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Pseudo-static Test on Mechanic Behavior of Pile with Pre-Hole filled by Foam in IABs

 Pseudo-static Test on Mechanic Behavior of Pile with Pre-Hole filled by Foam in IABs
Author(s): , , , ORCID,
Presented at IABSE Congress: The Evolving Metropolis, New York, NY, USA, 4-6 September 2019, published in , pp. 2038-2042
DOI: 10.2749/newyork.2019.2038
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Comparing with the conventional jointed bridges, integral abutment bridges (IABs) have not the typical durability problems of expansion joints and bearings and could have better seismic performance...
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Bibliographic Details

Author(s): (College of Civil Engineering, Fuzhou University)
(College of Civil Engineering, Fuzhou University)
(College of Civil Engineering, Fuzhou University)
ORCID (College of Civil Engineering, Fuzhou University)
(College of Civil Engineering, Fuzhou University)
ORCID (Department of Architecture, Roma Tre University)
Medium: conference paper
Language(s): English
Conference: IABSE Congress: The Evolving Metropolis, New York, NY, USA, 4-6 September 2019
Published in:
Page(s): 2038-2042 Total no. of pages: 5
Page(s): 2038-2042
Total no. of pages: 5
DOI: 10.2749/newyork.2019.2038
Abstract:

Comparing with the conventional jointed bridges, integral abutment bridges (IABs) have not the typical durability problems of expansion joints and bearings and could have better seismic performance due to the high redundancy and integrity. The concrete piles supporting the abutments are often considered as the most vulnerable component in IABs under longitudinal deformation of superstructure caused by temperature variation and seismic load. The pre‐hole method could be adopted to absorb the longitudinal deformation transferred from superstructure to the piles. Therefore, how to improve the energy dissipation of concrete piles to reduce the influence of seismic load is the key issue in IABs. In this paper, a technology based on piles with pre‐holes filled by damping material (called pre‐hole isolation pile) is proposed to improve the seismic response of IABs. The piles supporting the abutments of one real integral abutment bridge were chosen as case study. Pseudo‐static tests of two model piles with the scaled factor of 1/12.5 considering soil‐pile interaction (SPI) were performed. Foam was chosen as damping material. It could be found that compared with conventional piles, the hysteresis curve and the equivalent viscous damping ratio of pre‐hole isolation pile considering SPI was fuller and larger. According to the obtained results, the pre‐hole filled with foam technology could improve the energy dissipation of the concrete piles in integral abutment bridges and their seismic performance.

Keywords:
failure mode foam integral abutment bridge pre‐hole isolation pile soil‐pile interaction pseudo‐static test hysteresis curve equivalent viscous damping ratio