Analysis And Design On Energy Dissipation Reduction Structure With Toggle Brace Displacement Amplification Mechanism Viscous Dampers

The inherent characteristics of reinforced concrete frame structure,concrete frame-shear wall structure or reinforced concrete frame-tube structure make its lateral displacement of the structure relatively small under earthquake,and the optional placement of dampers is restricted by certain conditions such as seismic strengthening,which make viscous dampers installed in the structure are not able to exert its energy dissipation characteristics due to the small deformation of the floor.Therefore,considering the existing arrangements with displacement amplification viscous dampers,this paper studies a new toggle brace damper system which can amplify the displacement of the input damper and enhance the damping performance of the structure.The main contents are as follows:(1)Based on careful review of domestic and foreign literature materials,this paper sums up the damper’s type,construction,principle of shock absorption,factors influencing the energy dissipation of the damper and the mechanical model.Furthermore,the design principles,design points and additional damping ratio expressions of the energy dissipation structure are given in accordance with the specifications.(2)This paper explains the new toggle brace damper system’s displacement amplification coefficient,damping force calculation formula,damping parameters and the influence of the damping parameters on the performance of the damper.The calculation and analysis methods commonly used in China were summarized and the specific design process of the energy dissipation structure is given.(3)This paper uses SAP2000 for numerical simulation analysis,and considers the impact of installation of different displacement amplification viscous dampers on the seismic performance of the structure.The ground motions in this paper accord with the requirements of “three-level”.The interlayer displacement angle,the maximu m floor displacement,the maximum floor acceleration,the floor shear force and the hysteresis curve of the damper of the seismic performance indexes are extracted,compared and analyzed.Furthermore,the influence of different damper parameters on the damping effect of the structure are compared.(4)The calculation formulas of the displacement amplification factor and damping force of the new toggle brace damper system are derived.By optimizing the arrangement and combining with the calculation results of the second example,this paper verifies that the installation of the new toggle combination brace damper system is better than the installation of the new toggle brace upper damper system when the amount of dampers are in the same.Not only that,this paper studies the influence of the change of damper parameters on the performance of the new toggle brace damper system under different levels of ground motion,which provides sufficient basis for the reasonable design and parameter optimization under different levels of seismic action.The new type of toggle combined brace damper system was discussed in this paper.By optimizing the layout of the new type of toggle combined brace damper system,the expected damping effect was obtained,which will provide strong support for the further research and application of the toggle brace damper system.