2011 Articles
Equivalent Modal Damping of Short-Span Bridges Subjected to Strong Motion
In this paper four different methods are investigated for estimating the equivalent modal damping ratios of a short-span bridge under strong ground motion by considering the energy dissipation at the boundary. The Painter Street Overcrossing (PSO) is investigated because of seismic data availability. Computed responses using the response-spectrum method with the equivalent damping ratios estimates are compared with the recorded responses. The results show that the four methods provide reasonable estimation of equivalent modal damping ratios and that neglecting off-diagonal elements in the damping matrix is the most efficient and practical method. The equivalent damping ratio of the PSO was nearly 25% under an earthquake with peak ground acceleration of 0.55g, which is much higher than the conventional assumption of 5%.
Subjects
Files
-
a79-_ASCE_BE.1943-5592.pdf application/pdf 741 KB Download File
Also Published In
- Title
- Journal of Bridge Engineering
- DOI
- https://doi.org/10.1061/(ASCE)BE.1943-5592.0000149
More About This Work
- Academic Units
- Civil Engineering and Engineering Mechanics
- Published Here
- March 27, 2013