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

Abstract

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.

Sequential aero‐structural optimization method for efficient bridge design

“…This ability is fundamental in emulation problems where the samples are scarce due to the substantial computational cost associated with their evaluation. Kriging surrogates are very popular in wind engineering applications given their capacity to deal with nonlinear responses and limited data, which is an intrinsic characteristic of bluff body aerodynamics when expressed as a function of the body shape (Bernardini et al., 2015; Cid Montoya, et al., 2018; Li, et al., 2021). Their use is also widespread in aerospace engineering for aerodynamic shape design and optimization applications (Lee et al., 2022; Raul & Leifsson, 2021).…”

Investigation of Vortex-Induced Vibration of Double-Deck Truss Girder with Aerodynamic Mitigation Measures

“…Rapid development in highway and rail transportation has resulted in new demands for cross-sea bridges, leading to an increase in the construction of double-deck truss girder bridges, such as the Xinhai Bay Bridge and the Beikou Bridge. Truss girders are widely used for road-rail bridges due to their high rigidity and ability to accommodate double bridge decks [4]. However, truss girders consist of numerous discrete components.…”

Research on Mechanism of Vortex-Induced Vibration Railing Effect of Double-Deck Large-Span Suspension Bridge

“…The increasing frequency of wind-induced disasters caused by climate change is placing greater demands on the safety of buildings. Double-deck truss girder suspension bridges are widely used in cross-river and cross-sea engineering due to their excellent spanning and transportation capabilities [1]. However, as the span increases, the structural stiffness, mass, and damping of suspension bridges decrease, leading to light flexibility and increased sensitivity to wind-induced vibrations [2].…”