Global loss factor in steel structures with viscoelastic dampers through state equations
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Universidad Santo Tomás. Seccional Bucaramanga
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En este trabajo se presenta un método basado en el uso de valores propios complejos para determinar los factores de pérdida globales y las frecuencias naturales equivalentes en un pórtico de acero con amortiguadores viscoelásticos en las barras de arriostramiento. Los valores propios complejos se obtienen de resolver el problema de valor propio asociado con las ecuaciones de movimiento escritas como ecuaciones de estado de primer orden. Un estudio utilizando modelos tridimensionales de elementos finitos desarrollados en el programa ABAQUS incluyendo variaciones con la frecuencia de los materiales también se hizo. Las estimaciones de los factores de pérdidas globales se lograron a partir de un análisis de los pórticos sometidos a una carga armónica en régimen mediante el método de la potencia media. El estudio permite comprobar la eficacia de la técnica sobre el nivel de amortiguación adicional que puede ser logrado.
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.
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.
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Amortiguadores viscoelásticos, materiales viscoelásticos, disipación de energía, factor de pérdida, Viscoelastic dampers, viscoelastic materials, energy dissipation, loss factor