Effects of friction variability on isolation performance of rolling-spring systems

Wei, Biao; Wang, Peng; Griffiths, D. Ll.; Jiang, Lizhong; Wen, Ying

doi:10.1007/s11771-016-3066-4

Cited by 18 publications

(14 citation statements)

References 11 publications

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“…When it comes to 2# pier fixed bearing, on the other hand, its horizontal ultimate bearing capacity decreased by 10% after the use of the seismic isolated bearing compared with the application of spherical steel bearing. Thus, under ground motion, damage energy borne by 1#, 3#, and 4# piers (non-braking piers) would increase, and, correspondingly, their damage probability would also increase [30,31]. At that time, due to the lowered damage energy borne by 2# pier, the damage probability under ground motion, therefore, would decrease for 2# pier.…”

Section: Comparative Analysis Under Different Bearing Typesmentioning

confidence: 99%

Seismic Vulnerability Evaluation of a Three‐Span Continuous Beam Railway Bridge

Wei

Dianbin

Jiang

et al. 2017

Mathematical Problems in Engineering

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In order to evaluate the seismic vulnerability of a railway bridge, a nonlinear finite element model of typical three-span continuous beam bridge on the Sichuan-Tibet railway in China was built. It further aimed at performing a probabilistic seismic demand analysis based on the seismic performance of the above-mentioned bridge. Firstly, the uncertainties of bridge parameters were analyzed while a set of finite element model samples were formulated with Latin hypercube sampling method. Secondly, under Wenchuan earthquake ground motions, an incremental dynamic method (IDA) analysis was performed, and the seismic peak responses of bridge components were recorded. Thirdly, the probabilistic seismic demand model for the bridge principal components under the prerequisite of two different kinds of bearing, with and without seismic isolation, was generated. Finally, comparison was drawn to further ascertain the effect of two different kinds of bearings on the fragility components. Based on the reliability theory, results were presented concerning the seismic fragility curves.

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Section: Comparative Analysis Under Different Bearing Typesmentioning

confidence: 99%

Seismic Vulnerability Evaluation of a Three‐Span Continuous Beam Railway Bridge

Wei

Dianbin

Jiang

et al. 2017

Mathematical Problems in Engineering

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“…As demonstrated in the related studies [16], the isolated structure can be built as a rigid body since the stiffness of the isolation device is far less than that of the structure. So in this paper, the superstructure is temporarily simplified to a rigid body, and its mass is set to be 300 t.…”

Section: Structure Modelmentioning

confidence: 99%

“…The author himself compiled a computer program to calculate the isolation system [16]. A great many of seismic responses are obtained for 560 calculation cases above.…”

Section: Calculation Casesmentioning

confidence: 99%

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Parameter optimization of damper-friction isolation systems using concave friction distribution

Wei¹,

Wang²,

Yan³

et al. 2016

J. vibroeng.

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The random friction distribution is an objective phenomenon and always leads to great uncertainty in seismic responses of damper-friction isolation systems. As to optimize the seismic performance, this paper artificially made the friction distribution on a contact surface to be concave. When the damper-friction isolation system was subjected to different ground motions, more regular responses, due to the concave friction distribution, were obtained comparing with the responses of the random friction distribution. The concave friction distribution is always conducive to reducing the structural relative displacement and insignificantly increasing the structural acceleration. An optimization design example of an isolation building was carried out. And the results showed that as for a structure only being sensitive to acceleration or force, significant concave friction distribution and little damping constant would be the best design combination. It resulted in a much less acceleration and an acceptable relative displacement on the structure.

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“…Many viscous damper-spring or other similar devices, such as rubber bearings combined with viscous dampers, have been invented and researched to reduce structural seismic damages in recent decades. However, these devices are often interfered by a frictional action, when the devices or isolated structures contact with other objects [1]. For example, a horizontal contact surface is often used to support long-term service loadings [2].…”

Section: Introductionmentioning

confidence: 99%

Performance-based seismic isolation design using the theory of spatially concave friction distribution

Li¹,

Wei²,

Li³

et al. 2020

J. vibroeng.

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Seismic isolation devices were designed to protect three similar building structures, containing different objects with different fragilities, in a strong earthquake region. And a performance-based assessment framework, established by the PEER, was used to identify the seismic isolation efficiency of these devices. It optimized the ratios of spring part, viscous damping part and friction part in the seismic isolation devices, aiming at different functional buildings. Results show that a spatially concave friction distribution, combined with a weak spring, not only can reduce the structural acceleration response during earthquakes, but also decrease the structural residual displacement after earthquakes. Moreover, the spatially concave friction distribution can dissipate earthquake energy, but cannot hinder the recentering of structure like that of general uniform friction distributions. Consequently, the spatially concave friction distribution can partly or fully replace the viscous dampers, which are more expensive and short-lived. The reasonable combination of different components in the seismic isolation devices can satisfy different seismic requirements, aiming at different functional buildings.

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Effects of friction variability on isolation performance of rolling-spring systems

Cited by 18 publications

References 11 publications

Seismic Vulnerability Evaluation of a Three‐Span Continuous Beam Railway Bridge

Seismic Vulnerability Evaluation of a Three‐Span Continuous Beam Railway Bridge

Parameter optimization of damper-friction isolation systems using concave friction distribution

Performance-based seismic isolation design using the theory of spatially concave friction distribution

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