No abstract

This study deals with a shake table test on a three-story base-isolated steel frame. The frame rests on four roller bearings for isolation and is equipped with four laminated rubbers as shear spring. An MR damper is used in the test to perform semi-active seismic response control. The basic control algorithm applied in the study is to simulate the load-deflection relation of an Qrigin-iestoring friction pamper (ORFD) which is a sort of friction damper that looses its resistance when it moves toward the origin, making sure for the base-isolated system to minimize residual displacement even after an extremely strong ground motion. Also attempted is a hybrid type control that superposes viscous damping on the ORFD when the damper moves from the peak displacement toward the origin.

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The variable dmper using Magneto −Rheologica田 uid (MR darnper) Ghangos iIs damping 正 豆 rce by changingthe ma 即 etiG 五eld acdng Qn 山 e MR fluid according to an ele σtric σu 国 YenL 呂 en1 重 一 acti ＞ e controt using such a variable damper stabilizes bund 孟 ng respenses in an ea 曲 quake better t ｝ 1an the

No abstract