Fragility Analysis of Transmission Towers Subjected to Downburst Winds
A downburst is a typical local highly intensive wind all over the world, which is attributed to be the main cause of wind damage to transmission lines in inland areas worldwide. The collapse accidents of transmission towers under the downburst still occur every year. Therefore, it is of great signif...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-08-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/16/9167 |
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| author | Chao Zhu Qingshan Yang Dahai Wang Guoqing Huang Shuguo Liang |
| author_facet | Chao Zhu Qingshan Yang Dahai Wang Guoqing Huang Shuguo Liang |
| author_sort | Chao Zhu |
| collection | DOAJ |
| description | A downburst is a typical local highly intensive wind all over the world, which is attributed to be the main cause of wind damage to transmission lines in inland areas worldwide. The collapse accidents of transmission towers under the downburst still occur every year. Therefore, it is of great significance to assess the safety of the transmission towers under downbursts. The motivation of the present study is to propose a fragility assessment method for transmission towers under the action of a downburst considering the uncertainty of wind-resistance capacity and the stochastic wind load effect. First, the downburst wind field of the transmission tower with different wind attack angles and different radial distances is simulated according to the mixed stochastic model. Then, random material characteristic samples are generated by the Latin hypercube sampling technique and applied to establish uncertain finite element models for transmission towers. Next, the static nonlinear buckling analysis is carried out by numerical methods to determine the ultimate capacity under the downburst wind load. The parameter analysis of different wind attack angles and radial distances between the downburst and the tower is conducted to determine the most unfavorable location of the maximum response. The failure mode of the transmission tower and the probabilities of the initial failure main members are summarized. Finally, the fragility curves of the transmission tower under the downburst and the atmospheric boundary layer (ABL) wind are compared. The results show that the maximum response is located at <i>R = 1.6D</i>. Most of the initial buckling members are located close to the first section of the tower. The fragility curves of the tower under the downburst are more dangerous than the ABL wind with the attack angle increasing from 0° to 90°. Furthermore, considering the probability model of intensity and direction of the downburst and based on the previous fragility analysis, the collapse probability of the transmission tower caused by the downburst is obtained. By probability analysis of the parameters, including layout conditions, different directions, and different wind speeds, it is found that the most favorable arrangement is 157.5°, and the most unfavorable arrangement is 112.5°. |
| first_indexed | 2024-03-11T00:09:25Z |
| format | Article |
| id | doaj.art-3c33934a549746cabd8d9619f0748ee7 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T00:09:25Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-3c33934a549746cabd8d9619f0748ee72023-11-19T00:05:29ZengMDPI AGApplied Sciences2076-34172023-08-011316916710.3390/app13169167Fragility Analysis of Transmission Towers Subjected to Downburst WindsChao Zhu0Qingshan Yang1Dahai Wang2Guoqing Huang3Shuguo Liang4School of Civil Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Civil Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Civil Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Civil and Building Engineering, Wuhan University, Wuhan 430072, ChinaA downburst is a typical local highly intensive wind all over the world, which is attributed to be the main cause of wind damage to transmission lines in inland areas worldwide. The collapse accidents of transmission towers under the downburst still occur every year. Therefore, it is of great significance to assess the safety of the transmission towers under downbursts. The motivation of the present study is to propose a fragility assessment method for transmission towers under the action of a downburst considering the uncertainty of wind-resistance capacity and the stochastic wind load effect. First, the downburst wind field of the transmission tower with different wind attack angles and different radial distances is simulated according to the mixed stochastic model. Then, random material characteristic samples are generated by the Latin hypercube sampling technique and applied to establish uncertain finite element models for transmission towers. Next, the static nonlinear buckling analysis is carried out by numerical methods to determine the ultimate capacity under the downburst wind load. The parameter analysis of different wind attack angles and radial distances between the downburst and the tower is conducted to determine the most unfavorable location of the maximum response. The failure mode of the transmission tower and the probabilities of the initial failure main members are summarized. Finally, the fragility curves of the transmission tower under the downburst and the atmospheric boundary layer (ABL) wind are compared. The results show that the maximum response is located at <i>R = 1.6D</i>. Most of the initial buckling members are located close to the first section of the tower. The fragility curves of the tower under the downburst are more dangerous than the ABL wind with the attack angle increasing from 0° to 90°. Furthermore, considering the probability model of intensity and direction of the downburst and based on the previous fragility analysis, the collapse probability of the transmission tower caused by the downburst is obtained. By probability analysis of the parameters, including layout conditions, different directions, and different wind speeds, it is found that the most favorable arrangement is 157.5°, and the most unfavorable arrangement is 112.5°.https://www.mdpi.com/2076-3417/13/16/9167downbursttransmission towersfragilitynonlinear buckling analysisatmospheric boundary layer wind |
| spellingShingle | Chao Zhu Qingshan Yang Dahai Wang Guoqing Huang Shuguo Liang Fragility Analysis of Transmission Towers Subjected to Downburst Winds Applied Sciences downburst transmission towers fragility nonlinear buckling analysis atmospheric boundary layer wind |
| title | Fragility Analysis of Transmission Towers Subjected to Downburst Winds |
| title_full | Fragility Analysis of Transmission Towers Subjected to Downburst Winds |
| title_fullStr | Fragility Analysis of Transmission Towers Subjected to Downburst Winds |
| title_full_unstemmed | Fragility Analysis of Transmission Towers Subjected to Downburst Winds |
| title_short | Fragility Analysis of Transmission Towers Subjected to Downburst Winds |
| title_sort | fragility analysis of transmission towers subjected to downburst winds |
| topic | downburst transmission towers fragility nonlinear buckling analysis atmospheric boundary layer wind |
| url | https://www.mdpi.com/2076-3417/13/16/9167 |
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