THE NON-LINEAR DYNAMIC ANALYSIS OF RC TELECOMMUNICATION TOWERS CONSIDERING THE EFFECTIVE STIFFNESS

The goal of this chapter is to propose a non-linear dynamic model based on experimental data and NBR-6123-87 to accomplish a non-linear dynamic analysis of slender structures subjected to wind loading. At first we compute the static response given by the mean wind speed. In this part of the problem we consider the concept of effective stiffness to represent the physical non-linearity of material and a P-Delta method to represent the geometrical non-linearity. Considering the final stiffness obtained in that P-Delta method we compute the dynamic response given by the floating wind speed, according to the discrete dynamic model given by NBR-6123-87. A 40 m RC telecommunication tower was analyzed and the results obtained were compared with those given by linear static and dynamic models.