Numerical Study on Shear Resisting Mechanism for Corroded RC Box Culverts

鉄筋腐食が生じたRCボックスカルバートのせん断耐荷特性に関する解析的評価

This paper discusses the effects of reinforcing steel corrosion on the shear resisting mechanism of RC (reinforced concrete) box culverts and the applicability of the material degradation model in a finite element method. First, in FEM (finite element method) analyses, loss of reinforcement section area and initial tension strain due to reinforcement corrosion, and deteriorated bond characteristics between reinforcement and concrete, were considered. Second, cyclic loading tests using full-scale corroded specimens were numerically analyzed. The analyzed crack patterns and load-displacement relationships up to the maximum load were observed to be in close agreement with the experiment results within the average corrosion ratio of 10% of primary reinforcement. The fact that corrosion cracks can importantly affect the progression of shear cracks and shear strength of RC beams was also found. On the other hand, we established that RC box culverts being statically indeterminate structures, sectional forces are redistributed after cracking damage, and local material deterioration has a minor effect on shear capacity. Furthermore, a parametric study was carried out for corroded RC box culverts using parameters such as size, steel corrosion location, and corrosion level.本研究では，鉄筋腐食に伴う材料劣化を考慮した材料非線形解析に基づいて，鉄筋腐食がRCボックスカルバートのせん断耐荷特性に与える影響を評価した。RCボックスカルバートは，不静定構造で荷重が再分配されるため，局所的な材料劣化により荷重が増加する効果も低下する効果も受けにくいものの，せん断ひび割れの進展に及ぼす腐食ひび割れの影響が大きい場合には，耐荷力よりも変形性能の低下が相対的に大きくなり，せん断耐荷挙動を再現するためには，腐食膨張の効果を適切にモデル化する必要があることなどを明らかにした。また，構造物全体としての解析を行うことで，耐荷特性に及ぼす鉄筋腐食の影響は小さくなり，合理的な評価が可能であることも示した。

• Record URL:
  • https://doi.org/10.3151/crt.24.161
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=Numerical+Study+on+Shear+Resisting+Mechanism+for+Corroded+RC+Box+Culverts&author=T.+Matsuo&author=T.+Matsumura&author=A.+Iwamori&publication_year=2013
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/13404733
• Authors:
  • Matsuo, Toyofumi
  • Matsumura, Takuro
  • Iwamori, Akiyuki
• Publication Date: 2013

Language

• English
• Japanese

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: pp 161-171
• Serial:
  • Concrete Research and Technology
  • Volume: 24
  • Issue Number: 3
  • Publisher: Japan Concrete Institute
  • ISSN: 1340-4733
  • EISSN: 2186-2745
  • Serial URL: https://www.jstage.jst.go.jp/browse/crt/-char/en
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Box culverts; Corrosion; Finite element method; Load tests; Numerical analysis; Reinforced concrete; Repeated loads; Shear strength
• Subject Areas: Bridges and other structures; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01515422
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Feb 24 2014 8:42AM