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Dynamic analysis of a multi-Span bridge subjected to a moving vehicle using moving node technique

Ghafoori, E ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: University of Southampton, Institute of Sound Vibration and Research , 2008
  3. Abstract:
  4. In this paper dynamic analysis of multi-span bridges subjected to a moving vehicle is investigated. Finite element method is used to model the problem, and the Newmark technique is used for direct integration of the governing equations. In this regard, the moving node technique is applied to represent the dynamic responses of the multi-span bridge, and the vehicle is idealized as a sprung-mass system. Results indicate that the maximum vertical deflection of the multi-span bridge occurs at the span under the vehicle. It was found that the mid-span vertical deflection of spans for dynamic and static loading are not the same, and the position of the vehicle for maximum deflection for dynamic and static loading are also different, and the distance between two maxima increases by the velocity of the vehicle. Considering the results obtained from axial dynamic responses of the mid-spans, it is interesting to note that by increasing the velocity and acceleration or deceleration of the moving vehicle the vibration amplitudes of the axial responses increase. It is also worthy of noting that by increasing the velocity or acceleration of the moving vehicle, the vibration frequency of the axial responses decreases during the constant-speed period
  5. Keywords:
  6. Dynamic response ; Offshore pipelines ; Structural dynamics ; Vehicles ; Vibrations (mechanical) ; Governing equations ; Maximum deflection ; Moving mass ; Multi-span beams ; Multi-span bridges ; Vertical deflections ; Vibration amplitude ; Vibration frequency ; Finite element method
  7. Source: 7th European Conference on Structural Dynamics, EURODYN 2008, 7 July 2008 through 9 July 2008 ; 2008 ; 9780854328826 (ISBN)