Stress-Averaged Strain Model for Confined High-Strength Concrete

Damage is usually concentrated in a narrow region when a concrete structure fails. The localization phenomenon of the damage influence the structural behavior. In order to assess the structural behavior accurately, the fracture zone and localization behavior have to be captured. In this research, a series of compressive loading tests of reinforced concrete columns were conducted to evaluate the localization phenomenon in confined concrete and the effects of size and geometry of specimens with concrete compressive strength ranging from 42.6 to 120 MPa (6.18 to 17.4 ksi). The experimental results show that in columns with sections ranging from 200 to 500 mm (7.88 to 19.7 in.), the length of the compressive fracture zone increases with the cross section dimension. Post-peak compressive fracture energies are independent of cross section dimension and column height, provided that the columns have the same concrete compressive strength and lateral confining pressure. A formalized stress-averaged strain model for confined concrete has been developed by using the compressive fracture energy. Regardless of gauge length, cross section dimension, and concrete strength, the proposed model provides good agreement with the test results. This model is applicable to concrete columns with up to 130 MPa compressive strength and transverse reinforcement with up to 1450 MPa.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846957
• Authors:
  • Akiyama, Mitsuyoshi
  • Suzuki, Motoyuki
  • Frangopol, Dan M
• Publication Date: 2010-3

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 179-188
• Serial:
  • ACI Structural Journal
  • Volume: 107
  • Issue Number: 2
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-3241
  • Serial URL: http://www.concrete.org/PUBS/JOURNALS/SJHOME.ASP

Subject/Index Terms

• TRT Terms: Columns; Confined concrete; Deformation curve; Geometry; High strength concrete; Size; Structural analysis
• Uncontrolled Terms: Compressive loads
• Subject Areas: Bridges and other structures; Design; Highways; I20: Design and Planning of Transport Infrastructure;

Filing Info

• Accession Number: 01155755
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 30 2010 8:34AM