Noise generated from bridge expansion joints during vehicle passing has caused localized environmental problems around the world.The single-gap expansion joints of bridges installed on a freeway ramp bridge in a city were selected for this paper.The vibration and noise of vehicles passing through the bridge expansion joints were measured.The test and analysis results show that:①the vibration of single-gap expansion joints is high-frequency vibration,and the characteristic frequency is concentrated in 2200～3000Hz;②the vibration of the concrete in the anchorage area belongs to low-frequency vibration,and the characteristic frequency is lower than 100Hz;③the char-acteristic frequency of the noise caused by vehicles passing through the single-gap expansion joints is concentrated in 30～1000Hz.
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