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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2020  >  20(6): 90-103
DAN De-shan, HAN Lu-lu, JU Fa-xian, DONG Jun. Impact of ground motion incident angles on seismic vulnerability for bridge with thin-walled hollow tall pier[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 90-103. doi: 10.19818/j.cnki.1671-1637.2020.06.008
Citation: DAN De-shan, HAN Lu-lu, JU Fa-xian, DONG Jun. Impact of ground motion incident angles on seismic vulnerability for bridge with thin-walled hollow tall pier[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 90-103. doi: 10.19818/j.cnki.1671-1637.2020.06.008
shu

Impact of ground motion incident angles on seismic vulnerability for bridge with thin-walled hollow tall pier

doi: 10.19818/j.cnki.1671-1637.2020.06.008
  • 1.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    Yunnan Research Institute of Highway Science and Technology, Kunming 650200, Yunnan, Chnia

Funds:

National Key Research and Development Program of China 2016YFC0802202

National Natural Science Foundation of China 51678489

National Natural Science Foundation of China 51978577

Science and Technology Project of Department of Transport of Yunnan Province 2017(A)03

More Information
  • Author Bio:

    SHAN De-shan(1969-), male, professor, PhD, desshan@163.com

  • Received Date: 2020-07-09
  • Publish Date: 2020-06-25
    Abstract
  • A certain 4-span rigid-frame-continuous composite bridge with tall piers in western China was considered as the research object to fully assess the seismic resistance performance of long-span bridge structures with thin-walled hollow tall piers. Combined with the current bridge seismic design code, the incremental dynamic analysis method was adopted to discuss the impact of horizontal ground motion incident angle on the seismic vulnerability of bridge components based on the three-dimensional seismic vulnerability analysis method, and the influence of vertical ground motion was considered. The impact law of ground motion incident angle on the seismic vulnerability of bridge structural system was analyzed in considering the first-order reliability theory. Analysis result indicates that the bending and shearing vulnerability nephograms of the 2# and 3# rigid-frame piers differ significantly from the corresponding nephograms of the 1# and 4# cantilever piers. The bending and shearing seismic vulnerabilities of pier are not only related to the ground motion incident angle but also to the pier structural type. The distributions for the damage probability of bearings with slight, moderate, severe, and complete damage states are similar. The ground motion incident angles for the maximum damage probability are 0 and 180° when the peak ground acceleration is 0.4g. The most unfavorable incident angles for the slight and moderate damage states are 0-180° as the peak ground acceleration increases over 0.6g. The most unfavorable ground motion incident directions for the bearing deformation are mainly the longitudinal and lateral directions of the bridge. It can be seen that the damage probabilities for various damage indices of the various key components differ along with the various intensities and directions for ground motions. The number and ranges for the most unfavorable ground motion incident angles and their relative intervals of the structural system and its components with various damage indices also differ. The seismic demand for the bridge structure can not be properly evaluated by only discussing the seismic vulnerability in the longitudinal and lateral directions of the bridge. The most unfavorable ground motion incident angle and even the seismic resistance performance of long-span bridges with tall piers can be located and evaluated accurately using the proposed three-dimensional seismic vulnerability analysis method.

     

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