A Study of Seismic Performance of Structure with Improved Vertical Damper
| Autor: | Jeng-yu Chen, 陳政宇 |
|---|---|
| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 A new improved design approach for vertical damper was investigated for it’s seismic performance. The vertical damper utilized the vertical displacement of the girder to dissipate energy, therefore it avoid the bracing needed by the commonly used metallic damper and could be installed in the structure with much less restriction. Three frames of five, ten, and twenty storey with/without vertical dampers were studied with pus-over and seismic excitation to verify the effect of the damper with different design approach. The results were also compared to the previous study results. First, new design approach with single type of damper for all floors to reduce the cost of design, manufacture and construction was adopted. The designed damper sued at the top, medium and bottom floors of the previous study was used in this research. Also different parameters such as stiffness and yielding stress of the damper were investigated. SAP2000 was used for pushover and nonlinear dynamic analysis. The equivalent and effective damping ratios of the system are compared. The attenuation of the ductility ratio and maximum displacement were compared to investigate the effectiveness of the damper design. Finally the pushover and nonlinear dynamic analysis results were compared for failure mechanism and energy dissipation.. The research results are as follows: 1. The Improved Vertical Damper was easier to design in additional to the cost benefit of manufacture and construction. 2. The Improved Vertical Damper demonstrates similar caparcity on reducing seismic response of structure as the previous study. 3. The Improved Vertical Damper design according to the bottom storey had the most consistence results for seismic performance of stucture. 4. The vertical damper system did not alter the failure mechanism of the original structure; the plastic hinge pattern was identical x-drift ratios make it favorable for seismic mitigation of structures. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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