Buckling Response and Elastic Stiffness of Butterfly Dampers

Document Type : Research Article


Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES)


Butterfly dampers dissipate energy through the flexural, shear, or axial response of
the strips when the device is subjected to inelastic cyclic deformation. The buckling
response, elastic stiffness, and cyclic performance of non-uniform steel butterfly
dampers have been studied in this paper. Validated material and geometric nonlinear
finite element models in the ABAQUS has been used to perform a comprehensive
parametric study on a wide range of geometrical parameters to evaluate the
response of non-compact butterfly dampers. The results showed that although the
low-cycle-fatigue response of butterfly dampers can be improved by altering the side
edge shapes, the buckling capacity and elastic stiffness of non-uniform strips would
decrease in comparison with uniform ones. Hence several analytical equations were
provided to quantitative prediction of the buckling capacity and elastic stiffness of
butterfly dampers.


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