Seismic behavior of rocking base-isolated structures

Cheng, Chin-Tung; Chao, Chih-Hung

doi:10.1016/j.engstruct.2017.02.027

Cited by 11 publications

(5 citation statements)

References 20 publications

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“…This model was considered to capture a rocking behavior in the mock-up, as shown by Borsoi et al, 21 DeJong and Dimitrakopoulos, 28 and Cheng and Chao. 29 Due to limited axial stiffness, P-FREIs generate rotational effects in the vertical plane that are not present in the simplified shear model. In Figure 8b, the lumped masses are shown, where m 1 , m 2 , and m 0 are the slab masses and the mass of the isolators whose contribution is negligible.…”

Section: Dynamic Model With Rocking (Ns 12 )mentioning

confidence: 99%

“…After a static condensation of both stiffness and mass matrices has been performed (Figure 8), the model involves 12‐DoF and is denoted as

N S_{12}

. This model was considered to capture a rocking behavior in the mock‐up, as shown by Borsoi et al, 21 DeJong and Dimitrakopoulos, 28 and Cheng and Chao 29 . Due to limited axial stiffness, P‐FREIs generate rotational effects in the vertical plane that are not present in the simplified shear model.…”

Section: Real‐time Hybrid Simulationmentioning

confidence: 99%

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Real‐time hybrid simulations including rocking effects: The case of a frame‐structure with unbounded elastomeric isolators

Riascos

Klopov

Losanno

et al. 2022

Structural Contr & Hlth

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Real‐time hybrid simulations (RTHS) have become an attractive alternative for the study of structural systems by conveniently separating an experimental substructure from a numerical component. Due to the technical and economic benefits of applying fiber‐reinforced elastomeric isolators (FREIs) in unbounded configuration, the analysis of this device using RTHS is gaining interest among researchers. However, there are aspects associated with the complexity of the unbounded isolators that alter the dynamic behavior of the structure. One of these aspects is the rocking effect, which generally is disregarded when conducting RTHS. This paper addresses the role of rocking effects in the representation of isolated structures through RTHS. The results of different RTHS architectures show that when rocking is not taken into account, the base displacement and interstory drifts can be underestimated by more than 50%. Results from the RTHS are compared to shaking table tests (STTs) of a mock‐up structure isolated with unbounded FREIs, with a maximum error less than 8% in peak and root‐mean‐square values of displacement and force.

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Section: Dynamic Model With Rocking (Ns 12 )mentioning

confidence: 99%

“…After a static condensation of both stiffness and mass matrices has been performed (Figure 8), the model involves 12‐DoF and is denoted as

N S_{12}

Section: Real‐time Hybrid Simulationmentioning

confidence: 99%

Real‐time hybrid simulations including rocking effects: The case of a frame‐structure with unbounded elastomeric isolators

Riascos

Klopov

Losanno

et al. 2022

Structural Contr & Hlth

View full text Add to dashboard Cite

show abstract

“…Different types of ground motions, including the short-period (high-frequency), the intermediate-frequency and the long-period (low-frequency) ground motions are utilized. The corresponding intermediate-frequency PGAs are set at three different levels, which represent minor, moderate, and major earthquakes at areas with basic seismic intensity degrees of 8 (9). The complementary numerical model of the novel isolation system is also proposed for further studies.…”

Section: Conclusion and Recommendationmentioning

confidence: 99%

“…This system was configured in detail to improve the seismic performance of the structure at the level of the foundation plan. Since then, a variety of seismic isolation bearings, such as: Derham et al [3], Robinson [4], Zayas et al [5], Costantinou et al [6], Uang and Bertero [7], Kelly [8] and many others [9][10][11][12], have been developed and implemented around the world to protect the building facing earthquakes. Meanwhile, some supplemental damping devices, e.g., nonlinear fluid viscous dampers, were used to control the seismic response of the base-isolated buildings.…”

Section: Introductionmentioning

confidence: 99%

Study on a Novel Variable-Frequency Rolling Pendulum Bearing

Pang

Tao

2022

Buildings

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Seismic isolation is a technique that has been widely used around the world to decouple the superstructure from the ground motions during earthquakes. However, the attention of seismic isolation is mostly focused on the protection of the building structures. Acceleration-sensitive devices or equipment, which are in desperate need of seismic protection, are still not fully emphasized. Meanwhile, the stiffness and frequencies of the conventional rolling- and sliding-type isolation bearings demonstrate an upward trend as the isolation layer displacement increases, which may bring self-centering and resonance issues. Thus, a novel variable-frequency rolling pendulum bearing is developed for the protection of acceleration-sensitive equipment. The rolling-type isolation bearing is selected to enhance the self-centering capacity, and additional viscous dampers are incorporated to improve the system damping. Moreover, the theoretical formulas of several typical variable-frequency rolling pendulum bearings are derived and presented to figure out the dynamic characterization of the device. The isolation efficiency of the proposed device under different parameters is also validated using shake table tests. Test results demonstrate that the newly proposed devices show excellent isolation performance at reducing both acceleration and displacement responses. Finally, the numerical model of this isolation system is proposed in detail. The simulated results, including relative acceleration responses, relative displacement responses and movement locus of the upper plates, are consistent with test results, which demonstrates this simplified model could be used for further studies.

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“…Common features are horizontal flexibility and energy dissipation capabilities (Sun and Li, 2010). Horizontal flexibility provides a natural frequency shift toward lower frequencies, away from dominant energy-containing frequencies (Cheng and Chao, 2017).…”

Section: Introductionmentioning

confidence: 99%

Performance-based dynamic optimal design for isolated structures with multiple-coupling friction dampers

Zou

Wenliuhan

Tan

2020

Advances in Structural Engineering

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Here, a two-coupling friction system with a multi-phase working mechanism was considered for 10-story buildings. Within the framework of performance-based seismic design, and based on refined fortification levels and target performance, three optimal models were established. The performance parameters of the isolation layer were used as design variables, and the displacement and the acceleration of the seismic response were used as performance objectives of the structure. Furthermore, sequential quadratic programming was used to solve the dynamic optimization problem of the nonlinear isolated structure. The numerical results illustrate that the optimization model, its formulation, and the proposed algorithms are both reasonable and effective. The two-coupling friction system installed at an isolation layer works in stages. The isolation layer meets the various target performances under different design criteria and different seismic action levels.

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Seismic behavior of rocking base-isolated structures

Cited by 11 publications

References 20 publications

Real‐time hybrid simulations including rocking effects: The case of a frame‐structure with unbounded elastomeric isolators

Real‐time hybrid simulations including rocking effects: The case of a frame‐structure with unbounded elastomeric isolators

Study on a Novel Variable-Frequency Rolling Pendulum Bearing

Performance-based dynamic optimal design for isolated structures with multiple-coupling friction dampers

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