Analysis and Design of Concrete Pavements: A New Approach

Westergaard's theory is usually used for the computation of stresses due to single wheel loads with linear temperature gradients in concrete pavements, and the foundation is assumed to be liquid foundation, also termed as Winkler foundation. Wheel loads and temperature stresses are found to be generally correct for interior and edge loading conditions, as validated by finite element method. The algebraic addition of wheel loads and temperature stresses computed using Westergaard's and Bradbury's approach does not give correct values of stresses because superposition principle is not valid in such cases, as there is loss of contact between the concrete slab and the foundation during curling. IRC:58-2002 design charts are developed using HTRIGID program, which is based on Westergaard's basic approach. However, IRC:58-2011 and IRC:58-2015 design charts are developed using DOS-based KGPSLAB software, which uses finite element analysis with the assumption that the dry lean concrete (DLC) acts as a Winkler foundation (WF). WF implies zero shear strength for the DLC, which is not valid, and stress computation may not be correct. The present work presents a new analytical approach for the analysis of stresses in concrete pavement resting on DLC with a bond breaking layer of the plastic sheet at the interface, a condition very close to a real condition. The two layers pavement rests on a Winkler foundation. Stresses are computed both in pavement slab and DLC by three-dimensional finite element using ANSYS software. The stress values computed as per the new approach will be closer to the field condition. The analysis indicates that the stresses in pavement quality concrete (PQC) are not vastly different from those reported in IRC:58-2015 for bottom-up cracking for a number of cases, but stresses in DLC can also be computed to examine the safety of the support.

  • Availability:
  • Supplemental Notes:
    • Abstract reprinted with permission from the publisher.
  • Authors:
    • Survateja, Swarna
    • Reddy, M A
    • Pandey, B B
  • Publication Date: 2017-12

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 37-42
  • Serial:
    • Indian Highways
    • Volume: 45
    • Issue Number: 12
    • Publisher: Indian Roads Congress
    • ISSN: 0376-7256

Subject/Index Terms

Filing Info

  • Accession Number: 01685594
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 5 2018 11:44AM