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.
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Experimental and Analytical Modal Analysis of Steel Arch Bridge
Journal of Engineering MechanicsJuly 2004
Journal of Engineering MechanicsMay 2010
Journal of Engineering MechanicsAugust 2008
Professor, Dept. of Civil Engineering, Fuzhou Univ., Fuzhou, Fujian Province, People’s Republic of China; and, Professor, Dept. of Civil Engineering, Central South Univ., Changsha, Hunan Province, People’s Republic of China.
Professor, Dept. of Civil Engineering, Tianjin Univ., Tianjin, People’s Republic of China; presently, Visiting Professor, Kentucky Transportation Center and Dept. of Civil Engineering, Univ. of Kentucky, Lexington, KY 40506-0281.
Professor, Dept. of Civil Engineering, Univ. of Kentucky, Lexington, KY 40506-0281.
Received: February 14, 2002
Accepted: October 09, 2003
Published online: June 15, 2004
Copyright © 2004 American Society of Civil Engineers