Journal
JOURNAL OF EARTHQUAKE ENGINEERING
Volume 12, Issue -, Pages 125-145Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13632460801925822
Keywords
viscous damping modeling; shake table tests; theory/experiment comparison; time history analysis
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Inelastic time history analyzes (ITHA) are recognized as the most suitable tool for describing the behavior of structures under seismic actions. It is clear that the reliability of ITHA results is strongly dependent on the modeling choices. One of the aspects still debated, in spite of a large amount of research, is the modeling of viscous damping forces. In the case of a single degree of freedom (SDOF) structure, the damping not represented by hysteretic response is commonly assumed proportional to the square root of the system stiffness: typically in the research papers it is not declared whether the initial or tangent-stiffness is considered. Recent research has shown that initial or tangent-stiffness proportional damping can give very different results in terms of energy dissipation, and peak response displacement. In this work, experimental and numerical tests performed to defect the most appropriate model are described and discussed.
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