Optimization analysis on parameters of multi-dimensional earthquake isolation and mitigation device based on genetic algorithm

Parameter optimization analysis on the multi-dimensional earthquake isolation and mitigation device (MEIMD) installed in reticulated structures is carried out in this study. First, optimization parameters and constrain conditions are determined in accordance with the characteristics of MEIMD, and an object function is derived from the energy equation. Then, the genetic algorithm is used to realize parameter optimization of the MEIMD added in a cylindrical reticulated shell. Finally, in order to verify the effectiveness of the proposed optimization method, dynamic responses of structures without devices, with devices possessing random and optimal parameters are compared, and the sensitivity to the earthquake excitations of the optimization method is studied. It can be concluded that dynamic responses of the structure decrease obviously when adding the MEIMD, and a better seismic reduction effect can be reached when the MEIMD is designed optimally in accordance with the optimization method, and different earthquake excitations have slight influence on the optimization results.