DYNAMIC RESPONSE OF TWO-SPAN CONTINUOUS BEAM UNDER MOVING LOADS

The dynamic response of a two-span continuous beam traversed by multiple moving loads at a constant velocity is investigated, in which the continuous beam has uniform span length. Each span of the continuous beam is modeled as a Bernoulli-Euler beam and the moving loads are represented as a sequence of wheel loads with identical space. A method of modal analysis is proposed in this paper to investigate the vibration of two-span uniform beam. The effects of different influencing parameters, such as the moving load velocity, the damping ratio of the beam and the moving loads space, on the dynamic response of the continuous beam are examined. The resonance condition of the two-span continuous beam is put forward which depends on the beam natural frequency and the moving loads space.