فرزاد حاجی رضایی

Steel slit damper is a replaceable and repairable tool that is made of a standard section with a number of slits in its core. The mechanism of this type of damper is such that before the bracing member buckles, the slit damper yields and the buckling instability of the brace is removed from the frame. In this study, the cyclic performance of the seesaw energy dissipation system with a slit damper with fixed and ellipse cavity in ABAQUS software has been investigated. The fundamental concept of the seesaw system is the quasi-linear motion mechanism, which enables the bracing members to remain in tension during vibration. In The following, the assessing and comparing the stiffness, the final strength and the amount of energy absorption of the samples are conducted. The results showed that by reducing the distance between the cavities of damper, the position of maximum stress occurs in the web plate of damper between slits and close to the sides and part of it near the flange plates. Further increase in the curvature of the holes reduced the amount and yield range of the damper so that the yielding range tended to the boundary of the slit walls. Also, by increasing the thickness by 40%, a similar result was obtained with the increase in the curvature of the holes, so that the entire distance is yielded between the cavities of damper on the sides.