This thesis examined by means of numerical simulations with finite elements the effectiveness of viscoelastic materials as a means to achieve energy dissipation in steel buildings. The material was applied by using shear treatments and viscoelastic dampers. The formulation proposed by Rao was used to study the shear treatments. This method was applied to investigate the effect of the different parameters that affect the loss factor. In addition, finite element models were developed in the program ABAQUS to verify the results and conclusions and to study more complicated structures. The results showed that the effectiveness of the damping treatment has a strong dependency on the base element geometry. A simple procedure based on the state equations and the complex eigenvalues was introduced to determine the global loss factors obtained with viscoelastic dampers. The results of the method were verified by comparing them with those obtained from three-dimensional finite element models.
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