Abstract
The paper presents the experimental and analytical modal analysis of a steel-girder arch bridge. The field test is carried out by ambient vibration testing under traffic and wind-induced excitations. Both the peak picking method in the frequency domain and the stochastic subspace identification method in the time domain are used for the output-only modal identification. A good agreement in identified frequencies has been found between the two methods. It is further demonstrated that the stochastic subspace identification method provides better mode shapes. The three-dimensional finite element models are constructed and an analytical modal analysis is then performed to generate natural frequencies and mode shapes in the three-orthogonal directions. The finite element models are validated to match the field natural frequencies and mode shapes. It is observed that the finite element Model-2 with the concrete slab provides the greater stiffness in the transverse direction of the bridge. The finite element Model-1 with the lumped masses agrees well with the field tests and can serve as a baseline model of the bridge.
Original language | English |
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Pages (from-to) | 1022-1031 |
Number of pages | 10 |
Journal | Journal of Structural Engineering |
Volume | 130 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2004 |
Keywords
- Arch
- Bridges
- Experimentation
- Modal analysis
- Model tests
- Steel
- Vibration
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering