An experimental study of the damage degrees to ancient building timber caused by lightning strikes |
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| Affiliation: | 1. Disaster Prevention Center, Beijing Meteorological Bureau, Beijing 100089, China;2. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China;3. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;1. Division of Electromagnetic Engineering, School of Electrical Engineering, KTH Royal Institute of Technology, Stockholm, Sweden;2. Department of Austrian Lightning Detection and Information System, Austrian Electrotechnical Association, Vienna, Austria;1. Department of Electrical Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea;2. Department of Fire Protection and Engineering, Kangwon National University, 346, Hwangjo-gil, Dogye-eup, Samcheok-si, Kangwon-do, 25949, Republic of Korea;3. Technology Support Department, Korea Electrotechnology Research Institute, 10-12, Bulmosan-ro, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51543, Republic of Korea;1. School of Engineering and Physical Science, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK;1. National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom;2. Chalmers University of Technology, Göteborg S-412 96, Sweden;3. Linköping University, Linköping S-581 83, Sweden |
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| Abstract: | Lightning strikes are one of the main natural causes of damages to ancient buildings, and have attracted a great deal of attention to the problem of lightning strike disasters. In this study, the lightning strike damage mechanism of ancient building timber and the related damage degrees are investigated, based on the representative timber materials. A lightning-strike simulation device with a 10/350 μs lightning current waveform was adopted for the experiments. The experimental results showed that the lightning strike damages to ancient building timber mainly included timber heating caused by lightning arc heat and current, as well as the air shock wave effects of the lightning, which led to various effect modes under different conditions. The correlations between the damage degree of timber and the water content of timber, timber thickness, as well as the lightning current intensity, are obtained. The current peaks of lightning and the timber water content are the main external and internal causes which influence the damage degrees of ancient timber. |
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| Keywords: | Ancient building timber Lightning strike Water content Damage degree Fire |
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