Abstract
A tuned mass rocking wall (TMRW)-frame structure system is proposed to improve the energy dissipation ability of the traditional rocking wall-frame system. Based on the energy dissipation principle of the traditional tuned mass damper (TMD), a TMRW is designed with proper mass and stiffness according to the dynamic characteristic of the host structure. Firstly, considering the presence of inherent structural damping, the dynamic amplification factor of the main mass was derived from the dynamic equations of the TMRW mechanism. A practical design table was then obtained after parameter study. Secondly, by taking a six-story frame structure as an example, the dynamic time-history analysis was conducted to study TMRW’s seismic performance. The inter-story drift ratios of the TMRW-frame, the traditional rocking wall-frame, and the frame structures were compared, and the seismic responses of the controlled and uncontrolled structures were also compared. The results demonstrate that the TMRW can effectively reduce the inter-story displacement of the host structure, and the lateral deformation mode of the host structure tends to be more uniform. However, compared with the traditional rocking wall-frame system, the proposed TMRW has less ability on coordinating deformation.
Highlights
A rocking wall-frame structure system is composed of a frame and a rocking wall that has limited rotation constraints at the bottom
The second author of this paper proposed a tuned mass rocking wall (TMRW)-frame structure system based on the energy dissipation principle of the traditional tuned mass damper (TMD) [14]
Taking the six-story frame structure as an example, the dynamic time-history analysis is conducted to investigate the seismic performance of the TMRW-frame structure
Summary
A rocking wall-frame structure system is composed of a frame and a rocking wall that has limited rotation constraints at the bottom. The rocking wall has difficulty reducing the inter-story displacement of the frame structure, and may even amplify the displacement responses of the host structure. With the protection of the rocking wall and energy dissipation devices, damage to the host structure can be significantly reduced. Feng et al [9] proposed a rocking wall-frame structure with buckling-restrained braces in base to suppress the displacement responses of the structure when subjected to a strong earthquake. Guo et al [10] examined the influence of the distributed control devices (e.g., dampers installed at each floor level) on the seismic responses of rocking wall-frame structures. A six-story frame structure is taken as an example, the seismic responses are compared with those of the rocking wall-frame system, as well as the proposed TMRW system.
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