Wind forces on single and shielded angle members in lattice structures

Prud׳homme, Simon; Légeron, Frédéric; Laneville, A.; Tran, Minh Khue

doi:10.1016/j.jweia.2013.10.003

Cited by 22 publications

(7 citation statements)

References 5 publications

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“…and deck furniture (handrails, wind shields, etc.) (BS 5400, 2000; GB50009, 2012; JTG/T D60-01-2004, 2004) which has been widely used in bridge engineering; (3) A local approach to calculate aerodynamic forces on each member and corrected by taking into account the effects of shielding and angle of attack (Prud’homme et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The influences of other important factors, such as wind angle of attack, truss topology, and aspect ratio (width to height ratio), are usually ignored. Finally, for the local method proposed by Prud’homme et al (2014), though taking into consideration the issues of wind angle of attack, shielding effect, and aspect ratio, it is still in its initial stage and needs further development to adequately address the interference effects from steel angle members and deck constructions.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of aerodynamic forces for truss bridge-girders based on wind tunnel test and kriging surrogate model

Liang

et al. 2021

Advances in Structural Engineering

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This study presents an investigation to quantify the aerodynamics of truss bridge-girders via wind tunnel test and kriging surrogate model. Currently, the conventional methods documented in design specifications only take into consideration the mean drag force at null attack angle. To gain an in-depth understanding on the aerodynamics of truss bridge-girders, experiments on simplified bridge-girder models with various geometric parameters were carried out in uniform flow. A total of 15 truss bridge-girder models with aspect ratio (the ratio of width to height) B/D = 1.0, 1.3, 1.6, 1.9, and 2.2, solidity ratio (the ratio of projected to envelope areas) Φ = 0.20, 0.25, 0.30, 0.35, and 0.40, and two typical truss topologies (Warren and Pratt trusses) were examined in the most concerned range of wind angle of attack α = [–6°, 6°]. These truss bridge-girder models cover most of the high-speed railway bridges widely used in China. Experimental results show that the truss topology has limited effects on the aerodynamics of truss bridge-girders, whereas the effects of α, B/D, and Φ are significant. Based on these wind tunnel results, the ordinary kriging surrogate model was utilized to approximate the aerodynamics of truss bridge-girders. In using this model, aerodynamic force values for test cases can be interpolated with zero variance and uncertainties in unsampled design zones where geometric parameters can be quantified with Gaussian variance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantification of aerodynamic forces for truss bridge-girders based on wind tunnel test and kriging surrogate model

Liang

et al. 2021

Advances in Structural Engineering

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“…These tests are the base of the present design codes. For steel latticed structures, there are two main methods (Prud’homme et al, 2014): (1) a global method in which the wind forces are evaluated directly on a whole truss or part of a truss and (2) a local method in which the wind forces are evaluated on each member separately. The first method has been adopted by most codes.…”

Section: Introductionmentioning

confidence: 99%

“…Reynolds number mismatches between the model-scale section tests and the prototype tests had a small influence on both the individual member drag forces and the overall group effect. Prud’homme et al (2014) evaluated the aerodynamic loads on simplified latticed structures by taking into account the force on each individual member and the effect of Reynolds number, edge shape, and thickness ratio in smooth and turbulent flows. The results showed that Reynolds numbers between 14,000 and 38,100 have a negligible effect on drag coefficients, and turbulence generally reduces the drag coefficients.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on wind force coefficient of a truss arch tower with multiple skewbacks

et al. 2020

Advances in Structural Engineering

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A truss arch tower is a large-span arch structure with multiple skewbacks. This tower is made of a large number of members with unique form, and contains more than five kinds of geometric features. The wind forces and the corresponding wind effects on the truss arch tower are notably complicated. In this study, wind tunnel tests were conducted to evaluate the wind forces on the steel latticed structure mentioned above using the high-frequency base balance technique. Four segmental models, including one arch foot of main truss, two arch feet of sub-truss, and one arch crown of main truss were tested in nominally smooth flow. The drag forces were measured and compared with several existing codes, including the British, American, and Chinese codes. The incidence angle effects and the interference effects on the drag coefficient were analyzed. The testing results showed that the direction of the wind forces has a marked effect on the whole truss tower. The solidity ratio and layout of the segmental models, including the cross-section and the centerline of the members, have critical effects on the drag forces.

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“…But for the purpose of introducing a practicable method to simulate the vibrations under skew winds, using global coefficients would be an expedient effective to obtain general features of dynamic responses. More precise alternative, of course, is to measure the dynamic coefficients of every segment, or to establish the wind force model for shielded members(Prud'homme et al, 2014).…”

mentioning

confidence: 99%

Experimental and numerical study on the responses of a transmission tower to skew incident winds

Deng

Duan

et al. 2016

Journal of Wind Engineering and Industrial Aerodynamics

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A study on a lattice suspension tower in a four-span transmission line system subjected to skew incident wind forces is presented via experimental and numerical approaches. The purpose of this work is to investigate the response features of the tower especially to the wind not incoming along the structure's principle axes. At the geometric scaling of 1: 80, the aeroelastic model is manufactured with scaled rigidity, mass, area projection and frequency. Wind tunnel tests on the model, with and without conductors, are conducted at a variety of incident angles. Then numerical simulations are applied quasi-steadily to figure out an analytical way of interpreting and supplementing experimental results. Such quasi-steady method is generally valid since the tested aerodynamic damping ratios, though scattered, roughly meet the quasi-steady formulae.

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Wind forces on single and shielded angle members in lattice structures

Cited by 22 publications

References 5 publications

Quantification of aerodynamic forces for truss bridge-girders based on wind tunnel test and kriging surrogate model

Quantification of aerodynamic forces for truss bridge-girders based on wind tunnel test and kriging surrogate model

Experimental study on wind force coefficient of a truss arch tower with multiple skewbacks

Experimental and numerical study on the responses of a transmission tower to skew incident winds

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