Response analysis of long-period seismic action in far field to long-span continuous beam bridge with isolated high piers

In order to study the influence of far-field long-period seismic waves on high-pier and long-span continuous beam bridge, taking a high-pier and long-span continuous beam bridge with span arrangement of (95+170+95) m as an example, a numerical analysis model is established based on finite element software. According to the established wave selection criterion, 10 far-field long-period seismic records and 10 ordinary seismic records are selected from the strong earthquake record database. Using nonlinear time history analysis method, the difference of seismic response of long-span continuous beam bridge with isolated high piers under the action of ordinary ground motion and far-field long-period ground motion is studied. The results show that compared with the ordinary ground motion, the seismic response of long-span continuous beam bridge with isolated high piers is obviously increased under the action of long-period ground motion in the far field. When building isolated long-span bridges in areas with great influence of long-period ground motion in the far field, attention should be paid to the adverse effects caused by the frequency spectrum characteristics of ground motion.

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Application research of seismic isolation device in long-span continuous beam bridge

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/439/4/042065 ◽

2018 ◽

Vol 439 ◽

pp. 042065

Author(s):

Fang Chen ◽

Tieyi Zhong ◽

Wei Wang ◽

Xiaoxue Wang ◽

Fan Zhu

Keyword(s):

Seismic Isolation ◽

Continuous Beam ◽

Application Research ◽

Long Span ◽

Continuous Beam Bridge ◽

Isolation Device ◽

Beam Bridge

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

Advances in Bridge Engineering ◽

10.1186/s43251-021-00041-y ◽

2021 ◽

Vol 2 (1) ◽

Author(s):

Man Liao ◽

Bin Wu ◽

Xianzhi Zeng ◽

Kailai Deng

Keyword(s):

Dynamic Analysis ◽

Seismic Response ◽

Vertical Component ◽

Incremental Dynamic Analysis ◽

Continuous Beam ◽

Restoring Force ◽

Long Span ◽

Rubber Bearing ◽

Continuous Beam Bridge ◽

Beam Bridge

AbstractIn 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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Seismic response analysis of high-pier long-span continuous rigid-frame bridges under far-field long-period ground motions

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/638/1/012072 ◽

2021 ◽

Vol 638 (1) ◽

pp. 012072

Author(s):

Wang Yanan ◽

Tang Guangwu ◽

Liu Haiming ◽

Liu Yonghui ◽

Peng Bin

Keyword(s):

Seismic Response ◽

Ground Motions ◽

Response Analysis ◽

Far Field ◽

Seismic Response Analysis ◽

Long Period ◽

Long Span ◽

Rigid Frame ◽

High Pier

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PARAMETER SENSITIVITY ANALYSIS OF ISOLATED BEARINGS OF CONTINUOUS GIRDER BRIDGE UNDER FAR-FIELD LONG PERIOD GROUND MOTION

10.37153/2686-7974-2019-16-489-499 ◽

2019 ◽

Author(s):

Xuehong LI ◽

Xiuli XU ◽

Zhijun LI ◽

Weiguo HUANG ◽

Mengmeng CHENG

Keyword(s):

Sensitivity Analysis ◽

Ground Motion ◽

Parameter Sensitivity ◽

Far Field ◽

Parameter Sensitivity Analysis ◽

Long Period ◽

Continuous Girder Bridge ◽

Girder Bridge ◽

Long Period Ground Motion

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Study on Seismic Response and Countermeasures of Long Span Cable-Stayed Bridge under Long Period Ground Motion

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.71-78.3841 ◽

2011 ◽

Vol 71-78 ◽

pp. 3841-3844

Author(s):

Guo Hui Zhao ◽

Wen Hua Zhang ◽

Jian Hui Zhao

Keyword(s):

Seismic Response ◽

Ground Motion ◽

Ground Motions ◽

Great Influence ◽

Viscous Dampers ◽

Fluid Viscous Dampers ◽

Long Period ◽

Cable Stayed Bridge ◽

Long Span ◽

Long Period Ground Motion

Long period ground motion has great influence on long period structures such as large oil tank, high-rise building and long span bridge. In this paper, a long span cable-stayed bridge is taken as an example to study the seismic response of long period structure under long period ground motions and conventional ground motions by using nonlinear dynamic time history method. It is shown that although the peak acceleration of the long period ground motions are no more than half of conventional ground motions, the displacement and force response of the bridge at key points under long period ground motions are much greater than that of conventional ground motions. Constraint cables and fluid viscous dampers are used to reduce in the influence of long period ground motion of the bridge, and the effects of the two countermeasures are also analyzed in this paper. The results show that constraint cables have unstable effect and even negative effect under long period ground motion. While fluid viscous dampers have stable effect under both long period ground motion and conventional ground motion with proper damping parameters.

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