Passive Control Of Highway Structures: Use of Damped Resonant Appendages to Augment Damping in Cable-Stayed Bridges - A Feasibility Study
Abstract/Contents
- Abstract
- A study is carried out to investigate how effective tuned appendages with a relatively small mass and a high damping ratio can be to increase the inherent damping in cable-stayed bridges and reduce, thus, their response to earthquake excitations. The study involves the review of a theoretical formulation that explains why the addition of these appendages may improve the damping characteristics of a structure, and numerical and experimental tests conducted to assess the validity of this theoretical formulation and the extent to which they can reduce the seismic response of cable-stayed bridges. In the numerical study, an actual cable-stayed bridge is modeled with finite elements and analyzed with and without the proposed appendages under different earthquake ground motions. Appendages with damping ratios of 10, 15, 20, and 30 per cent and weights that respectively represent 0.67, 1.5, 2.7, and 6.0 per cent of the total weight of the bridge are considered. In the experimental test, a 12-foot long cable-stayed bridge and an appendage consisting of a small mass, a small spring, and a small viscous damper are built and tested, without and with the appendage, on a pair of shaking tables set to reproduce specified ground acceleration records from past earthquakes. The damping ratio of the appendage in this test is 32 per cent and its weight represents 8 per cent of the weight of the bridge model. In the numerical test, it is found that the appendages reduce the longitudinal response of the bridge deck of the analyzed bridge up to about 86 per cent. Similarly, in the experimental test the appendage reduces the longitudinal bridge deck response about 41 per cent. It is concluded, thus, that the suggested appendages may indeed be effective in reducing the response of cable-stayed bridges to seismic disturbances, and that they have the potential to become a competitive alternative for their seismic design.
Description
| Type of resource | text |
|---|---|
| Date created | 1992 |
Creators/Contributors
| Author | Takeda, Tetsuo |
|---|---|
| Author | Tokuyarna, Seiji |
| Author | lizuka, Masaorni |
| Author | Ichinorniya, Toshirnichi |
| Author | Arita, Tomohiko |
| Author | Kanda, Katsuhisa |
| Author | Yamada, Kazuhiko |
| Author | Ukon, Hachiro |
| Author | Okirni, Yoshihide |
| Author | Okamoto, Hiroaki |
| Author | Abdej-Ghaffar, Ahmed M |
| Author | Masrj, Samj F |
| Author | Ali, Hosam-Eddin |
| Author | Villaverde, Roberto |
| Author | Martin, Scott C |
Subjects
| Subject | Tuned Appendages |
|---|---|
| Subject | Viscous Damper |
| Subject | Longitudinal Response |
| Subject | Bridges |
| Genre | Technical report |
Bibliographic information
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Preferred citation
- Preferred Citation
Takeda, Tetsuo and Tokuyarna, Seiji and lizuka, Masaorni and Ichinorniya, Toshirnichi and Arita, Tomohiko and Kanda, Katsuhisa and Yamada, Kazuhiko and Ukon, Hachiro and Okirni, Yoshihide and Okamoto, Hiroaki and Abdej-Ghaffar, Ahmed M and Masrj, Samj F and Ali, Hosam-Eddin and Villaverde, Roberto and Martin, Scott C. (1992). Passive Control Of Highway Structures: Use of Damped Resonant Appendages to Augment Damping in
Cable-Stayed Bridges - A Feasibility Study. CUREE_Kajima Research Project Report CKI-15. Stanford Digital Repository. Available at: http://purl.stanford.edu/rc270zq3733
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- jabeec-email@stanford.edu
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