Paper Title:
The Natural Bending Vibration of the Continuous Beam and the Impact Factor of Bridge
  Abstract

The natural frequencies and mode shapes of 2, 3 and 4 spans continuous beam with universal cross section are calculated, and these dynamic parameters of 2 spans continuous beam model are measured. From the analysis and the model test, the locations of the maximum curvatures of the mode shapes are determined, and comparing that with the maximum bending moment of the beam under the action of uniformly distributed load, the selection of the natural frequency of the beam is discussed with the General Code for Design of Highway Bridges and Culverts as the impact factors of the beam is calculated. It is shown from the results of the analysis and the test that, for the impact factor, when the effect of positive bending moment caused by impact force is calculated, the fundamental frequency must be used as shown in the General Code, and the 2nd or 3rd frequency must be used when the effect of negative bending moment caused by impact force is calculated. The selection of the frequency should be combined with the mode shape into account for the specific circumstances.

  Info
Periodical
Edited by
Xuejun Zhou
Pages
1245-1249
DOI
10.4028/www.scientific.net/AMM.90-93.1245
Citation
X. R. Yuan, "The Natural Bending Vibration of the Continuous Beam and the Impact Factor of Bridge", Applied Mechanics and Materials, Vols. 90-93, pp. 1245-1249, 2011
Online since
September 2011
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Price
$32.00
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