991). Liepmann's approximation to Sears' function is the most commonly used form of the lift aerodynamic admittance of a thin airfoil in fully correlated gusts with sinusoidal #uctuations (Liepmann 1952):…”

Section: Introductionmentioning

confidence: 99%

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Experimental Determination of the Aerodynamic Admittance of a Bridge Deck Segment

Larose

1999

Journal of Fluids and Structures

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Experimental Determination of the Aerodynamic Admittance of a Bridge Deck Segment

Larose

1999

Journal of Fluids and Structures

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“…On the contrary, the technique for identifying the frequency domain force parameters (flutter derivatives and admittance functions) has been fully established, and a large data set is available now for a host of geometric configurations of bridge sections (e.g. References [14][15][16]). …”

Section: Aerodynamic Forcesmentioning

confidence: 99%

Aeroelastic forces and dynamic response of long‐span bridges

Lazzari

Vitaliani

Saetta

2004

Numerical Meth Engineering

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SUMMARYIn this paper a time domain approach for predicting the non-linear dynamic response of long-span bridges is presented. In particular the method that leads to the formulation of aeroelastic and buffeting forces in the time domain is illustrated in detail, where a recursive algorithm for the memory term's integration is properly developed. Moreover in such an approach the forces' expressions, usually formulated according to quasi-static theory, have been substituted by expressions including the frequency-dependent characteristics. Such expressions of aeroelastic and buffeting forces are made explicit in the time domain by means of the convolution integral that involves the impulse functions and the structural motion or the fluctuating velocities. A finite element model (FEM) has been developed within the framework of geometrically non linear analysis, by using 3-d degenerated finite element. The proposed procedure can be used to analyze both the flutter instability phenomenon and buffeting response. Moreover, working in the geometrically non-linearity range, it verifies the possibility of strongly flexible structures of actively resisting the wind loading.

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“…Approximation of h(t j −1 + t/2) can be simply obtained with instant velocity factor t j −1 and can thus be written as follows: Similarly, time domain expressions can be developed for buffeting force with rational approximation of mechanical admittance functions (e.g. References [4,28,29]).…”

Section: Extension Of Aeroelastic Derivatives In the Time Domainmentioning

confidence: 99%

Time domain modelling of aeroelastic bridge decks: a comparative study and an application

Lazzari

2005

Int. J. Numer. Meth. Engng

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SUMMARYThis paper has the purpose of describing, developing and comparing the formulae of aeroelastic forces in the time domain for the aerodynamic study of bridges. In particular, it considers the 'quasi-steady' formulation and the formulation 'derived from the extension of aeroelastic derivatives to the time domain' with the use of the recursive expression for the memory term. Both formulae are then applied to the analysis of 'stress ribbon' pedestrian bridges, aerodynamically similar to a thin airfoil immersed in a fluid. The thin airfoil theory is described and then extended to general coverage of bridge dynamics in order to identify the essential aeroelastic coefficients and derivatives. Different formulae are also compared with simplified theory of the aeroelastic issue frequency domain. Finally, this comparison, the obtained results and all input data are recorded and can be used as a possible benchmark for other theoretical formulations.

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Measurement and application of the aerodynamic admittance function for a box-girder bridge

Cited by 25 publications

References 2 publications

Experimental Determination of the Aerodynamic Admittance of a Bridge Deck Segment

Experimental Determination of the Aerodynamic Admittance of a Bridge Deck Segment

Aeroelastic forces and dynamic response of long‐span bridges

Time domain modelling of aeroelastic bridge decks: a comparative study and an application

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