摘要(英) |
The newest domestic seismic design code in 2005 provides the microzonation of earthquake accelerations, the guidelines for quality control of construction, the principle of seismic assessment and retrofit of buildings and the guidelines for seismic design of base isolation and energy dissipation. Nevertheless, the method of seismic assessment is not specified and just states that the public acknowledged principle of analysis is required in the code. Furthermore, except from using the nonlinear time history analysis, there is not any method of seismic assessment for a heavily damped RC building with added damping device appeared in literature.
The present study is to investigate the application of the capacity spectrum method for the seismic assessment of the heavily damped RC building with added metallic damper. The objectives of the present studies are to set up the procedures of seismic assessment for that type of building and to understand the related factors which will affect the results of assessment. In addition, the guidelines for the evaluation of the seismic capability of a RC building with added metallic dampers are proposed. In this study, using the commercial program SAP2000, a 10-story RC building with and without added metallic dampers, are pushed horizontally. Results are compared with that of the nonlinear time history analysis using three different sets of simulated earthquakes compatible with the designed spectra of Jung-Li area. It is found that, in comparing with the results of nonlinear time history analysis, the displacement responses of the models, using the nonlinear pushover method, are conservative. But the maximum base shear force value of the RC building is under-estimated and should be enlarged with a factor of 1.3. Therefore, it is suggested that the estimated seismic capability of a RC building with added metallic dampers in Jung-Li area, using the nonlinear pushover method, should be reduced with a factor of 0.8. |
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