Ageing in shallow underground RC culverts and tunnels

M. Kunieda, X. Zhu, Y. Nakajima, S. Tanabe, K. Maekawa*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

1 Citation (Scopus)

Abstract

The safety and serviceability of the concrete structures in service are probably affected by long-term ageing. Creep deflection of concrete, which depends particularly on the loading history and water content, as a phenomenon of ageing, has been proved to be an unavoidable problem. This paper aims to investigate the mechanism of the long-term excessive deformation of shallow RC box culverts, which have members of comparatively smaller thickness. The authors mainly focus on two points: the internal moisture state of concrete members and the increase in the vertical earth pressure acting on culverts caused by both uneven settlement of the foundation and RC structural deformation as a coupled action. To examine these effects, sensitivity analyses using multi-scale analysis and site investigation for deformational modes and steel strain are conducted. It is concluded that long-term ageing of shallow underground RC culverts and tunnels may be attributed to the synergistic effects accompanying risky delayed shear deformation owing to redistributed vertical soil pressure accelerated by the structural deformation associated with shrinkage and creep of concrete.

Original languageEnglish
Title of host publicationThe Ageing of Materials and Structures
Subtitle of host publicationTowards Scientific Solutions for the Ageing of Our Assets
Pages81-94
Number of pages14
ISBN (Electronic)9783319701943
DOIs
Publication statusPublished - 23 Nov 2017
MoE publication typeA3 Part of a book or another research book

Keywords

  • Aging
  • Delayed shear deformation
  • Differential settlement
  • Internal moisture state
  • Long-term excessive deformation
  • Underground RC culverts

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