Parameters in Bridge Restrainer Design for Seismic Retrofit

Saiidi, M. Saiid; Maragakis, Emmanuel M.; Feng, Shumin

doi:10.1061/(asce)0733-9445(1996)122:1(61)

Cited by 44 publications

(12 citation statements)

References 1 publication

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“…The fixed supports at individual vibration unit are modeled by springs which have large stiffness and are denoted by K A1,1 , K 2,5 , K 6,9 . Also it is assumed that the fixed supports have no damage during seismic excitations.…”

Section: Bearingmentioning

confidence: 99%

“…Saiidi et al [6] have performed parametric study, which is based on nonlinear response of a nine-span bridge subjected to several earthquake records, to determine the effects of the crosssectional area of restrainers and the restrainer clearance length and have recommended that the design should be based on cases with and without restrainer clearance length to encompass all the critical forces, stresses, and displacements. Trochalakis et al [7] conducted 216 nonlinear time history analyses for various frames, abutments, and restrainer properties and showed that maximum relative displacements were sensitive to the stiffness of adjacent frames, the frame's effective periods, and the restrainer properties.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the restrainer upon bridge motions under seismic excitations

Won

Mha

Cho

et al. 2008

Engineering Structures

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Section: Bearingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of the restrainer upon bridge motions under seismic excitations

Won

Mha

Cho

et al. 2008

Engineering Structures

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“…However, as one of the important components of bridge, the aseismic behavior of expansion joints have long been neglected by researchers (Saiidi, 1996;Kawashima, 2000;Ruangrassamee, 2001;Zanardo, 2001;DesRoches, 2002) and the past papers have given importance to the enhancement of durability, cold resistance and noise-resistance of expansion joints. For example, Ancich et al studied the dynamic anomalies of the modular bridge expansion joints (Ancich, et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of Cable-sliding Modular Expansion Joints Subject to Near-fault Ground Motion

Gao

Yuan

Cao

et al. 2015

Lat. Am. j. solids struct.

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According to the research fruits of the diverse damages of bridge in the past, bearings' invalidation is the main reason of the damage of isolated bridges and causes oversized relative displacements between pier and girder. Eventually, it may lead to severe collision of superstructure. It is extremely dangerous when near-fault motion occurs, because it has obvious velocity pulse effect and increases the risk of colliding between girders.Aiming at this problem, this paper puts forward a device named cable-sliding modular expansion joints (CMEJs) that can control the relative displacement and avoid collision. The working principle and mechanical model are described, and then based on a triple continuous seismic isolation bridge which has different heights of piers, a 3D model with or without CMEJs is established. The responses of continuous beam bridges using the CMEJs are comprehensively inspected under the consideration of the velocity pulse effect, and then a real simulation of limit performance of CMEJs is made, focused on CMEJs' restraining effect.The calculation shows that velocity pulse effect would magnify the seismic response of isolation bridges. In addition, the device can well control the displacement and prevent collisions. And the isolation technology combined with CMEJs can be more effective to play their respective roles. The advantage in controlling displacement is obvious. Keywords near-fault ground motion, the effect in limiting relative displacement; cable-sliding modular expansion joints (CMEJs), seismic isolation bridge, velocity pulse effect

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“…After the occurrence of a severe earthquake, important bridges treated as main lifelines for emergent transportation are expected to withstand and be able to serve their functions. To meet the requirement, many researchers have so far developed procedures to prevent the unseating of bridge decks [2][3][4][5]. An approach is to provide an adequate seat width on a pier to support a deck.…”

Section: Introductionmentioning

confidence: 99%

Relative displacement response spectra with pounding effect

Ruangrassamee

Kawashima

2001

Earthq Engng Struct Dyn

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SUMMARYTo avoid unseating of a deck, an adequate seat length must be provided. The seat length is generally determined from a maximum relative displacement between two bridge segments. Under strong ground excitation, pounding between two decks may occur at a joint. The pounding will affect responses of two bridge segments. This research was conducted to investigate the effect of pounding on the relative displacement between two adjacent bridge segments. A simplified analytical model was developed for such a purpose. To take into account the pounding, the laws of conservation of momentum and energy were applied. The analytical results were represented in the form of a relative displacement response spectrum with pounding effect. It is found that due to the pounding the relative displacement can be amplified, resulting in the requirement of a longer seat length to support a deck.

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Parameters in Bridge Restrainer Design for Seismic Retrofit

Cited by 44 publications

References 1 publication

Effects of the restrainer upon bridge motions under seismic excitations

Effects of the restrainer upon bridge motions under seismic excitations

Seismic Performance of Cable-sliding Modular Expansion Joints Subject to Near-fault Ground Motion

Relative displacement response spectra with pounding effect

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