Influence of damping and force hypotheses for evaluating ductility demand of structures subjected to time history wind loading
Sabbek, Taleb; Langlois, Sébastien; Légeron, Frédéric
SubjectTime domain analysis
Abstract: Current wind design procedures require that structural behavior remains elastic under wind loading corresponding to a specific return period unlike seismic codes that set some specifications to account for the ductile behavior of structures. Based on both linear and nonline-ar dynamic time history analyses of simplified shear frame structures, this study examines the sensitivity of the ductility demand to different analysis hypotheses, and gives recommendations for their adequate values to be used in extended parametric studies. In particular, the current re-sults show that the use of admittance functions strongly influence the ductility demand of struc-tures. It was also shown that the ductility demand of the structure varies significantly with the damping ratio. More specifically, it was found that a 1% damping ratio (including the aerody-namic damping) is a coherent and conservative value to be used for parametric studies on medi-um-to-high-rise structures in order to establish a relation between the ductility demand and the strength reduction factor for structures subjected to extreme wind loadings.
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