Some full-scale measurements of wind-induced response of the CN Tower, Toronto☆
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Abstract This paper presents some measurements of the dynamic response of the CN Tower in Toronto, during a partial erection stage. Measurements were made of the strain in an instrumented reinforcing bar at the base of the tower with the concrete shaft completed (the concrete shaft extends to about 1480 ft. above the ground). The average gradient wind speed during the strain measurements was about 45 m.p.h. Autocorrelation functions and power spectra computed from the strain record indicated that the wind induced dynamic response of the concrete shaft was almost entirely in the fundamental mode of vibration. The measured frequency of the fundamental mode was found to agree well with that predicted from a dynamic analysis of the tower at this phase of erection. Measured estimates of the structural damping of the tower shaft in the fundamental mode of vibration were found to be consistent with those used in an aeroelastic model study carried out for the CN Tower at the Boundary Layer Wind Tunnel Laboratory of the University of Western Ontario.