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

Lazzari, Massimiliano

doi:10.1002/nme.1238

Cited by 17 publications

(4 citation statements)

References 18 publications

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“…As the crosssections considered in the design domain can be accepted as streamlined shapes, the quasi-steady theory formulation [10] can be applied to obtain the flutter derivatives from the aerodynamic coefficients of each shape. Therefore, under this assumption, the only required task is to obtain these aerodynamic coefficients.…”

Section: Aeroelastic Characterization Of a Single Box Deckmentioning

confidence: 99%

“…Hence, from the aerodynamic coefficients given by the surrogate model for each pair of shape design variables (H, B), the flutter derivatives of each design can be obtained using the quasi-steady theory [10,24], following the sign convention shown in figure 8 and according to the following expressions,…”

Section: Aeroelastic Response By Means Of the Quasi-steady Theorymentioning

confidence: 99%

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The role of surrogate models in combined aeroelastic and structural optimization of cable-stayed bridges with single box deck

Montoya¹,

Hernández²,

Kusano³

et al. 2016

WIT Transactions on the Built Environment

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The aeroelastic phenomena represent a crucial issue in the design of long span bridges and their relevance grows as the length of the spans is increased, which is the current trend in these mega-structures. The search for the best performing deck cross-section, as well as the search of the most economic bridge design, are two of the most relevant goals for bridge designers. Hence, the pursuit of good aerodynamic performance of the bridge deck cross-section and the structural optimization of the bridge are destined to converge in a unified process to achieve more efficient bridge designs, given their interdependence. This paper presents an integrated methodology based on a surrogate-based optimization process to obtain an optimum bridge design considering structural and aeroelastic constraints. The deck cross-section used in this work is the well-known G1 section, in which two deck shape variables are considered. The aerodynamic behavior of the cross sections analyzed by the optimization algorithm is given by a surrogate model trained with a set of designs calculated with CFD techniques. The structural performance is analyzed by means of finite element analysis. The areas and prestressing forces of the stays and the deck shape and plate thickness are considered as design variables, and the optimization of the bridge is carried out by a gradient-based optimization algorithm.

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Section: Aeroelastic Characterization Of a Single Box Deckmentioning

confidence: 99%

Section: Aeroelastic Response By Means Of the Quasi-steady Theorymentioning

confidence: 99%

The role of surrogate models in combined aeroelastic and structural optimization of cable-stayed bridges with single box deck

Montoya¹,

Hernández²,

Kusano³

et al. 2016

WIT Transactions on the Built Environment

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“…A load defined by Equation (4), which is naturally suited for the frequency domain analysis, generally needs to be transformed in the time domain. Such transformation is not trivial (see for example Lazzari (2005)) and will not be discussed here. The interesting result is that Equation (4) can be substituted in the time domain by a relation of the type…”

Section: The Model Problemmentioning

confidence: 99%

Analysis of some partitioned algorithms for fluid‐structure interaction

Rossi

Oñate²

2010

Engineering Computations

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Purpose -The purpose of this paper is to analyse algorithms for fluid-structure interaction (FSI) from a purely algorithmic point of view. Design/methodology/approach -First of all a 1D model problem is selected, for which both the fluid and structural behavior are represented through a minimum number of parameters. Different coupling algorithm and time integration schemes are then applied to the simplified model problem and their properties are discussed depending on the values assumed by the parameters. Both exact and approximate time integration schemes are considered in the same framework so to allow an assessment of the different sources of error. Findings -The properties of staggered coupling schemes are confirmed. An insight on the convergence behavior of iterative coupling schemes is provided. A technique to improve such convergence is then discussed. Research limitations/implications -All the results are proved for a given family of time integration schemes. The technique proposed can be applied to other families of time integration techniques, but some of the analytical results need to be reworked under this assumption. Practical implications -The problems that are commonly encountered in FSI can be justified by simple arguments. It can also be shown that the limit at which trivial iterative schemes experience convergence difficulties is very close to that at which staggered schemes become unstable. Originality/value -All the results shown are based on simple mathematics. The problems are presented so to be independent of the particular choice for the solution of the fluid flow.

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“…This could also allow investigating the importance of the buffeting action in initializing the flutter of a given structure, e.g. Lazzari [14], or simulating the interaction of different cables subjected to different levels of stress.…”

Section: Fluid-structure Couplingmentioning

confidence: 99%

Fluid—structure coupling analysis and simulation of a slender structure

Vasallo¹,

Foces²,

Lorenzana³

2007

WIT Transactions on the Built Environment, Vol 92

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The analysis of the interaction between the flow and the fluid and an object represents a classical challenge for modern numerical techniques. Current work will concentrate on the case of bluff-body cross-sections featuring sharp corners and a clear predominance of the shape resistance over the friction resistance. For this category of structures the dynamic behaviour of the overall coupled system plays a very important role. In this work, the interest focuses on the behaviour of a beam structure subjected to a flow orthogonal to the beam axis. Under this assumption the flow at two points, at reasonable distance, will present little correlation, which allows to consider the flow at one point as uncoupled from the flow at other points along the same beam. This suggests the possibility of "slicing" the fluid domain in a number of independent two-dimensional planes on each of which the problem can be solved separately. Conceptually the solution on each slice will provide a force density acting on the beam, obtained by integrating the pressure of the fluid over the corresponding cross-section. This can be interpreted as a time-varying distributed load over the beam. The aeroelastic analysis of a slender beam is performed coupling a Navier Stokes Solver with the structural model. In the analysis of the structure is used a monodimensional structural model applicable to thin−walled composite beams, which can have either an open or closed profile with either a single-or multiplecell section. However, in the application example presented here, a steel chimney 90 meters tall is analyzed.

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

Cited by 17 publications

References 18 publications

The role of surrogate models in combined aeroelastic and structural optimization of cable-stayed bridges with single box deck

The role of surrogate models in combined aeroelastic and structural optimization of cable-stayed bridges with single box deck

Analysis of some partitioned algorithms for fluid‐structure interaction

Fluid—structure coupling analysis and simulation of a slender structure

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