Development of vibration control for boiler structure of coal-fired power plant with earthquake having long period component and long duration

Abstract

The 2011 off the Pacific coast of Tohoku Earthquake had the largest energy in recorded history of Japan and it caused severe damage. The damage occurred in a large area as well as the Tohoku in various ways. Electric power was one of them. Therefore, rolling blackouts were carried out with lack of power supply in a part of the East Japan. The electric power is indispensable because restoration activity advances at a disaster area. Moreover, Japan is the highly advanced information society. The steady supply in case of the emergency is expected while a large earthquake whose seismic center is Nankai trough is predicted. Therefore, it is necessary to improve seismic proof construction of power plants. At present, the most common type of power generation in Japan is thermal. Even among them, coal-fired power plants become base load power. A proposal of authors is application of vibration control using damper to boiler structures. This study shows the effects while the earthquake with long period component and long duration was used. It is concerned that the damage of the high-rise structure like boiler structure becomes critical by the long period component. Moreover, the durability of the structures and devices is required higher than conventional by the long duration. In this study, authors developed a damper to use for vibration control of the boiler structure and showed the analytical and experimental results of applicability for the earthquake with long period component and long duration of it.

Effects of Strong Ground Motion with Identical Response Spectra and Different Duration on Pile Support Mechanism and Seismic Resistance of Spherical Gas Holders on Soft Ground

“…Therefore, there is also a need to determine the effects of long-duration earthquakes on holders. In fact, studies on long-duration earthquakes have already begun in some industrial facilities [18]. For example, there were severe damages to oil storage tanks due to liquid sloshing during the 2003 Tokachi-oki earthquake, which was caused by long-period and long-duration seismic waves [19].…”