Strengthening multiple span simply-supported girder bridges using post-tensioned negative moment connection technique

Wen Wei Wang, Jianguo Dai, Cheng Kui Huang, Qi Hang Bao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)

Abstract

A post-tensioned negative moment connection technique is proposed to strengthen old multiple span simply-supported T-section reinforced concrete (RC) girders. In this technique, old concrete is removed from girder ends and flanges, a diaphragm is placed between the two adjacent girder ends over the interior support and negative moment steel strands are installed in new cast-in-place concrete and post-tensioned to make continuity. A total of six two-span simply-supported T-section RC girders were cast and five of them strengthened using the provision of the proposed post-tensioned negative moment connections. Both laboratory tests and nonlinear finite element (FE) analysis were conducted to investigate the structural performance of the strengthened RC girders. The moment redistribution in the strengthened continuous RC girders was also measured and is discussed. It is shown that the proposed post-tensioned moment connection technique can reliably transfer the negative moment over the support and markedly increase member stiffness and the load-carrying capacity of existing multiple span simply-supported RC girders. The validity of the FE analysis was also demonstrated through comparisons with experimental results.
Original languageEnglish
Pages (from-to)663-673
Number of pages11
JournalEngineering Structures
Volume33
Issue number2
DOIs
Publication statusPublished - 1 Feb 2011

Keywords

  • FE analysis
  • Load-carrying capacity
  • Made continuous
  • Moment connection
  • Post-tension
  • Simply-supported bridge girders
  • Stiffness

ASJC Scopus subject areas

  • Civil and Structural Engineering

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