The influence of damping on progressive collapse analysis
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Date
2023-10
Publication Type
Conference Paper
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yes
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Abstract
The most common method of modeling damping in structures is with equivalent viscous damping with the Rayleigh damping model. However, it is well-known that the Rayleigh damping model may cause spurious damping forces and nonphysical behavior for inelastic structures. Remedies have been proposed to overcome these problems, such as various incremental versions using the tangent stiffness or the use of modal damping instead. These may be appropriate for inelastic structures with negligible changes of the vibration modes, and without softening behavior for the Rayleigh damping models. In progressive collapse analyses, these damping models may be inappropriate because of the radical change in vibration modes, as well as the changes to the mass and stiffness matrix. In this paper, initial and incremental versions of the Rayleigh and modal damping models are presented and compared for a structure undergoing progressive collapse. The damping model is not critical if the objective is to assess the response until the first failure. However, the choice of the damping model may lead to large dissimilarities after the first failure in a progressive collapse analysis.
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published
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Book title
COMPDYN 2023: 9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Proceedings Volume II
Journal / series
Volume
Pages / Article No.
3157 - 3172
Publisher
Institute of Structural Analysis and Antiseismic Research School of Civil Engineering, National Technical University of Athens (NTUA)
Event
9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2023)
Edition / version
Methods
Software
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Date collected
Date created
Subject
Equivalent Viscous Damping; Rayleigh damping; Modal Damping; Structural dynamics; Progressive collapse; Nonlinear Response History Analysis
Organisational unit
08809 - Frangi, Andrea (Tit.-Prof.)