Research And Application Of Viscous Dampers For Seismic Reinforcement And Reconstruction Of Structures

In order to achieve the goal of seismic reinforcement, energy dissipaters (with dampings) or energy dissipating components are usually added to some places of structures that needed being reinforced. For the viscous dampers, there are many advantages, such as clear reinforcement mechanism, good strengthening effect, safety and reliability, simple construction and quite short construction period. Because the disturbances of viscous dampers to original structures are quite slight, its application has wide prospects in the region of seismic reinforcement of structures.In this thesis, some common viscous dampers and their mechanics models are firstly introduced, and design and calculation procedures for structure with energy dissipation devices are also discussed in detail.Then, through the discussion of the relations between velocity exponent of dampers and its other parameters, it's found that the energy consuming effects of dampers could be improved by decreacing its velocity exponent. And also, the arrangement principles of dampers in structures are concluded by comparing seismic performances with different installation modes of dampers.Later, dynamic analysises for one example of a 12-story frame structure are performed before and after its reinforcement. Through the nonlinear time-history analysis, it's concluded that, after the reinforcement with viscous dampers, displacements of the structure, together with its interstroy drifts, accelerations, internal forces and modal damping rate have been reduced in different extents. Based on the analysis above, it is verified that the reinforcement method with viscous dampers for structures has great superiority on enhancing its seismic performance.