Influence of Multidirectional Cable Restrainer on Seismic Fragility of a Curved Bridge

Guo, Junjun; Zhong, Jue; Dang, Xiaohong; Yuan, Wancheng

doi:10.1061/(asce)be.1943-5592.0001352

Cited by 20 publications

(15 citation statements)

References 52 publications

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“…It has found that unseating prevention devices with a smaller initial clearance and a more substantial cable length (with a lower cable stiffness) were more efficacious [23,26]. Therefore, according to the actual conditions of the bridge, an unseating prevention device with an initial clearance of 8 cm (slightly less than the allowable deformation of the bearing, which is 8.12 cm), and a length of 2 m was selected as the ultimate seismic control measure to coordinate with the limit device.…”

Section: Selection and Simulation Of Unseating Prevention Devicesmentioning

confidence: 99%

“…To investigate the relationship between the seismic responses of the bridge and the seismic intensity, as well as the seismic method of pounding damage, the intensity of earthquakes used in this paper increases stepwise; earthquakes with an exceeding probability of 63.2%, 10%, and 2% in 100 years (small, moderate, and large earthquakes) and the Northridge earthquake in the United States are considered [26]. Figure 5 show the time histories of the small, moderate, large, and the Northridge earthquakes.…”

Section: Earthquakesmentioning

confidence: 99%

“…The researchers used experiments [7,8] and numerical simulation techniques to study different seismic measures, such as concrete shear keys [9][10][11], steel bar restrainers [12,13], cable restrainers [7,14], viscoelastic dampers, and innovative devices [15,16]. Numerical simulation techniques (including quasi-static [17][18][19], the seismic design method [20][21][22], and dynamic simulation [23][24][25][26]) are widely used for anti-seismic research on the prevention of pounding and unseating because of their advantages that they consume few resources and acquire a large amount of physical information.…”

Section: Introductionmentioning

confidence: 99%

“…The results show that the restrainers could remain functional and limit the relative displacement within a design value during earthquakes. Guo et al [26] studied a multidirectional cable restrainer on the seismic fragility of a curved bridge, and their results indicate that multidirectional cable restrainers can remarkably decrease the failure probability of a bridge subjected to a strong earthquake, and that a pier with fixed bearings will experience severe axial forces. Some researchers compared the seismic performance of seismic measures in limiting the relative displacements of the bridge; the studies indicated that all the devices could control the bearing deformation to a safe limit if they were designed correctly [27,28].…”

Section: Introductionmentioning

confidence: 99%

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Seismic Effectiveness of Multiple Seismic Measures on a Continuous Girder Bridge

Shi

Liu

2020

Applied Sciences

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Seismic hazards, such as bridge pounding, unseating, collapse, etc., cause significant economic losses and affect traffic and safety. Research on seismic measures, such as limiting and unseating prevention devices for the bridge, can effectively prevent damage to the bearings, such as excessive displacement, the pounding of the beam end, etc., in an earthquake. In this paper, the dynamic time-history analysis method was used to study the mechanical behaviors of the bridge structure, such as its seismic performance, structural displacement, pier bending moment, etc. We found that different combinations of seismic measures can effectively reduce the displacement at the bridge expansion joint and bearings. The joint application of an expansion device, restrainer, and unseating prevention devices shows the best limiting effect on bridge displacement and expansion joint displacement. The maximum reduction of bridge expansion joint displacement reaches 48% and is within the allowable deformation range of an expansion device in a large earthquake, and the maximum reduction of bearing displacement reaches 34%, which only slightly exceeds the shear deformation of the bearing. The expansion device, restrainer, and unseating prevention devices have smaller internal forces in this case than other cases, without damage. In contrast to the previous studies on single seismic measures of unseating restrainers, this study investigates the combination of multiple seismic measures and earthquakes of various magnitude. It reveals the catastrophe process of the bridge structure and the cooperation law of seismic measures in an earthquake.

