Enhancing the anti-seismic ability of building structures, especially for high-rise structures has been a challenging task, which draws general concern in engineering. One of the most efficient methods is structural vibration control. The passive control, damping devices are widely applied in vibration control of high-rise structure. In general, most of them are designed in two dimensional structures, rarely considering the case of three dimensional structures. Since the two dimensional control systems neglect several important response characteristics, it may lead some significant errors in the results. In order to achieve better control effect, we venture to propose a new optimal damper design of third-generation three-dimensional 20-storey Benchmark model under the multi-directional earthquake in this paper. By means of Rayleigh damping and D-value, dynamic equations including the damping matrixes, stiffness matrixes of the structure are obtained. Then in the course of the optimization, the displacement reducing coefficient (DRF) is used as the objective function to optimize the placement of damping devices and control parameters based on Genetic Algorithm (GA). Numerical results in this paper show that the optimal design method proposed in this paper is effective and flexible. It can obviously reduce the seismic responses of building structure.
