Seismic Analysis and Design of Structure with Added Viscoelastic Dampers
碩士 === 國立臺灣大學 === 土木工程學研究所 === 83 === A summary on the experimental and analytical study of VE dampers as energy dissipation devices in seismic structural applications is first described. Experimental studies have been carried out on a 2/5 scale five story steel fram...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
1995
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| Online Access: | http://ndltd.ncl.edu.tw/handle/11402976118769167028 |
| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 83 === A summary on the experimental and analytical study of VE
dampers as energy dissipation devices in seismic structural
applications is first described. Experimental studies have been
carried out on a 2/5 scale five story steel frame, a full scale
five story steel frame, and a 1/3 scale three story RC frame.
It can be concluded that VE dampers are effective in reducing
seismic vibrations of structures. The effectiveness of VE dampers does depend on the environmental temperature and therefore should be included as a important design parameter in structural design applications. Analytical studies show that the modal strain energy method can be used to reliably predict the equivalent structural damping of the structure and that the seismic response of the viscoelastically damped structure can be accurately simulated by conventional modal analysis techniques. Therefore the viscoelastically damped frame can be designed with currently available design tools with only minor modifications.
Results from this study suggest that it is possible to
retain an elastic structure under strong earthquake ground
motions if VE dampers are used to provide the structure with
damping ratio larger than 12% under a given design temperature.
Based on this study and the results from previous investigations, a design damping ratio of 15% is recommended for current design earthquakes such as those specified in UBC (1994). It is also preferable to limit the maximum strain of the VE dampers so that damping ratio of the viscoelastically damped structure will not decrease significantly after experiencing the maximum displacements during the earthquake. The design and analysis procedures reported earlier for elastic design of structures with added VE dampers can be readily applied for practical applications.
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