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

Liu, Wenguang; Xu, Hao; He, Wenfu; Yang, Qiaorong

doi:10.1061/(asce)st.1943-541x.0002195

Cited by 26 publications

(7 citation statements)

References 23 publications

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“…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.…”

Section: Hybrid Multi-dimensional Mitigation and Isolation Devicementioning

confidence: 99%

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Recent Advances in Multi-Dimensional Vibration Mitigation Materials and Devices

Chen

Zhou

et al. 2019

Front. Mater.

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Harmful vibrations can cause many engineering problems, such as disasters of civil engineering structures, failure of precision equipment, and the disruption of some spacecraft components. In most situations, the vibrations are usually three-dimensional excitations. Therefore, research on multi-dimensional vibration control has become a worldwide hotspot in engineering. This article presents a comprehensive assessment of recent developments of multi-dimensional vibration mitigation devices and the material applied in such devices. The vibration mitigation materials mainly include the passive vibration mitigation materials and smart vibration mitigation materials. Subsequently, the vibration mitigation devices in civil engineering, mechanical engineering, and aerospace engineering are reviewed and commented, respectively. Above all, the multi-dimensional vibration mitigation devices and materials are found to be effective for reducing multi-dimensional vibrations. However, enhancing the mitigation performance of the devices in each direction, including improving the mitigation capability of materials, is still a challenging issue.

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Section: Hybrid Multi-dimensional Mitigation and Isolation Devicementioning

confidence: 99%

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

Section: Hybrid Multi-dimensional Mitigation and Isolation Devicementioning

confidence: 99%

Recent Advances in Multi-Dimensional Vibration Mitigation Materials and Devices

Chen

Zhou

et al. 2019

Front. Mater.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Shi

Wang

Zhang

et al. 2023

Earthquake Engineering and Resilience

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base isolation can significantly improve the seismic performance of structures. However, significant 3D movement coupling and rocking behavior of the superstructure due to the high gravity center of the structure can be observed, which will lead to a complex design of the isolation system and the isolators. In addition, as the 3D isolators are installed beneath the structures, they need to support the heavy weight of the superstructure with low vertical stiffness. It is difficult to meet both the vertical load and stiffness design demands of the isolators using traditional isolation materials and mechanisms, especially for large-size structures. A separated 3D isolation scheme is proposed by installing the horizontal isolation at the base of the superstructure and the vertical isolation under the floor slabs. Simulations are carried out to examine the dynamic responses including the acceleration, inter-storey drift, and stress of structural members of a typical steel frame structure with the separated 3D isolation scheme. The isolation effect was also studied by shaking table tests of a two-storey steel frame structure.

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Shaking table test of a steel frame structure with layered three‐dimensional isolation

Shi,

Wang,

Wang

et al. 2024

Earthq Engng Struct Dyn

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A three‐dimensional (3D) base isolation system can enhance the seismic performance of steel frame structures. However, the notable coupling effects and rocking behavior in the superstructure will complicate the design of base isolators and weaken the seismic resilience of the 3D base isolation system. To realize the 3D isolation function and constrain the coupling effects and rocking behavior of steel frame structures simultaneously, a layered 3D isolation system is proposed through the combination of a horizontal base isolation with friction pendulum bearings and a vertical floor isolation with steel coil springs installed beneath the floor slabs. A series of full‐scale shaking table tests of a two‐storey steel frame structure were conducted to verify the effectiveness of the proposed system. The test results indicate that the layered 3D isolation system with flexible horizontal displacement constraint devices decoupled the horizontal and vertical motions of the superstructure and improved the seismic behavior of steel frame structures. The horizontal–rocking coupling effects of the superstructure typically associated with traditional 3D base isolation were significantly suppressed. Due to the vertical acceleration isolation effects, the layered 3D isolation system led to stabler normal pressures on the friction pendulum and lower friction forces compared to the horizontal base isolation system, which mitigated the horizontal–vertical coupling effects of the structure and the stick‐slip motions of friction pendulums to result in higher horizontal acceleration isolation effects and self‐centering capacities. The unfavorable influence of elevating the floor slab on the seismic behavior of the superstructure was compensated by the horizontal isolation at the base.

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

Cited by 26 publications

References 23 publications

Recent Advances in Multi-Dimensional Vibration Mitigation Materials and Devices

Recent Advances in Multi-Dimensional Vibration Mitigation Materials and Devices

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

Shaking table test of a steel frame structure with layered three‐dimensional isolation

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