IMPACT FORMULAS FOR VEHICLES MOVING OVER SIMPLE AND CONTINUOUS BEAMS

In this paper, a new set of impact formulas are developed for simple a nd continuous beams subjected to moving vehicle loads. By modeling a v ehicle as sprung masses and a bridge structure by beam elements, a par ametric study is performed for various simple and continuous beams tra versed by five-axle trucks. Central to this study is the adoption of a nondimensional speed parameter s, which is defined as the ratio of th e driving frequency of the vehicle, as represented by pi upsilon/L, wi th upsilon denoting the velocity of the vehicle and L the characterist ic length of the beam, to the fundamental frequency omega of the beam. From the numerical study, it is concluded that the impact factors for the deflections, bending moments, and shear forces at the midpoints o f simple beams are linearly proportional to the speed parameter, and t hat these formulas can be multiplied by certain modification factors t o yield results for continuous beams and support shears. Other paramet ers studied herein include the vehicle/bridge frequency ratio, damping of the bridge, and road surface roughness.