| dc.description.abstract | This study investigated the seismic performance of a scoured bridge with exposed pile foundation and the feasibility of the semi-active control system with MR(Magneto-rheological) damper by dual biaxial laminar shear boxes and shaking table tests. In this study, the experimental testing was divided into a scoured bridge with exposed pile foundation and a bridge without pile foundation. The pile is designated to be scoured as a ratio pile diameter (D) at either hinge-end (H) or roller-end (R). The bridge without pile foundation was bolted on the shaking table (Fix). Category: H0D-R0D, H0D-R3D, H3D-R3D,H3D-R6D, H6D-R6D and HFix-RFix. There were three structure control methods in this study, they were uncontrolled, passive control and semi-active control. The input ground motions included acceleration records from El Centro (PGA 350 gal), Chi-Chi earthquake TCU076 station (PGA 200 gal), and artificial TCU076 (PGA 200 gal).
According to experimental and analytical results, the structural period changed longer gradually when the scoured depth increased, but acceleration of the deck decreased as the scoured depth increased. The semi-active control system with the sliding mode control could effectively reduce the displacement of the deck from the experimental testing of the scoured bridge. Compared with uncontrolled bridge, the semi-active control could decrease about 30% displacement of the deck under the Chi-Chi earthquake TCU076 station (PGA 200 gal).
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