Influence of Intermediate Principal Stress on the Bearing Capacity of Strip and Circular Footings

Studies of the bearing capacity of footings usually do not take into account the effect of the intermediate principal stress. In practice, the intermediate principal stress has certain influences on the strength of geomaterials (e.g., rock and soil) or concrete. This paper focuses on a numerical study using the finite-difference code Fast Lagrangian Analysis of Continua (FLAC) and the united strength theory (UST) to investigate the influence of the intermediate principal stress on the bearing capacity of strip and circular footings. A series of numerical solutions are presented to determine the vertical bearing capacity of strip and circular footings using an elastic–perfectly plastic constitutive model following UST and the associative flow rule. First, the bearing capacity of flexible and strip footings according to UST and other criteria are compared. Second, three bearing capacity factors (Nc, Nq, and Nγ) are evaluated for strip and circular footings subjected to centered vertical loads with rough interfaces. A certain influence of the intermediate principal stress on the bearing capacity of strip and circular footings was detected based on UST and the associative flow rule. It was found that the intermediate principal stress has more influence on the bearing capacity of a strip footing than the bearing capacity of a circular footing. It was also found that the bearing capacity factor Nγ is more significantly influenced by the intermediate principal stress than are the factors Nc and Nq. The influence of the intermediate principal stress on three bearing capacity factors for strip and circular footings analyzed in this paper has been obtained using the elastic–perfectly plastic constitutive model based on UST.

• Record URL:
  https://doi.org/10.1061/(ASCE)EM.1943-7889.0000762
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339399
• Supplemental Notes:
  • © 2014 American Society of Civil Engineers.
• Authors:
  • Ma, Zong-Yuan
  • Liao, Hong-Jian
  • Dang, Fa-Ning
• Publication Date: 2014-7

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 04014041
• Serial:
  • Journal of Engineering Mechanics
  • Volume: 140
  • Issue Number: 7
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9399
  • EISSN: 1943-7889
  • Serial URL: http://ascelibrary.org/journal/jenmdt

Subject/Index Terms

• TRT Terms: Bearing capacity; Footings; Strength of materials; Stresses; Strip footings; Vertical supports
• Identifier Terms: Fast Langrangian Analysis of Continua
• Subject Areas: Bridges and other structures; Highways; Materials; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01515015
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Feb 21 2014 3:16PM