Slender structures, such as telecommunication towers, chimneys and elevated water reservoirs etc. can be very sensitive to dynamic wind loading. Indeed, wind-induced forces can cause significant dynamic response which may lead to structural damages. In the case of telecommunication towers, it can also lead to signal transmission distortion.
Therefore, design criteria for slender structures must include dynamic stiffness which depends on the main resonance frequencies and inherent structural damping. These characteristics must be measured when the structure is first erected and compared with the design data. It is also recommended that they are measured during maintenance activities.
In addition, in harsh/windy environments, the permanent monitoring of structural vibrations is recommended. Indeed, the natural frequencies of a structure can be obtained from acceleration measurements and the shifts of these natural frequencies values can be a good criterion for the evaluation of the structure’s integrity, allowing for preventive action.