Optimal Design of Energy-Dissipated Substructure with Viscous Damper for High-Rise Building

In order to ensure that the damper can function normally under various levels earthquakes, and the energy-dissipated substructure will not be damaged under the additional force of the damper, it is necessary to make special design of the energy-dissipated substructure. At present, there is no mature design method of energy-dissipated substructure in the industry, which often leads to conservative design. Therefore, effective optimization design method is needed to ensure the normal function of damper under various levels earthquake with reasonable engineering cost. This paper proposes a performance-based design method of energy-dissipated substructure, which mainly involves the following four aspects: firstly, the performance-based seismic design method studies the reasonable performance objectives of energy-dissipated substructure members; Secondly, the internal force of elastic design under frequent earthquakes multiplied by the amplification factor is used to approximate the rare earthquake action, which avoids the cumbersome operation and low efficiency elastoplastic analysis; Thirdly, some other optimization methods of energy-dissipated substructure are studied, such as using higher strength material to reduce the section and stiffness of substructure members, so as to avoid torsion and stress concentration in the substructure; Fourth, a new idea of damper design is proposed. By using the damper with valve, only the elastic analysis under frequent earthquakes is needed. When the pressure generated by the valve exceeds the maximum locking force under rare earthquakes, the special relief valve opens to protect the damper from damage during rare earthquakes. Finally, the effectiveness of this method is verified by a simplified structure model. The results show that this method can effectively simplify the design process of energy-dissipated substructure, improve the analysis efficiency, and has practical engineering value.