The Research On Aseismic Behavior And The Optimal Analysis Of Viscoelastic Dampers

With the recognition of the importance of the aseismic engineering and the development of the research, vibration control has become an effective solution helping people to reduce the response of buildings in earthquake. One of these methods, passive control using viscoelastic dampers, has been applied to more and more projects in the past, because they can reduce the seismic response effectively, economically and the structures are rarely need to be repaired after the viscoelastic dampers are installed. A mathematical formula has been established for the system, consisting of brace and viscoelastic damper. After analysis of the parameters of the devices, some conclusions are achieved that we can directly use the parameters of the dampers instead of devices to design the buildings in the common situation. Then a single-freedom degree is used to analysis the performance of the building with viscoelastic dampers under earthquake. The method of parameter optimum of viscoelastic damper is investigated. Two frame buildings, with viscoelastic dampers and no dampers respectively, are analyzed using finite element method and step-by-step method. This result testifies the efficiency of the viscoelastic dampers. Two shear wall structure incorporating dampers within the shear wall are studied.Three different stiffnesses of shear walls are investigated. The results show the effects of the width of the shear wall and the size of the cut-out on the seismic response. An innovative optimum design system, using step-by-step method analysis for structures with viscoelastic dampers(VED) is proposed. The interstory drift is used as the controllability index and compared with other controllability index.