Seismic responses of CRTSⅡ track system on bridge under complex geography conditions

YAN Bin; HUANG Jie; LIU Shi; LOU Ping

doi:10.19818/j.cnki.1671-1637.2018.01.004

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YAN Bin, HUANG Jie, LIU Shi, LOU Ping. Seismic responses of CRTSⅡ track system on bridge under complex geography conditions[J]. Journal of Traffic and Transportation Engineering, 2018, 18(1): 42-50. doi: 10.19818/j.cnki.1671-1637.2018.01.004

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YAN Bin, HUANG Jie, LIU Shi, LOU Ping. Seismic responses of CRTSⅡ track system on bridge under complex geography conditions[J]. Journal of Traffic and Transportation Engineering, 2018, 18(1): 42-50. doi: 10.19818/j.cnki.1671-1637.2018.01.004

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Seismic responses of CRTSⅡ track system on bridge under complex geography conditions

doi: 10.19818/j.cnki.1671-1637.2018.01.004

YAN Bin^{1, 2
,},
HUANG Jie¹,
LIU Shi³,
LOU Ping^{1, 2
,
,}

1.
School of Civil Engineering, Central South University, Changsha 410075, Hunan, China
2.
National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, Hunan, China
3.
China Coal Xi'an Design Engineering Co., Ltd., Xi'an 710054, Shaanxi, China

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Author Bio:
YAN Bin(1984-), male, associate professor, PhD, binyan@csu, edu.cn
Corresponding author: LOU Ping (1968-), male, professor, PhD, pinglou@csu, edu, cn
Received Date: 2017-09-20
Publish Date: 2018-02-25

Abstract

Abstract

To study the effect of complex geographies on the seismic responses of CRTS II track system on bridge, the 16-32 msimply supported bridge on the Shanghai-Kunming High-Speed Railway was taken as an example, the nonlinear dynamics simulation model of multispan simply supported bridge and double CRTS Ⅱ track system was established based on considering rail, fastener, track plate, mortar layer, base plate, sliding layer, bridge, consolidation mechanism, terminal spine, check block and other parts, and the longitudinal force distribution characteristicsof CRTS II track system on the bridge were studied.Four kinds of typical geography conditions were set to study the seismic response rules of CRTS Ⅱ track system on the bridge.Research result shows that compared with the non-longitudinal continuous track structures, the maximum track stress of CRTS Ⅱtrack structure on the bridge is relatively smaller and about 138.8 MPa, and its stress envelope curve is antisymmetric and more smooth.Track plate and base plate together bear longitudinal forces, and their maximum values are near the bridge abutment and are25.2 MPa and 27.1 MPa, respectively, which can result in cracking during the earthquake.The terminal spine bears huge longitudinal force that can reach 14-20 MN.During earthquake, a greatly relative displacement more than 24 mm occurs between base plate and bridge deck, which has the effect of seismic isolation and energy consumption.The geography conditions have 30%influence on the longitudinal stresses of rail, track plate and base plate, while have greater influence on the shear force at the pier bottom.The shear force at the pier bottom increases 4 times where the terrain (pier height) mutates.The lateral deformation of sliding layer near the abutment is larger and can reach to 2.7 mm.With the increase of pier height, the longitudinal, lateral and vertical deformations of fastener and sliding layer increase.The sliding layer generally has larger vertical deformation that can reach 43.5 mm near the abutment.In the earthquake, there is frequent collision between check block and base plate, and the collision force near the abutment is more than 38 MPa that can cause the damage of check block.
- railway engineering,
- simply supported bridge,
- complex geography,
- ballastless track,
- seismic response

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References(26)

References

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Seismic responses of CRTSⅡ track system on bridge under complex geography conditions

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