| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 93 === The semiconductor and TFT LCD industries are two of the most important industries in Taiwan. The seismic vulnerability of the factories observed during the 1999 Taiwan Chi-Chi earthquake and the 2000 Taiwan 331 earthquake has raised the attention to the seismic retrofit of these factories. Based on the past experiences, the industries have been bothered by the loss of work-in-process and the business interruption due to small earthquakes. This is because a great amount of vibration-sensitive equipment may shut down automatically during small earthquake excitations. Furthermore, it is believed that major loss may result when the peak ground acceleration at the site exceeds 0.2g.
Based on the aforementioned need, it is proposed in this study to use viscous dampers to seismically retrofit the semiconductor factories. However, due to the difficulties of the construction in the clean room, it is proposed that the dampers to be installed in between the shell structure and the exterior structure of the factory such that the operation of the factory may be least interfered by the construction considering the micro-vibration and cleanness issues of the clean room. Corresponding to this retrofit method, the structure with the viscous dampers is modeled using non-classical damping theory to derive the design formulas of viscous dampers, while the classical damping theory is considered to be inappropriate in this application. The proposed design formulas are validated by a few numerical simulations.
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