Seismic response of a continuous bridge with bearing protection devices

Ghosh, Goutam; Singh, Yogendra; Thakkar, S. K.

doi:10.1016/j.engstruct.2010.12.033

Cited by 34 publications

(7 citation statements)

References 21 publications

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“…The latter research concluded that elastomeric bearings can undertake shearing, compression and rotations, but recommend that the isolators should not be subjected tosignificant tensile stresses. For design earthquakes, the influence that the earthquakes have on the mechanical properties of bearings (shear stiffness and damping ratio) will be relatively small, however stronger seismic motions and larger displacements change the bearing properties dramatically [27] [39][40]. Reliance of current design practice is based on the fact that elastomeric bearings are subjected to significant compressive loads due to the self-weight of the supported structure, thus the possibility of tensile loading is adequately low.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the response of steel-laminated elastomeric bearings subjected to variable axial loads and development of local tensile stresses

Kalfas¹,

Mitoulis

Katakalos

2017

Engineering Structures

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Section: Introductionmentioning

confidence: 99%

Numerical study on the response of steel-laminated elastomeric bearings subjected to variable axial loads and development of local tensile stresses

Kalfas¹,

Mitoulis

Katakalos

2017

Engineering Structures

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“…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]. Another mitigation measure for the pounding of adjacent structures would be the prevention of impact incidents by providing sufficient gaps.…”

Section: Introductionmentioning

confidence: 99%

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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“…Bi and Hao (2013) used a detailed 3D model of an isolated bridge and reported that bridge girder could dislocate from the bearing and the dislocated girder could pound against rubber bearing leading to further damages. Only limited studies have focused on the bearing protection devices (Choi et al, 2005; Ghosh et al, 2011; Ozbulut and Hurlebaus, 2011; Wilde et al, 2000). It should be noted that these studies did not consider pounding between the adjacent bridge components that could amplify/reduce the bridge displacement.…”

Section: Introductionmentioning

confidence: 99%

On the effectiveness of rotational friction hinge damper to control responses of multi-span simply supported bridge to non-uniform ground motions

Shrestha

Hao

Ibrahim³

et al. 2016

Advances in Structural Engineering

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Base isolation techniques have been extensively used to improve the seismic performance of the bridge structures. The decoupling of the bridge decks from the piers and abutments using rubber isolator could result in significant reduction in seismic forces transmitted to the bridge substructures. However, the isolation devices could also increase the deck displacement and thus enhance the possibility of pounding and unseating damage of bridge decks. Moreover, previous investigations have shown that pounding and unseating damages on isolated bridges exacerbate due to the spatial variation in earthquake ground motions. Recent earthquakes revealed that isolation bearing could also be damaged due to the excessive movements of decks during large earthquake events. This study proposes the use of rotational friction hinge dampers to mitigate the damages that could be induced by large displacement of bridge decks, particularly focusing on pounding and unseating damages and bearing damages. The device is capable of providing large hysteretic damping and the cost of installing the devices is relatively economical. This article presents numerical investigations on the effectiveness of these devices on a typical Nepalese simply supported bridge subjected to spatially varying ground motions. The results indicate that rotational friction hinge dampers are very effective in mitigating the relative displacement and pounding force, as well as controlling the bearing deformation and pier drift. It is also revealed that the effectiveness of the device is not significantly affected by small changes in the slip forces; thus, small variations in the optimum slip forces during the lifetime of the bridge do not warrant any adjustment or replacement of the device.

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Seismic response of a continuous bridge with bearing protection devices

Cited by 34 publications

References 21 publications

Numerical study on the response of steel-laminated elastomeric bearings subjected to variable axial loads and development of local tensile stresses

Numerical study on the response of steel-laminated elastomeric bearings subjected to variable axial loads and development of local tensile stresses

Seismic Effectiveness of Multiple Seismic Measures on a Continuous Girder Bridge

On the effectiveness of rotational friction hinge damper to control responses of multi-span simply supported bridge to non-uniform ground motions

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