Extended finite-element analysis of fractures in concrete

In this study an extended finite-element method (X-FEM) that is fully compatible with standard FE program has been formulated based on a virtual node technique. A cohesive crack model that is appropriate for concrete fracture under mixed-mode loading has been integrated into the formulation. The proposed method was implemented into a commercial FE program as a user subroutine, and two benchmark experimental tests were successfully modelled. The numerical robustness and predictive power of the proposed method have been demonstrated by its excellent predictions on arbitrary crack evolution and the associated load-displacement curves. Detailed numerical investigation of the crack wake shielding effects on the fracture loading curves showed that: (a) crack wake shear shielding has little effect on the peak fracture load and its immediate neighbouring softening phase; (b) the initial shear cohesive stiffness has a significant influence on the descending slope of the softening part of the load-CMSD curve; and (c) the shear cohesive strength appears to make the softening phase more stable and to delay the abrupt fracture point.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/17550777
• Authors:
  • FANG, X J
  • FENG, J
  • QINGDA, YANG
• Publication Date: 2008-12

Language

• English

Media Info

• Pagination: 187-97
• Serial:
  • ENGINEERING AND COMPUTATIONAL MECHANICS (PROCEEDINGS OF THE ICE)
  • Volume: 161
  • Issue Number: EM4
  • ISSN: 1755-0777

Subject/Index Terms

• TRT Terms: Concrete; Cracking; Evaluation; Finite element method
• Subject Areas: Planning and Forecasting; I32: Concrete; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 01121349
• Record Type: Publication
• Source Agency: TRL
• Files: ITRD
• Created Date: Feb 5 2009 8:42AM