Abstract This paper presents a simplified dynamic analysis of a suspension bridge subjected to a ground motion representing a seismic event. A Finite Element (FE) model developed here is found on the conditions that meet the design requirements for initial equilibrium state of a suspension bridge. Geometry and materials are assumed to be linear and elastic, respectively. Therefore, time consuming nonlinear iterations are not necessary to obtain key structural responses. First, a fundamental vibration behavior of a suspension cable was verified with an exact solution, and a stiffening girder-pylon structure modeled with three dimensional frame elements was validated with both free and forced vibration analyses. To simulate a seismic motion, a horizontal ground force was applied in longitudinal and transverse directions of a cable-stiffening girder-pylon system and the response spectrum analysis was conducted with two mode combination methods: Square Root of Sum of Square (SRSS) and Complete Quadratic Combination (CQC). Finally, a FE model of in-situ Nam-hae grand bridge was developed and its dynamic responses after complete erection were simulated under virtual ground motions, and diagrams of member forces were visualized by a DACS-POST, a web-based post-processing program.
Simplified finite element dynamic analysis of cable-supported structures subjected to seismic motions
KSCE Journal of Civil Engineering ; 14 , 4 ; 579-587
2010-06-03
9 pages
Article (Journal)
Electronic Resource
English
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