Shaking Table Experimental Study of Multi-story Vibration Control System Based on Pulley Mechanisms
摘要
The paper presents a comprehensive overview of the primary results from an extensive experimental program of shaking table tests conducted to develop a passive vibration control system based on the pulley amplification mechanism. The newly proposed Pulley Damper Multi-story System (PDMS) is designed to efficiently accommodate inter-story drifts across successive stories and further enhance the energy absorption capacity of individual dampers. The fundamental concept of the PDMS involves amplifying inter-story displacement using a pulley mechanism and delivering the cumulative amplified displacement of the several story to the single damper positioning at the system top via a continuously stretched wire throughout the entire structure, from the foundation to the top. The experimental tests aimed to compare the behavior of the structure employing the proposed system and to determine the optimal system arrangement, as the wire installation layout significantly influences wire movement and can affect the displacement of the connected damper. A total of nine test cases on the six story shear deformation specimen were prepared, with and without the presence of wire or/and damper, including the wire installation layout optimized for first and second vibration mode shapes. The shaking table test results demonstrate that the PDMS effectively delivers the cumulative amplified inter-story displacement to the damper. Additionally, it was observed that the PDMS with one damper and one continuous wire running from the base to the third and then to the sixth stories provides a comparable seismic reduction effect to original pulley damper systems where two discontinuous wires and dampers are separately installed between the base and the third stories and between the third and sixth stories.