Abstract
Control algorithm based on semi-active dynamic absorber for aseismic design is investigated. The structure with joint elements is simplified by dual mass model and they are regarded as main and sub structure. Considering the sub structure and a joint element as a semi-active dynamic damper, control algorithm to reduce the seismic response of main structure is studied. This algorithm demands a damper to act as a spring which has various spring constants and the stiffness is shifted real time based on the information for the dominant frequency of input earthquakes, so as to avoid the resonance between the boiler structure and the ever-changing dominant frequencies of input earthquakes. Numerical simulation showed that the proposed method is superior to the optimally tuned passive dynamic absorber.
