Abstract
A tuned mass rocking wall (TMRW) is a passive control device that combines the merits of a traditional tuned mass damper (TMD) and a traditional rocking wall (RW). TMRWs not only help avoid weak story failure of the host structure but can also be regarded as a largely tuned mass substructure in the building structure. Through the appropriate design of the frequency ratio, the host structure can dissipate much more energy under earthquake excitations. In this paper, the basic equations of motion for the mechanical model of an SDOF structure-rigid rocking wall are established, and the optimization formulas of frequency ratio and damping ratio of TMRW are derived. Through the dynamic elastoplastic analysis of a six-story TMRW-frame model, the applicability of the derived parameter optimization formulas and the effectiveness of the TMRW in seismic performance control are investigated. The results demonstrate that the TMRW can coordinate the uneven displacement angle between stories of the host structure. Additionally, the TMRW is found to possess the merit of reducing both the peak and root-mean-square (RMS) structural responses when subjected to different types of earthquake excitations.
Highlights
Concrete frame structures can collapse due to yield failure from earthquake excitation [1]
If some damping is added to tuned mass rocking wall (TMRW), the performance deterioration caused by the change of excitation frequency can be improved
The results show that the original frame structure, uncontrolled with rocking wall (RW)
Summary
Concrete frame structures can collapse due to yield failure from earthquake excitation [1]. Based on the damage concentration mode, Feng et al [10] proposed strengthening the RW with buckling-restrained braces (BRB) so that the RW can control the deformation mode and the BRB can provide lateral stiffness and hysteretic damping, which can give full play to the seismic capacity of each part of the structure. Chen et al [11,12] proposed a rocking structure with a displacement damper set at the bottom of the rocking steel truss to improve the seismic performance of the structure. The basic equations of motion for the controlled structure are established through the mechanical model of SDOF structure-rigid rocking wall, and the calculation method of frequency ratio and connection stiffness between the RW and the host structure is determined. The applicability of the designed formulas of TMRW and the superiority of seismic performance are verified according to the structural responses under earthquake excitations
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