Influence of the Shape of Slit of a Circular Hollow Steel Damper on its Energy Dissipation Capacity

Resumo

This research studies the effect that the shape of slits of a circular hollow steel (CHS) damper has
on its EDC, whose computation is raised in a hysteresis diagram obtained from a tridimensional non -linear
dynamic element finite analysis in Abaqus. A cyclic displacement protocol attending inte rnational normative is
used to induce cyclic displacement in the upper part of the device while the bottom part is considered fully
restrained. The model considers the presence of large deformations in the device as a result of the yielding in the
material. Only one configuration for the geometry (predefined thickness and external diameter) the CHS is
analyzed, but a total of 5 different shapes for the slits are considered (horizontal, vertical, circular, square and

triangular shapes). All the slits configuration presents the same void area in order to obtain a fair comparison. A-
36 steel is used for the damper as present good ductility characteristics. Finally, the performance of each CHS

damper configuration is analyzed from the characteristics of their hysteresis diagram, the stress distribution
through the damper and their EDC. It was concluded that the model with circular slits was the one that presented
the highest dissipation capacity, since this type of groove favors the distribution of stresses in its contour, unlike
the others whose vertices generate stress concentrators.