Abstract：Based on random vibration theories, curves of dynamic response of short and medium-span girder bridges under vehicle-bridge coupling vibrations were studied, with considering bridge surface roughness. The dynamic equations of vehicle-bridge coupling systems were solved using the Pseudo-Excitation Method (PEM), and statistical values and standard deviations of deflection and stress of bridge are calculated conveniently. Based on the method, the statistical solutions can be transformed into deterministic values range, which were paid more attention by engineering community. The results show that standard deviation of deflection and stress in the mid span of bridge is greatly affected by vehicle velocity and randomly uneven bridge surface grade, and the dynamic influence lines of bridge are value range and significantly random characteristics. Compared with the quasi-static influence line, the curve of dynamic response reflects the interaction of vehicle-bridge more evidently.
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