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Section: Selection and Simulation Of Unseating Prevention Devicesmentioning

confidence: 99%

Section: Earthquakesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic Effectiveness of Multiple Seismic Measures on a Continuous Girder Bridge

Shi

Liu

2020

Applied Sciences

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“…However, considering the high flexibility of isolation bearings, the isolated bridges may experience a large displacement under strong earthquakes, and consequently, they are susceptible to unseating problems (Ozbulut and Hurlebaus, 2011). In this regard, supplemental restraining devices in combination with isolation devices can be provided in order to efficiently protect such structures (Guo et al, 2019; Wang et al, 2019b).…”

Section: Introductionmentioning

confidence: 99%

Performance-based seismic loss assessment of isolated simply-supported highway bridges retrofitted with different shape memory alloy cable restrainers in a life-cycle context

Dezfuli²,

Wang

et al. 2020

Journal of Intelligent Material Systems and Structures

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Shape memory alloy cables have emerged as an alternative to conventional steel cable restrainers for preventing the bridge spans from unseating during an extreme earthquake. Feasibility of high-cost NiTi shape memory alloy restrainers in retrofitting the bridges has been numerically investigated, and promising results have been published; however, considering the economic impacts, the effect of different types of shape memory alloy such as Cu-based and Fe-based shape memory alloy restrainers has not been discussed yet. The objective of this study is to address this problem in detail in order to propose the most cost-effective shape memory alloy restrainer suitable for bridge engineering applications. Seismic fragility and life-cycle loss (both direct and indirect) assessments are analytically performed on an isolated simply-supported highway bridge retrofitted by four types of shape memory alloy restrainers (i.e. NiTi, FeNiCoAlTaB, CuAlMn, and FeMnAlNi). Results showed that for all retrofitted bridges performed in the range of design displacement, the effect of type of shape memory alloy is significant on the damage probability and long-term seismic loss of the bridges. All the bridges retrofitted with shape memory alloy restrainers have a very low probability of collapse (less than 7%). It is also found that the bridge retrofitted with Fe-based shape memory alloy restrainers (SMA-II and SMA-IV) performed better as compared to the other cases. Compared to the bridge without restrainers and with NiTi shape memory alloy restrainers, Fe-based shape memory alloy restrainers can reduce the long-term loss by about 87% and 11%, respectively, at the design earthquake event specified in CHBDC-2014. The probabilistic risk analysis of highway bridges retrofitted with shape memory alloy restrainers can aid in paving the way toward widespread application of such smart materials in structural applications.

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An efficient and accurate fragility approach for seismic performance assessment of structures

Pang,

Wei,

Wang

et al. 2023

Earthquake Engineering and Resilience

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In seismic risk assessment of bridges, developing fragility function is a fundamental step to characterize the structural vulnerability, which is usually derived based on the relationship between the engineering demand parameter (EDP) and intensity measure (IM). The EDP‐IM relationships are generally developed through three approaches, namely Cloud analysis (Cloud), incremental dynamic analysis (IDA), and multiple strip analysis (MSA). It is known that the Cloud method is computationally efficient while the IDA and MSA can provide the accurate fragility estimates. Thus, the present paper proposes an efficient and accurate fragility (EAF) approach which has similar computational demand as Cloud but keeps the same level of accuracy as IDA or MSA. In this proposed EAF procedure, the nonlinear time‐history responses at the intensifying duration of ground motions were used to develop the EDP‐IM curves. And these EDP‐IM curves are accurate enough to replace the IDA curves in developing fragility curves. To illustrate the efficiency and accuracy of the proposed EAF method, two typical bridges (a two‐span single‐frame bridge and a single‐pylon cable‐stayed bridge) were selected and modeled in OpenSees and employed as case studies. By comparing the fragility estimates of these bridges to IDA and MSA, it is demonstrated that the proposed EAF approach leads to reliable fragility results, while has similar computational time as Cloud.

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Influence of Multidirectional Cable Restrainer on Seismic Fragility of a Curved Bridge

Cited by 20 publications

References 52 publications

Seismic Effectiveness of Multiple Seismic Measures on a Continuous Girder Bridge

Seismic Effectiveness of Multiple Seismic Measures on a Continuous Girder Bridge

Performance-based seismic loss assessment of isolated simply-supported highway bridges retrofitted with different shape memory alloy cable restrainers in a life-cycle context

An efficient and accurate fragility approach for seismic performance assessment of structures

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