Seismic Response Evalution Considering Seismically Isolated Bridges Using Bi-Linear Double Target Model

Mazda, Taiji; Ohtori, Yasuki; Uno, Yoshifumi; Kaneko, Kazuhiro; Tokumaru, Kou; Naito, Nobuyuki

doi:10.2208/jscejseee.72.i_993

Cited by 2 publications

(1 citation statement)

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“…equivalent linear model, bi-linear model, modificatory bi-linear model and Bouc-Wen model et al (MHURDPPC 2018;Bouc 1967;Wen 1976;Park et al 1986). The classical bi-linear model was one of the most commonly used models in bridge engineering owing to its simplicity and efficiency (Wei et al 2018;Mazda et al 2016). In the bi-linear mechanical model, yielding force was assumed to be the product of its gravity load and the frictional coefficient at the contact interface.…”

Section: Introductionmentioning

confidence: 99%

Incremental dynamic analysis of the long-span continuous beam bridge considering the fluctuating frictional force of rubber bearing

Liao

Zeng

et al. 2021

ABEN

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In the seismic design of long-span bridges, the classic bi-linear model was used to simulate the frictional restoring force of the rubber bearings. However, in actual earthquake, the rubber bearing suffered fluctuating axial pressure in earthquake, even separated from the beam when vertical component of the earthquake was too strong. Employing the bi-linear model for the bearing may incorrectly estimate the seismic response of the bearings, as well as the whole bridge. This paper developed a nonlinear frictional bearing model, which can consider the variation of the frictional restoring force in the bearings, even the separation with the beam in vertical directions. A typical continuous beam bridge was modeled in ABAQUS, and incremental dynamic analysis was conducted for the quantitative comparison of the seismic responses using different bearing models. The intensity measure was selected as the ratio of the peak ground acceleration (PGA) in the vertical direction to the PGA in the horizontal direction. The analysis results indicated that the different bearing model led to the significant different seismic response for the bearings and piers, even the vertical component was small. The bi-linear bearing model would underestimate the seismic demand of the bearing and piers.

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