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. In addition, power generation at some power plants had been stopped for a long time. The loss of the power generation impacted public institutions and industry. Therefore, improvement of the earthquake resistance of power plants is important. In particular, thermal power plants are important power plants supplying the Japanese electric power. In the thermal power plants, stoppers made of steel are installed between boiler and its support structure. However, these devices do not have enough damping against aftershocks following a main shock, because devices are damaged by repeated plastic deformation. Therefore, we propose installation the vibration control dampers between the boiler and its support structure in order to improve their earthquake resistance. In this paper, Examination of the parameter of the damper for each installation is conducted in order to suppress the response. In addition, the effect of the damper is verified by confirming the response behavior and comparing the conventional equipment. In the trend of the response, the relative displacement between the boiler and its support structure is suppressed by increased the parameter of the damper. In addition, the response acceleration of the boiler is increased by increased the parameter of the damper. In comparison of the damper, rectangle hysteresis damper has good vibration control performance. The rectangle hysteresis damper suppresses the cumulative relative displacement between the boiler and its support structure. Therefore, in case of installed the rectangle hysteresis damper, fatigue damage of the piping system installed between the boiler and its support structure are possibility prevented.
