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DYNAMIC BEHAVIOUR OF MULTI-SPAN BEAMS UNDER MOVING LOADS

✍ Scribed by K. Henchi; M. Fafard; G. Dhatt; M. Talbot

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 497 KB
Volume: 199
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.1996.0628

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✦ Synopsis

In this paper, an exact dynamic stiffness element under the frame work of finite element approximation is presented to study the dynamic response of multi-span structures under a convoy of moving loads. A dynamic model coupled with a FFT algorithm is developed. The model is highly efficient for calculating the response of bridges under multiaxle moving forces. All the vibration frequencies and mode shapes of the beam-structure may be calculated exactly using the Wittrick and Williams algorithm. Examples show that with only one element per span, exact frequencies and modes could be obtained. Some results on the dynamic amplification factor are presented also as a function of the speed of the moving loads.

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