DEER ISLE - SEDGWICK SUSPENSION BRIDGE. WIND AND MOTION ANALYSIS

This report presents the analysis of wind and motion data for the Deer Isle - Sedgwick, Maine, suspension bridge. The data were collected over a period of approximately three years. Objectives included processing to show wind turbulence characteristics, bridge vibratory characteristics, and possible relations between wind and deck motions. The data reduction process is described. Wind data are formulated as spectra and coherence functions for directions relative to the bridge. Acceleration spectra for the same winds are presented, and it is observed that acceleration responses are sensitive to wind direction as well as wind velocity. The bridge fundamental mode shapes and frequencies are derived.