Static Test and Seismic Dynamic Response of an Innovative 3D Seismic Isolation System

Recent Advances in Multi-Dimensional Vibration Mitigation Materials and Devices

“…Liu et al (2018a) analyzed the excellent property of a separation type three-dimensional isolation system with multiple guide rails to decouple horizontal and vertical motion, which indicates that the system not only displays desirable isolation but also contributes significantly to resist the overturning moment. Liu et al (2018b) studied the property of a new multi-dimensional device using several inclined lead rubber bearings to decompose vertical seismic action, as shown in Figure 3. From the analysis of dynamic properties such as vertical acceleration, it is found that the seismic response is largely reduced compared with that of fixed-base structures.…”

“…FIGURE 3 | The 3D structural diagram and the mathematical model of the inclined lead rubber bearings (Liu et al, 2018b).…”

Seismic performance analysis of steel frame structures with separated three‐dimensional isolation

“…However, it becomes very costly and difficult for the long period 3D isolator to carry heavy vertical load because of the stability problem and limited material properties of the isolator. To date, the 3D base isolation is mainly discussed and used in critical facilities and structures with relatively light weight, such as nuclear power plants, [10][11][12][13][14][15] long-span spatial structures, [16][17][18] low-rise frame structures, 19 and important equipment such as power transformers. 20 Another challenge for the 3D base isolation is that the overturning moment generated by the horizontal inertia forces of the superstructure under earthquakes causes the coupling of 3D motions and rocking behaviors of the structure, especially when the vertical isolation period is long and the height-to-width ratio of the structure is large.…”

“…Many types of 3D and vertical isolators such as rubber bearings, steel spring bearings, air spring bearings, and so on, were developed and investigated. [9][10][11][12][13][14][15][16][17][18][19][20] Generally, to effectively mitigate the vertical seismic responses, a relatively low vertical stiffness of the 3D base isolator is desired to extend the vertical natural period of the structure from the dominant period range of the vertical excitations. However, it becomes very costly and difficult for the long period 3D isolator to carry heavy vertical load because of the stability problem and limited material properties of the isolator.…”

“…However, it becomes very costly and difficult for the long period 3D isolator to carry heavy vertical load because of the stability problem and limited material properties of the isolator. To date, the 3D base isolation is mainly discussed and used in critical facilities and structures with relatively light weight, such as nuclear power plants, 10–15 long‐span spatial structures, 16–18 low‐rise frame structures, 19 and important equipment such as power transformers 20 …”