A liquid spring–magnetorheological damper system under combined axial and shear loading for three-dimensional seismic isolation of structures
A liquid spring–magnetorheological damper system under combined axial and shear loading for three-dimensional seismic isolation of structures
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DOI：
10.1177/1045389x18783090
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发表时间：
2018-07
影响因子：
2.7
通讯作者：
S. Cesmeci;F. Gordaninejad;K. Ryan;W. Eltahawy
中科院分区：
文献类型：
--
作者：
S. Cesmeci;F. Gordaninejad;K. Ryan;W. Eltahawy
本文研究了一种用于三维隔震系统的故障安全、双线性、液体弹簧磁流变阻尼器系统的实验研究。该装置结合了可控磁流变阻尼、故障安全粘性阻尼和液体弹簧的特点，在一个单一的单元中作为建筑物隔离系统的垂直组件。双线液体弹簧特性在压缩和回弹模式下提供两种不同的刚度。在回弹模式下较高的刚度可以防止在摇摆模式下结构的可能倾覆。在实际应用中，该装置将与目前用于吸收水平地面激励的传统弹性轴承一起堆叠在一起。设计了一个实验装置来反映真实的加载条件。1/4比例的装置分别承受245 kN和28 kN的轴向动载荷（反映竖向地震激励）和恒定剪切力。结果表明，该装置在轴剪联合载荷下运行良好，与理论计算结果吻合较好。
This study focuses on experimental investigation of a fail-safe, bi-linear, liquid spring magnetorheological damper system for a three-dimensional earthquake isolation system. The device combines the controllable magnetorheological damping, fail-safe viscous damping, and liquid spring features in a single unit serving as the vertical component of a building isolation system. The bi-linear liquid spring feature provides two different stiffnesses in compression and rebound modes. The higher stiffness in the rebound mode prevents a possible overturning of the structure during rocking mode. For practical application, the device is to be stacked together along with the traditional elastomeric bearings that are currently used to absorb the horizontal ground excitations. An experimental setup is designed to reflect the real-life loading conditions. The 1/4th-scale device is exposed to combined dynamic axial loading (reflecting vertical seismic excitation) and constant shear force that are up to 245 and 28 kN, respectively. The results demonstrate that the device performs successfully under the combined axial and shear loadings and compare well with the theoretical calculations.