Abstract
When designing critical structures such as long-span structures and high-rise buildings, earthquake excitation in the vertical direction, in addition to the horizontal direction, should also be taken into consideration. Study on new devices that can mitigate and isolate multi-dimensional (including both horizontal and vertical) earthquake actions has a remarkable significance. A new kind of multi-dimensional earthquake isolation and mitigation device was recently developed, and experimental study on vertical performances of the device under different excitation frequencies and amplitudes has been carried out in this paper. The characteristics of the vertical properties including the initial stiffness, the energy dissipation stiffness, the energy dissipation per cycle and the vertical damping ratio changing with excitation frequency and amplitude were studied, and the formulas describing the characteristics were proposed. It can be concluded that the initial stiffness and the energy dissipation stiffness increase slightly with increasing frequency, while the energy dissipation per cycle and the damping ratio decrease slightly with increasing frequency, the initial stiffness, the energy dissipation stiffness and the damping ratio will decrease slightly with increasing excitation amplitudes, and the proposed formulas can describe the vertical properties of the multi-dimensional earthquake isolation and mitigation device changing with excitation frequency and amplitude.
Highlights
Earthquake can be considered as a complex multi-dimensional excitation covering horizontal, vertical and torsional components
This paper proposed a new kind of multi-dimensional earthquake isolation and mitigation device
In order to verify the effectiveness of the above formulas, the numerical results of the initial stiffness K1, the energy dissipation stiffness K2, and the vertical equivalent damping ratio ζ under 6 mm displacement amplitude with different frequencies are obtained by Eqs (7)–(9)
Summary
Earthquake can be considered as a complex multi-dimensional excitation covering horizontal, vertical and torsional components. Z. Xu et al / Experimental and numerical studies on vertical properties of a new multi-dimensional earthquake isolation of structures, while fewer devices are proposed to reduce the horizontal and vertical earthquake responses of structures simultaneously. A three-dimensional earthquake isolation device was proposed and tested under the horizontal and vertical loads, which consists of rubber bearing for horizontal earthquake isolation and sealed air cushion for vertical earthquake isolation [7]. Vertical tests and property analysis on this device under different excitation frequencies and amplitudes are carried out in detail in this paper It can be concluded from the experimental and numerical results that the multi-dimensional earthquake isolation and mitigation device has a fine energy dissipation capability, and excitation frequency and amplitudes have significant effects on energy dissipation properties of the device
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