Supplementary to dynamic tests on Cleddau Bridge at Milford Haven held in March 1975 an analysis was made to examine some aspects of the dynamics of the bridge. The model for analysis includes coupling of pier bending with bending of the superstructure box, and allows assessment of the effect of pier coupling both in natural vibration characteristics and in modal damping. Calculations were made of the theoretical response of the bridge under test loading, and a simulation was made of the acceleration response at measuring stations for comparison with recorded accelerometer outputs. The concept of damping the structure by viscous dampers at the supports of the suspended span was considered and damper requirements evaluated for the first two modes. Finally, in damping tests the integration of acceleration curves is considered for reducing distortion from higher mode responses, and the use of magnetic-tape recording is suggested.

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