| Summary: | The effect of seismic loading on structures has become a main concern due to the number
of collapses or incidents of substantial damage during recent earthquakes. The inelastic behavior
of a fastener under seismic loading is a determinant factor of the response of the whole structure;
hence, the dynamic behaviour of the fasteners is a main issue for study. The objective of this
research is to compare the response of a fastener predicted by a finite-element model (HYST)
and the empirical Bouc-Wen-Baber-Noori model (BNW).
HYST is a mechanics-based model that uses material properties of the fastener and the
characteristics of its surrounding medium to predict the response. BNW is a mathematical model
involving 13 parameters. The hysteretic results calculated by this model are obtained by
integration of a first order differential equation, given a displacement history A(t).
The BNW parameters are calibrated using the response to a particular cyclic
displacement history, and then the responses are evaluated for other different histories or seismic
excitations. Results are compared to the corresponding HYST outputs. The results show that
BNW gives comparable values for relative maximum displacements with respect to the medium,
and restoring forces when the response of the structure remains elastic. However, the
discrepancies increase with nonlinearities, and the model cannot accurately predict, for example,
the residual deformations.
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