Verification of multi-level SMA/lead rubber bearing isolation system for seismic protection of bridges

Deng, Jiang; Hu, Fulong; Ozbulut, Osman E.; Cao, Sasa

doi:10.1016/j.soildyn.2022.107380

Cited by 30 publications

(17 citation statements)

References 28 publications

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Section: Introductionmentioning

confidence: 99%

“…As an effective re-centering and damping measure, shape memory alloy (SMA) has been studied for its feasibility and effectiveness using in re-centering and energy dissipation devices [35][36][37][38][39][40][41][42][43][44]. Superelastic SMA has been widely investigated for the performance enhancement of bridges [35,[40][41][42][43][44]. For example, the SMA-cable-restrained high-damping rubber bearing developed by Fang et al [43] has been first adopted in Datianba #2 bridge constructed in Yunnan Province, China, effectively demonstrating the real-world application of SMA for seismic protection of civil infrastructure.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the SMA-cable-restrained high-damping rubber bearing developed by Fang et al [43] has been first adopted in Datianba #2 bridge constructed in Yunnan Province, China, effectively demonstrating the real-world application of SMA for seismic protection of civil infrastructure. In view of the effectiveness of incorporating the SMA with different isolators for response mitigation [14,[42][43][44][45][46][47][48][49][50][51][52], the advantages of the SMA, i.e., superelastic re-centering and energy dissipation, show the promising prospect of application in structural seismic resilience enhancement [33,43]. Particularly, several superelastic seismic isolators, e.g., superelastic flat sliding bearing [47][48][49][50][51][52] and superelastic friction pendulum [14,[53][54][55][56][57], in which the friction-based isolators are incorporated with the SMA wires/ cables, have been investigated and seismic performances have been analytically and experimentally demonstrated.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Superelastic Conical Friction Pendulum Isolator for Seismic Isolation of Bridges under Near-Fault Ground Motions

Zheng

Tan

et al. 2023

Structural Control and Health Monitoring

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To improve the seismic performance of bridges, this study develops a novel superelastic conical friction pendulum isolator (SCFPI) by incorporating an improved conical friction pendulum isolator (CFPI) with shape memory alloy (SMA). The flat sliding function designed for the improved conical friction pendulum isolator is to enhance the adaptability under service loadings. The analytical model of the novel SCFPI is derived and the numerical model is developed within the OpenSees platform to investigate the hysteretic behavior under cyclic loadings. A cost-effective design method is proposed to design the SCFPI system for example bridges. The response mitigation efficacy of the novel SCFPI system is investigated using the optimum design parameters under near-fault ground motions. Several case studies are conducted to demonstrate the effectiveness of the novel SCFPI system and cost-effective design method. Results indicate that the cost-effective design method is particularly effective for parameter optimization of the novel SCFPI, which achieves effective mitigation for the displacement responses of the isolator and superstructure and also effectively controls the seismic force increment in piers. Case studies indicate the reliable re-centering capacity and mitigation efficacy of the SCFPI system for bridges under near-fault ground motions. The findings of this study contribute to upgrading structural resilience and promoting seismic applications as a reliable technical guidance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Superelastic Conical Friction Pendulum Isolator for Seismic Isolation of Bridges under Near-Fault Ground Motions

Zheng

Tan

et al. 2023

Structural Control and Health Monitoring

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“…The effectiveness of the SMA regarded as the damping and re‐centering devices for structural response control has been demonstrated 29–32 . Several studies have revealed that combining the SMA device with isolators is particularly efficient for residual displacement mitigation 33–39 . Particularly, considering the advantages of the SMA as damping and re‐centering components, several SMA‐based isolators, which combine the superelastic SMA wire/cables with the traditional friction isolators, have been examined for performance improvement of structures, for example, the SMA‐based pure‐friction sliding bearing, 38–44 SMA‐friction pendulum bearing, 45–49 which demonstrated the feasibility using the SMA device to enhance the structural seismic resilience.…”

Section: Introductionmentioning

confidence: 99%

“…[29][30][31][32] Several studies have revealed that combining the SMA device with isolators is particularly efficient for residual displacement mitigation. [33][34][35][36][37][38][39] Particularly, considering the advantages of the SMA as damping and re-centering components, several SMA-based isolators, which combine the superelastic SMA wire/cables with the traditional friction isolators, have been examined for performance improvement of structures, for example, the SMA-based pure-friction sliding bearing, [38][39][40][41][42][43][44] SMA-friction pendulum bearing, [45][46][47][48][49] which demonstrated the feasibility using the SMA device to enhance the structural seismic resilience. Note that when the pure-friction sliding bearing integrates with SMA, the lateral stiffness and re-centering capability are all dependent on the SMA device, [38][39][40] which means that the SMA device needs to be fabricated using much more amount of SMA wires than the SMA-friction pendulum bearing.…”

Section: Introductionmentioning

confidence: 99%

Multi‐stage superelastic variable stiffness pendulum isolation system for seismic response control of bridges under near‐fault earthquakes

Zheng

Tan

Liu

et al. 2022

Structural Contr & Hlth

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To improve the resilient capability of bridges, a novel multi-stage superelastic variable stiffness pendulum isolator (SVSPI) is developed by incorporating superelastic shape memory alloy (SMA) with the multi-stage variable stiffness pendulum isolator (VSPI), which featured with the favorable adaptability under service conditions and near-fault excitations. Based on OpenSees platform, the numerical model for novel multi-stage superelastic variable stiffness pendulum isolator is created. A fractional factor based design method is suggested for parameter optimization of the multi-stage superelastic variable stiffness pendulum isolator. The example bridges with the novel isolators are designed to conduct the seismic mitigation investigation under near-fault earthquakes. The effectiveness of the novel superelastic multi-stage variable stiffness pendulum isolator and suggested design method is further discussed by case study. Results show that the novel multi-stage superelastic variable stiffness pendulum isolator designed by the proposed fractional factor based design method can perform the dual control of the isolator residual displacement, girder displacement, and base forces in piers for bridges. The effectiveness of the multi-stage superelastic variable stiffness pendulum isolator with the optimal parameters is demonstrated by case study. The technical achievements can provide reliable basis for structural resilience enhancement and potential structural applications.

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Design, manufacturing, and testing of a hybrid self‐centering brace for seismic resilience of buildings

Shi

Lin

et al. 2023

Earthq Engng Struct Dyn

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This study explores the development of a shape memory alloy (SMA)-based hybrid self-centering brace that combines NiTi superelastic cables with viscoelastic dampers. First, the behavior of individual components of the hybrid self-centering brace, that is, SMA cables and viscoelastic damper is characterized under various experimental conditions. Then, three prototype hybrid self-centering braces with a maximum force capacity of 172 kN are designed and fabricated. The experimental tests are conducted to reveal the response of This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Verification of multi-level SMA/lead rubber bearing isolation system for seismic protection of bridges

Cited by 30 publications

References 28 publications

Superelastic Conical Friction Pendulum Isolator for Seismic Isolation of Bridges under Near-Fault Ground Motions

Superelastic Conical Friction Pendulum Isolator for Seismic Isolation of Bridges under Near-Fault Ground Motions

Multi‐stage superelastic variable stiffness pendulum isolation system for seismic response control of bridges under near‐fault earthquakes

Design, manufacturing, and testing of a hybrid self‐centering brace for seismic resilience of buildings

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