The problem of vertical non-linear vibrations of a single-span suspension bridge due to a random stream of moving vehicles is considered. The inertia forces of car bodies and vehicle suspensions are taken into account because each vehicle is idealized by a set of viscoelastic oscillators. Vehicle arrivals at the bridge as well as the vehicle types and the masses of the truckloads are assumed to be random variables. The bridge model is defined as flat and geometrically non-linear. The numerical simulation method is developed to determine expected values and standard deviations of the bridge response. Solutions for the bridge deflections, the tension of cables and bending moments at the girder are presented and compared with results which have been calculated in simplified cases when a train of concentrated forces moving in the dynamic or static conditions idealizes vehicular traffic loads. (C) 1998 Academic Press. [References: 15]
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