Energy dissipating restrainers for highway bridges

Kim, J.-M.; Feng, Maria Q.; Shinozuka, Masanobu

doi:10.1016/s0267-7261(99)00030-5

Cited by 35 publications

(13 citation statements)

References 1 publication

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“…Togaonkar and Jangid [7] evaluated the performance of three span continuous deck bridges using linear and non-linear model of elastomeric bearing to show that these bearings are quite effective in reducing the seismic response of the bridges. Kim et al [8] studied the response of highway bridges with energy dissipating restrainers. Hwang and Sheng [9] evaluated specified effective stiffness and equivalent damping ratio for an equivalent elastic system of isolated bridges and proposed empirical formulae for calculations of the equivalent period shift and equivalent damping ratio of equivalent system.…”

Section: Introductionmentioning

confidence: 99%

Seismic response of isolated bridges with soil–structure interaction

Tongaonkar

Jangid

2003

Soil Dynamics and Earthquake Engineering

116

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The modern transportation facilities demand that the bridges are to be constructed across the gorges that are located in seismically active areas and at the same time the site conditions compel the engineers to rest the pier foundation on soil. The purpose of this study is to assess the effects of soil -structure interaction (SSI) on the peak responses of three-span continuous deck bridge seismically isolated by the elastomeric bearings. The emphasis has been placed on gauging the significance of physical parameters that affect the response of the system and identify the circumstances under which it is necessary to include the SSI effects in the design of seismically isolated bridges. The soil surrounding the foundation of pier is modelled by frequency independent coefficients and the complete dynamic analysis is carried out in time domain using complex modal analysis method. In order to quantify the effects of SSI, the peak responses of isolated and non-isolated bridge (i.e. bridge without isolation device) are compared with the corresponding bridge ignoring these effects. A parametric study is also conducted to investigate the effects of soil flexibility and bearing parameters (such as stiffness and damping) on the response of isolated bridge system. It is observed that the soil surrounding the pier has significant effects on the response of the isolated bridges and under certain circumstances the bearing displacements at abutment locations may be underestimated if the SSI effects are not considered in the response analysis of the system.

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Section: Introductionmentioning

confidence: 99%

Seismic response of isolated bridges with soil–structure interaction

Tongaonkar

Jangid

2003

Soil Dynamics and Earthquake Engineering

116

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“…(3) When the nonlinearity of the restraining devices is considered (model 4), the seismic response of the bottom section of the movable piers is smaller or similar with that in the case when the elasticity of restraining devices is considered; the seismic response of the bottom section of the fixed piers is slightly larger than that in the case when the elasticity of restraining devices is considered due to the fact that the restraining devices are in nonlinear stage which limits the bearing of seismic force by movable supports. The restrainers should be designed energy intensive to protect the movable pier from being destroyed by the violet pounding force, so model 4 was suggested in practice [14][15][16]. The bump rubber can be also used to decrease the pounding force.…”

Section: Comparison Of Calculated Moment and Curvature Of The Bottom mentioning

confidence: 99%

Effect of nonlinearity of restrainer and supports on the elasto-plastic seismic response of continuous girder bridge

Wang¹,

Zhu²,

Chen³

2014

Frattura Ed Integrità Strutturale

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ABSTRACT. During an earthquake, the nonlinearity of the bridge structure mainly occurs at the supports, bridge piers and restrainers. When entering nonlinear stage, members of the bridge structure affect the elasto-plastic seismic response of the whole structure to a certain extent; for multi-span continuous bridges, longitudinal restrainers can be installed on the movable piers to optimise the distribution of seismic force and enable the movable piers to bear a certain amount of seismic effect. In order to evaluate the effect of nonlinearity of restrainer and supports on the elasto-plastic seismic response of continuous girder bridge, analytical models of continuous girder bridge structure considering the nonlinearity of movable supports, restrainers and bridge piers were built and the nonlinear time history analysis was conducted to evaluate the effect of nonlinearity of restraining devices and supports on the elasto-plastic seismic response of continuous girder bridge. Relevant structural measures and recommendation were made to reduce the seismic response of the fixed piers of the continuous girder bridge.

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“…Some of the earlier research on elastic and elastic-gap stiffening systems include the study of the base-isolated beams bumping against stops with elastic force-displacement relationships [9] where the behavior of such systems was investigated as a function of gap size and stop stiffness, behavior of piping systems with elastic-plastic-gap supports [10], dynamics of seismic impacts on base-isolated structures [11], inelastic seismic response of stiffening systems [12] and investigation of the benefits of energy-dissipating restrainers for highway bridges [13] .…”

Section: Earlier Applications Of Elastic/elastic-gap Stiffening Devicesmentioning

confidence: 99%

Performance of seismic‐isolated bridges with and without elastic‐gap devices in near‐fault zones

Dicleli

2008

Earthq Engng Struct Dyn

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SUMMARYIn this paper, the efficiency of providing elastic-gap devices (EGDs) to improve the performance of seismic-isolated bridges (SIBs) in near-fault (NF) zones is investigated. The device is primarily made of an assembly of circular rubber bearings and steel plates to provide additional elastic stiffness to the SIB upon closure of a gap. The EDG is intended to function at two performance levels under service and maximum considered design level (MCDL) NF earthquakes to reduce isolator displacements while keeping the substructure forces at reasonable levels. A parametric study, involving more than 500 nonlinear time history analyses of realistic and simplified structural models of typical SIBs, is conducted using simulated and actual NF ground motions to investigate the applicability of the proposed solution. It is found that providing EGD is beneficial for reducing the isolator displacements to manageable ranges for SIBs subjected to MCDL NF ground motions regardless of the distance from the fault and characteristics of the isolator. It is also found that providing EGD resulted in an improved performance of the isolators in terms of the reduction of heat generated by the isolators. Further analyses conducted using a realistic structural model of an existing bridge and five NF earthquakes confirmed that EGD may be used to reduce the displacement of the isolators while keeping the substructure base shear forces at reasonable ranges for SIBs located in NF zones.

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Energy dissipating restrainers for highway bridges

Cited by 35 publications

References 1 publication

Seismic response of isolated bridges with soil–structure interaction

Seismic response of isolated bridges with soil–structure interaction

Effect of nonlinearity of restrainer and supports on the elasto-plastic seismic response of continuous girder bridge

Performance of seismic‐isolated bridges with and without elastic‐gap devices in near‐fault zones

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