| Autor: |
Quadri, Ajibola Ibrahim, Afolayan, Joseph Olasehinde |
| Zdroj: |
International Journal of Reliability and Safety; 2022, Vol. 16 Issue: 1 p189-217, 29p |
| Abstrakt: |
The collapse of electric tapered distribution concrete poles in Nigeria has increased tragically, leading to a recurrent power outage, vehicular traffic on the road and the death of innocents due to electrocution. Efforts to realise the service life of concrete poles have been waning. This report gives the investigation of several affected areas in Southwest Nigeria to mitigate the dominant damage under uncertain loading conditions. Data on the H-type tapered concrete poles were collected from a Nigerian electric distribution company and routed in the Concrete Model of Three Dimensions (COM 3D) for FEM analysis to better understand their behaviour under uncertain loading conditions. The level of reliability of the existing poles was probabilistically estimated. The dominant damage of the tapered concrete poles was necking at around 6 metres height; the FEM analysis also demonstrated conformity to the onsite damage scenario. The safety level of the poles determined by the recommendation of the Joint Committee on Structural Safety revealed that reliability decreased with increasing tapered geometry of the pole. The safety level is significantly critical at 6 metres and above. |
| Databáze: |
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