[Abstract]
Lightning activity is one of the most unpredictable natural events that can cause significant damage to buildings and cause loss of lives. Predicting the number of times that a building is likely to be struck by lightning in a year is important to ensure the safety of people and the building itself. In this paper, we present a simplified method for calculating the expected number of lightning strikes on a building. The proposed method is easy to use and can be helpful for building owners, architects, and engineers to assess the risk of lightning strikes to the building.
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[Keywords]
lightning strikes, building safety, lightning protection
[Introduction]
Lightning strikes are a frequent phenomenon during thunderstorms and can cause severe damage to buildings. Every year, buildings are struck by lightning leading to power outages, equipment damage, and risk to human life. Therefore, predicting the expected number of lightning strikes on buildings has become increasingly important. This paper presents a simplified method for calculating the expected number of lightning strikes on a building in a year.www.52iii
[Methodology]
The proposed method takes into account the building’s height and the average frequency of thunderstorms in the area. The expected number of lightning strikes on the building can be calculated using the following equation:
N=H*(F/S)
Where N is the expected number of lightning strikes, H is the height of the building in meters, F is the average frequency of thunderstorms in the area per year, and S is the average area of lightning flashes in meters squared.
To obtain F, the average number of thunderstorm days per year can be multiplied by the average duration of thunderstorms in hours. The value obtained is then divided by 365 days to get the average frequency of thunderstorms per year.
To obtain S, the average peak currents of lightning flashes during thunderstorms can be used. The peak currents for a highly conductive building can range from 200 kiloamperes to 400 kiloamperes. The average area of lightning flashes for a highly conductive building can be calculated as S=I^(-0.8)*100.
丝绵机[Results and Discussion]
Using the proposed method, the expected number of lightning strikes on a building can be calculated. For example, a 50-meter high building located in an area with an average frequency of 15 thunderstorms per year and average peak current of 200 kiloamperes will experience N=50*(15/365)*((200)^(-0.8))*100=0.45 lightning strikes per year.
The simplified method proposed in this paper can be useful for building owners, architect
s, and engineers to evaluate the risk of lightning strikes in their building design and for installing lightning protection systems. The calculated expected number of lightning strikes can also help in insurance purposes for the building.
船用倾斜仪[Conclusion]
In this paper, we presented a simplified method for calculating the expected number of lightning strikes on a building. The method takes into account the building’s height and the average frequency of thunderstorms in the area. The proposed method is easy to use and can be useful for building owners, architects, and engineers to evaluate the risk of lightning strikes in their building design and for installing lightning protection systems.
1. Rakov, V. A., & Uman, M. A. (2003). Lightning: physics and effects. Cambridge University Press.
2. Mekhiche, M., & Salem, R. (2017). Simplified models for estimating the risk of lightning
strikes to tall buildings. Journal of Building Engineering, 10, 175-182.
3. National Fire Protection Association. (2018). NFPA 780: Standard for the Installation of Lightning Protection Systems. National Fire Protection Association.[Further Discussion] 性引诱
It is important to note that the simplified method proposed in this paper provides an estimate of the expected number of lightning strikes on a building. This estimate can be affected by various factors such as the building’s location, topology, and the presence of nearby lightning rods or other conductive elements. Therefore, it is recommended to consult with lightning protection experts for more accurate evaluations.
In addition, the importance of lightning protection systems cannot be overstated. Lightning rods, grounding systems, and surge protectors are essential components of a comprehensive lightning protection system, which can significantly reduce the risk of lightning strikes to a building. It is crucial to install these systems in accordance with the relevant safety codes and standards, such as the National Fire Protection Association’s NFPA 780.
Moreover, building design can also play a role in reducing the risk of lightning strikes. For instance, avoiding tall buildings in areas with high thunderstorm frequency can significantly reduce the potential for lightning strikes. Architectural features such as sloping roofs, rounded edges, and use of nonconductive materials can also decrease the likelihood of lightning strikes.
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