Abstract
A previous study proposed a seesaw-twisting system (STS) that works in conjunction with a cylindrical steel slit damper (CSSD) by utilizing the torsion of the seesaw member. This study investigated the seismic performance of an STS using a three-story steel moment frame as a prototype building. The seismic response analyses focusing on a typical STS configuration were first performed. The peak inter story drift angles were examined under variations in the beam section, system stiffness and strength, and system specifications. An important characteristic of an STS is its ability to enable the use of long steel rods for bracing between the seesaw member and frame connections spanning multiple stories. Thus, additional frames with four distinct STS configurations were analyzed to examine the peak story drift angles and plastic hinge formation. The effect of the amplification factor on the seismic response of the frame with diverse configurations was discussed. The results showed that the STS with the CSSD efficiently reduced peak story drifts.
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