Disaster characteristics of long-duration ground motion and its effects on electric power facilities
(2.State Grid Jiangsu Electric Power Design Consulting Co., Ltd., Nanjing, China 210008)
(3.State Grid Jiangsu Electric Power Engineering Consulting Co., Ltd., Nanjing, China 210008)
(4.MOE Key Laboratory of Soft Soils and Geoenviromental Engineering, Zhejiang University, Hangzhou, China 310058)
(5.Institute of Geotechnical Engineering, Zhejiang University, Hangzhou, China 310058)
【Abstract】In recent years, long-duration mega-earthquakes have occurred frequently all over the world, which caused prominent disasters. It is investigated that the vulnerability of electric power facilities during long-duration mega-earthquakes is more serious than that during the conventional ones (Mw = 5.5–7.5). It is of great significance to study the seismic characteristics of the electric power facilities and its prevention and mitigation to earthquakes under long-duration mega-earthquakes. The seismic damage characteristics are summarized based on the collections and inductions of the typical long-duration mega-earthquakes around the world. The damage instances of electric power facilities in recent typical long-duration mega-earthquakes are summarized and compared with those in conventional ones, and the disaster characteristics are further analyzed. The results show that the major causes of serious damage to the electric power facilities are the large shear stress of mega-earthquakes, the serious liquefaction of the site and the change of the spectral characteristics of the ground motion during shaking. Finally, four suggestions are put forward to the seismic design of the electric power facilities based on the characteristics of the long-duration mega-earthquakes, which can provide a reference for the seismic reliability and disaster prevention and mitigation of the electric power facilities.
【Keywords】 long-duration mega-earthquake; electric power facilities; soil liquefaction; disaster characteristics; seismic design;
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