Influence of Porosity on Drag Coefficient of Perforated Road Signs
To ensure the structural stability of road signs against strong gusts of wind, perforated road signs with sign boards perforated at regular intervals have been adopted for use in urban road infrastructure. However, ASCE 7-22 standards do not consider the drag coefficient of signs with low porosity,...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/1/502 |
| _version_ | 1797626247080050688 |
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| author | Hongki Sung Kyusoo Chong Wonseok Chung |
| author_facet | Hongki Sung Kyusoo Chong Wonseok Chung |
| author_sort | Hongki Sung |
| collection | DOAJ |
| description | To ensure the structural stability of road signs against strong gusts of wind, perforated road signs with sign boards perforated at regular intervals have been adopted for use in urban road infrastructure. However, ASCE 7-22 standards do not consider the drag coefficient of signs with low porosity, i.e., less than 30%. Therefore, here, computational fluid dynamics (CFD) analysis was performed to analyze the drag coefficient of perforated road signs with a porosity of less than 30%. The aspect and clearance ratios, which are the width/height ratio of a perforated road sign and the height of the perforated road sign/its distance from the ground, respectively, were set as parameters. Subsequently, the drag coefficient of perforated road signs with a porosity of 30% was calculated, and the effect of porosity and wind speed on the drag coefficient of perforated road signs was analyzed. Results show that the drag coefficient of perforated road signs decreased as the porosity increased, with a drag coefficient reduction effect of up to 0.85 times. Furthermore, perforated road signs with a high clearance ratio exhibited significant decreased drag coefficient. For perforated road signs, the drag coefficient does not show a clear correlation with wind speed. |
| first_indexed | 2024-03-11T10:07:40Z |
| format | Article |
| id | doaj.art-3718f94d619a4c899795c03988572170 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T10:07:40Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-3718f94d619a4c899795c039885721702023-11-16T14:58:01ZengMDPI AGApplied Sciences2076-34172022-12-0113150210.3390/app13010502Influence of Porosity on Drag Coefficient of Perforated Road SignsHongki Sung0Kyusoo Chong1Wonseok Chung2Department of Civil Engineering, Kyung Hee University, Yongin-si 17104, Republic of KoreaDepartment of Future & Smart Construction Research, Korea Institute of Civil Engineering and Building Technology, Goyang-si 10223, Republic of KoreaDepartment of Civil Engineering, Kyung Hee University, Yongin-si 17104, Republic of KoreaTo ensure the structural stability of road signs against strong gusts of wind, perforated road signs with sign boards perforated at regular intervals have been adopted for use in urban road infrastructure. However, ASCE 7-22 standards do not consider the drag coefficient of signs with low porosity, i.e., less than 30%. Therefore, here, computational fluid dynamics (CFD) analysis was performed to analyze the drag coefficient of perforated road signs with a porosity of less than 30%. The aspect and clearance ratios, which are the width/height ratio of a perforated road sign and the height of the perforated road sign/its distance from the ground, respectively, were set as parameters. Subsequently, the drag coefficient of perforated road signs with a porosity of 30% was calculated, and the effect of porosity and wind speed on the drag coefficient of perforated road signs was analyzed. Results show that the drag coefficient of perforated road signs decreased as the porosity increased, with a drag coefficient reduction effect of up to 0.85 times. Furthermore, perforated road signs with a high clearance ratio exhibited significant decreased drag coefficient. For perforated road signs, the drag coefficient does not show a clear correlation with wind speed.https://www.mdpi.com/2076-3417/13/1/502perforated road signdrag coefficientporositywind speed |
| spellingShingle | Hongki Sung Kyusoo Chong Wonseok Chung Influence of Porosity on Drag Coefficient of Perforated Road Signs Applied Sciences perforated road sign drag coefficient porosity wind speed |
| title | Influence of Porosity on Drag Coefficient of Perforated Road Signs |
| title_full | Influence of Porosity on Drag Coefficient of Perforated Road Signs |
| title_fullStr | Influence of Porosity on Drag Coefficient of Perforated Road Signs |
| title_full_unstemmed | Influence of Porosity on Drag Coefficient of Perforated Road Signs |
| title_short | Influence of Porosity on Drag Coefficient of Perforated Road Signs |
| title_sort | influence of porosity on drag coefficient of perforated road signs |
| topic | perforated road sign drag coefficient porosity wind speed |
| url | https://www.mdpi.com/2076-3417/13/1/502 |
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