Prestressing forces can be introduced on arched steel structures in such a way that a state of tensile stresses is added which to the existing state counteract the state introduced by the wind negative pressures. Within this scope, the present research aims to present the results obtained with the numerical modeling through the Finite Element Method (FEM) on the structural behavior of steel trusses used in the design of prestressed roof structures. For this purpose, the numerical modeling is performed based on non-linear formulations using the ANSYS software in order to evaluate the structural behavior of arched steel trusses modelled up to failure. Considering the complexity of the behavior of the trusses studied, some structural analysis were carried out including the effects of physical nonlinearities. Based on the results obtained through an extensive parametric analysis, with respect to comparisons between the resistance values of the investigated prestressed trusses, conclusions and design recommendations are established. It should be noted that the material savings achieved by the use of prestressing is the resultant from the increase of tensile state of stresses in the bars of the structure, thus reducing the compression stresses, which are less efficient. In this sense, the structural solutions with prestressed trusses have several advantages that compensate for the additional cost of prestressing.