Abstract
A discussion of an article with the aforementioned title, published in this journal (Vol. 9, No. 6, November/December 2004), is presented. The discusser comments on the complexity of vibration behavior of bridges due to moving vehicles, and seeks further information on the vehicle model and assumptions used in the original study. In the original study, the moving vehicle is treated as a pair of constant concentrated loads, and the effect of road surface roughness and the interaction between vehicle and bridge is not addressed. For straight box girder bridges, the authors suggest an impact factor of 0.6 for support reaction. The discusser questions the origin of such a high impact factor when the bridge deck is assumed to be smooth and the vehicle is simulated as a pair of constant concentrated forces.
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