Study of viscous damping models for nonlinear dynamic analysis of frame structures
(2023)
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- Abstract
- Nonlinear dynamic analysis of buildings and infrastructure uses viscous damping models to represent energy dissipation sources independent of the materials' constitutive rules. These mechanisms correspond to connections, the interaction between structural and non-structural elements, and the interface between concrete and steel, among others. All these complex sources of energy dissipation have been considered indirectly through viscous damping models since they are expected to have no significant influence on the structure's response. However, it is well known that these models can significantly affect the results when the system enters the inelastic range. This thesis addresses this problem by suggesting modifications for existing models and new approaches. Initially, it is proposed to eliminate the geometric stiffness matrix from the definition of a tangent stiffness proportional viscous damping model. Then, a new condensed damping model proportional to the tangent stiffness matrix is presented to reduce the high energy dissipation caused by the existing condensed models. Finally, new non-linear damping models are formulated that allow limiting the damping forces, ensuring that the assumptions initially used to implement viscous damping models in dynamic analysis are fulfilled.
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Citations
Baena Urrea, J. F. (2023). Study of viscous damping models for nonlinear dynamic analysis of frame structures. https://hdl.handle.net/2078.5/233727