| Summary: | 碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 105 === Seismic damages of steel special moment resisting frame are mostly concentrated on connections. Development of plastic hinges, local buckling or fractures of connections would affect the functionality of the building and would cost a lot for repairing works, especially for column base. Self-centering steel column base has been proposed, and mostly uses the posttension member to provide the restoring moment. However, this will increase axial loading of the column. This study proposed a new type of column base which combines the new proposed asymmetrical friction damper and column axial force coming from the long-term loading. By controlling the axial force and bolt hole diameters of the bolts of the asymmetrical friction damper, the damper could exhibit a larger loading friction force than the unloading one. So the combination of damper force and the restoring moment coming from the column axial loading would present a hysteretic loop with self-centering behavior and energy dissipation ability.
Test results show that the asymmetrical friction damper could perform the expected behavior. The full-scale column base cyclic bending test indicated that the connection could sustain drift angle up to 4% while the maximum strength reached 80% of the full plastic moment of the column. The hysteretic loop shows a stable and self-centering behavior without any deterioration. The test values meet the evaluation values obtained from the mechanical model very well.
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