An experimental study of the damage degrees to ancient building timber caused by lightning strikes

作者：Li, Jingxiao; Zhang, Xiaoqing; Li, Jing; Li, Rujian; Qian, Muhui; Song, Pingjian

来源：Journal of Electrostatics, 2017, 90: 23-30.

DOI：10.1016/j.elstat.2017.08.009

• Ancient building timber
• Lightning strike
• Water content
• Damage degree
• Fire

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 mu s 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.

• 出版日期2017-12
• 单位中国科学院理化技术研究所; 北京交通大学; 北京市气象局