Abstract

GIL-PELAEZ, Jhon Jairo  and  SUAREZ, Luis. Global loss factor in steel structures with viscoelastic dampers through state equations. Iteckne [online]. 2016, vol.13, n.2, pp.146-156. ISSN 1692-1798.

In this work, is presented a method based on use complex eigenvalues to determine factors of overall loss and equivalent natural frequencies in a steel frame with viscoelastic dampers in the bracing bars. The complex eigenvalues are obtained to solve the eigenvalue problem associated with the equations of motion written as state equations of first order. A study using three-dimensional finite element models developed in ABAQUS program including variations with frequency of materials was also made. The estimations at the global loss factors was achieved from an analysis of the frames subjected to a harmonic load in regime using the half power method. The study allows to check the effectiveness of the technique on the level of additional damping can be achieved.

Keywords : Viscoelastic dampers; viscoelastic materials; energy dissipation; loss factor.

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