Theoretical And Experimental Research On The Structure With New Type Of Metallic Dampers

The technique of passive energy dissipation has been rapidly growing and it is now widely used in many parts of the world. This technique reduces the structural response subjected to wind and earthquake through mounting dissipative devices into the buildings. Passive energy dissipation structure designing as an independent section is written in the China Seismic Code. It predict the period of structure with passive energy dissipation devices is coming. Based on the status of this technique, the research work is done in below parts:(1) A new idea of designing mild metallic damper is presented and realized through the new types of dampers that are of some bearing forces in their planes and suitable energy-dissipated capability throughout making metallic dampers different shapes. Quasi-static tests with five types of mild metallic dampers are carried out. Their hysteric loops between damping force and displacement are measured. The energy-absorbed capability of the dampers are analyzed in details in accordance with the experimental results, and two new types of mild metallic dampers are proposed. Numerical simulation results show that this kind of damper is quite effective.(2) A steel structure with new metallic damper is tested on shaking table to study the dynamic characteristic and seismic response, especially the effect of this kind of damper on seismic behaviors of the structure. A frame structure model is made with ADPL language in ANSYS program. Seismic responses of the structure with and without metallic damper are discussed and compared. The result of test and calculated method show that the metallic dampers with "dual functions" presented here not only provide certain stiffness in normal using, but also are of good ability of the seismic energy dissipation.(3) A new mathematic model of parameters optimization for displacement-based energy dissipative devices subjected to earthquake is established. The model is characterized with the minimized sum of dissipative devices stiffness complied with the maximal story-drift angle in several given earthquake recorders closed to codes of angle limitation. The problem, dissipative devices parameters is difficult to select because of different results in varied earthquake recorders is solved throughout new model. An example is also illustrated to verify the model.(4) Direct displacement-based design for buildings with passive energy dissipation devices is presented. Iterative process is shorted through the idea that focus the design...