Forced vibration tests were conducted on a six span reinforced concrete highway bridge located in Plympton, near Plymouth, South West England. Excitation of the bridge was by a purpose built hydraulic vibrator with a maximum force amplitude of ±5KN. The bridge response was measured using accelerometers and frequency response functions computed from the accelerometer outputs and the input force. Natural frequencies, mode shapes and damping values were extracted from the measured response functions. This paper describes the testing procedure, equipment used and data processing techniques adopted to estimate the dynamic properties. The results from the tests are presented and discussed.
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