Abstract
Traffic sign boards are often blown away by strong winds, seriously endangering the safety of vehicles and pedestrians. To increase their resistance to strong winds, sign boards are perforated. Using computational fluid dynamics simulations, the wind load resistance of traffic signs with holes was optimised. By comparing the solutions to different turbulence models with empirical results, it was found that the simulation results of the re-normalisation group (RNG) model have the smallest error. Therefore, the RNG model is used to simulate the wind load of traffic sign boards with different perforation diameters and different hole spacings under different wind speeds. By analysing the wind pressure distribution on the surface of the perforated traffic sign board, the perforation scheme for different regions of the sign board under different wind loads was obtained. The results show that reasonable perforation diameters and hole spacings can reduce the wind load and improve the wind load resistance of sign boards. This study provides decision-makers with useful information for installing traffic signs in areas affected with strong winds, thereby improving the wind resistance of traffic signs and ensuring traffic safety.
Highlights
As an important part of road infrastructure, traffic signs convey essential information in terms of guidance, restrictions, warnings, or instructions to drivers and pedestrians [1]
Aiming at the problem of insufficient wind load resistance of traffic sign boards, some experts and scholars analysed the force of the support structure under wind load by optimising the support structure of the sign board [3,4,5,6,7,8]
With the xaxis representing the width of the marker, the x-axis coordinate corresponding to the centre of the hole is x = 3
Summary
As an important part of road infrastructure, traffic signs convey essential information in terms of guidance, restrictions, warnings, or instructions to drivers and pedestrians [1]. The theoretical basis of the research is fluid mechanics, and the methods of collecting experimental data are wind tunnel experiments and computational fluid dynamics (CFD) simulation experiments. Wind tunnel experiments, and CFD are the three methods of wind load research. CFD Simulation study on wind load of perforated traffic sign board are more authentic and credible and form the basis for studying fluid mechanics problems. In this study, the empirical formula for wind load on a traffic sign board was adopted to verify the CFD simulation results and adjust the simulation parameters so that the model achieves the desired effect. Through Fluent fluid analysis software, the turbulence model with the minimum error was adopted to carry out wind load simulations for traffic sign boards with different perforation diameters. The optimised perforated traffic sign can improve the wind load resistance of the sign board and reduce the strength requirements of the supporting parts to some extent, making it easier to design and install the structure
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