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Advances in Concrete Construction
  Volume 10, Number 1, July 2020, pages 49-59
open access

Quasi-static test of the precast-concrete pile foundation for railway bridge construction
Xiyin Zhang, Xingchong Chen, Yi Wang, Mingbo Ding, Jinhua Lu and Huajun Ma

    Precast concrete elements in accelerated bridge construction (ABC) extends from superstructure to substructure, precast pile foundation has proven a benefit for regions with fragile ecological environment and adverse geological condition. There is still a lack of knowledge of the seismic behavior and performance of the precast pile foundation. In this study, a 1/8 scaled model of precast pile foundation with elevated cap is fabricated for quasi-static test. The failure mechanism and responses of the precast pile-soil interaction system are analyzed. It is shown that damage occurs primarily in precast pile-soil interaction system and the bridge pier keeps elastic state because of its relatively large cross-section designed for railways. The vulnerable part of the precast pile with elevated cap is located at the embedded section, but no plastic hinge forms along the pile depth under cyclic loading. Hysteretic curves show no significant strength degradation but obvious stiffness degradation throughout the loading process. The energy dissipation capacity of the precast pile-soil interaction system is discussed by using index of the equivalent viscous damping ratio. It can be found that the energy dissipation capacity decreases with the increase of loading displacement due to the unyielding pile reinforcements and potential pile uplift. It is expected to promote the use of precast pile foundation in accelerated bridge construction (ABC) of railways designed in seismic regions.
Key Words
    railway bridge construction; precast concrete pile foundation; elevated pile cap; quasi-static test; seismic performance
Xiyin Zhang, Xingchong Chen, Yi Wang, Mingbo Ding, Jinhua Lu and Huajun Ma: School of Civil Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Lanzhou, Gansu, 730070, China

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