Abstract
Japan is one of the most earthquake-prone countries in the world. In the great east Japan earthquake, power plants were severely damaged by strong ground motion and tsunami, and power generation at some power plants had been stopped for a long time. These suspensions of power generation impacted public institutions and industry. Therefore, improving the earthquake resistance of power plants is very important at present. In particular, thermal power plants are important power plants assuming the current Japanese power supply. In current thermal power plants, simple anti-vibration devices made of steel are installed between boiler and its support structure. However these devices do not have enough damping against after shocks following a main shock, because devices made of steel are damaged by repeated deformation. Therefore we propose applying dampers to thermal power plants in order to improve their earthquake resistance. In this paper, boiler structure is modeled to two mass points model at first. Next, earthquake response analysis is carried out in order to compare vibration control performance of dampers (steel damper, friction damper, oil damper, viscous damper, viscoelastic damper). As a result, it was confirmed that the friction damper and the viscous damper have good vibration control performance. The friction damper and the viscous damper suppressed relative displacement between a boiler and its support structure. Additionally convergence of the response after the earthquake was quick.
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