Abstract
In this study, a series of shaking table tests of a ten storey concrete suspended structure equipped with viscous dampers were carried out to evaluate the dynamic responses and vibration damping performance of suspended structures. The effects of link types between the primary structure and suspended floors and different seismic excitations on the response of suspended structure models was verified. The responses include the damping ratio, the frequency, maximum relative displacements, accelerations and maximum strains of the suspended structures. Test results showed that the damping ratio and the frequency of suspended structures installed with dampers (called damping suspended structure) are adjusted compared with a conventional suspended structure with rigid-bar links (conventional suspended structure). Maximum relative displacements of the primary structure of the damping suspended structure were distinctly smaller than those of the conventional suspended structure. However, the maximum relative displacement between the primary structure and the suspended floors of the damping suspended structure was significantly larger than that of the conventional structure, indicating that the swing of the suspended floor can help dissipate seismic energy. The peak acceleration and acceleration amplification factors of the damping suspended structure were less than the conventional suspended structure. Moreover, the peak acceleration response of the damping suspended structure was slightly behind the conventional suspended structure. The damping suspended structure certainly had a considerable and stable reduction for strain response, and the maximum strain response was decreased by 42.3%–72.7% for the damping suspended structure compared with the conventional suspended structure.
Highlights
Suspended structures containing structural art in nature have profound architectural artistic connotations and are expressions of structural beauty, which achieves the harmonic unification of structure and architecture, function and art, power and beauty, and has attracted the focus of many architects and engineers [1,2,3]
The slight, visible deformation produced during the vibration process was quickly restored, which indicates that the test models were in the elastic working phase. These results suggest that the seismic-resistant performance of the test models was superior, and the structure system, especially the damping suspended structure system, can satisfy or even surpass the requirement for “no damage under frequent earthquake, repairable damage after an occasional earthquake, and no collapse when subjected to a rare earthquake,” as described in the code for seismic design of buildings [24]
The representative white noise excitation cases input in the X direction of the structural model were selected, and the natural frequencies and vibration mode characteristics of the two structural models were obtained by analysing the time history response, spectral characteristics and transfer function of each acceleration point
Summary
Suspended structures containing structural art in nature have profound architectural artistic connotations and are expressions of structural beauty, which achieves the harmonic unification of structure and architecture, function and art, power and beauty, and has attracted the focus of many architects and engineers [1,2,3]. Many theoretical studies have been carried out on the damping performance of suspended to establish an analytical model of the high-rise mega-frame suspended structure system, and structures. Very structure system to high-rise buildings, studied the structural vibration control method compatible with limited theoretical and experimental research has been conducted in this area, existing research its outcomes dynamic indicate characteristics, established suspended an algorithm for thehas lateral stiffness of theperformance. To studyThe theresearch seismic performance of tallshows or a perfect fit for thescale concept the on bestshaking structural of these people that high-rise buildings These shaking table tests have provided important references for the present mega-frame suspended structure systems have good shock absorbing performance. Many researchers, including Lu [17,18] and Ario Ceccotti [19], have conducted scale model tests on shaking tables to study the seismic performance of tall or high-rise buildings.
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