A simplified method of analyzing the transverse vibration of railway bridges

Transverse vibrations of bridges stirred by train affect the bridge´s safety and comfort of the train. For simply supported beam, the paper deduces the response of the beam under a fixed harmonic load, uniform constant load or uniform moving harmonic load. The conclusion is that the response of the beam under uniform moving harmonic load is only about half of the response under a fixed harmonic load, which makes it reasonable that the train translates into a fixed harmonic load. Then a simplified analysis method of the bridge´s vibration is obtained. The Example shows the feasibility of this simplified analysis.